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Author Topic: CB750K4 - new updates 07/16/2019 - carb issues solved -air screws!  (Read 30064 times)

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Offline andy750

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Re: CB750K4 - new updates 05/02/2015 - new custom seat
« Reply #150 on: May 16, 2015, 07:04:43 pm »
Yes that's correct on the bogs
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline Restoration Fan

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Re: CB750K4 - new updates 05/02/2015 - new custom seat
« Reply #151 on: May 17, 2015, 06:33:39 am »
Cool photos of the trip, Andy.  Those were 3 beautiful Hondas there!

I really dig the paint job on your K8 tank. I have a spare tank for my 78K and have been trying to come up with something interesting to do with it.  I like the way you took it and made it appear like the earlier K model tanks by using the black. 
Ron

Stella - Logan's Senior Project    78 750K http://forums.sohc4.net/index.php?topic=141761.0

Logan's Reward - CB500 and CB550 Cafes    http://forums.sohc4.net/index.php/topic,147787.0.html

Offline MRieck

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Re: CB750K4 - new updates 05/02/2015 - new custom seat
« Reply #152 on: May 17, 2015, 02:10:28 pm »
How come Anders isn't riding his bike? ;D That 78 tank fills out your bike....it looks beefier....much better looking.
Owner of the "Million Dollar CB"

Offline andy750

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Re: CB750K4 - new updates 05/02/2015 - new custom seat
« Reply #153 on: May 17, 2015, 06:34:22 pm »
Oh Anders was riding his 78 no doubt about that. You are right Mike about it looking beefier - I think the paint job has got a lot to do with that. Its been 6 years since I aquired the tank and then spent that time getting it painted and getting the seat made...clearly I wasnt in  a hurry  8). Couldnt be happier with how it turned out. Hope all is well Mike!

cheers
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline SoyBoySigh

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Re: CB750K4 - new updates 05/02/2015 - new custom seat
« Reply #154 on: January 18, 2017, 05:16:07 pm »
BUMP - for fantasy-ride purposes if nothing else.

Check out the pics of the 'K2 on the Swiss Alps. YUMMY.

I hope to find some pics like that from MY local roads, up here in the Canadian Rocky Mountains. I've been on very similar roads in & around Waterton National Park, which seem more like a skateboard park than a road. Did 'em on my '82 CB750F back in the year zero, with my honey on the back otherwise I might've gotten a bit carried away. Still, a fantastic trip. NEXT time 'round, I hope to accomplish some stop-&-go cinematic action, zipping up & down the length of the thing with spotters and multiple photographers. Maybe an ambulance. Ha-ha. But yeah, with some help, maybe just a tripod even, I wanna get some proper shots of the twisties - "RED ROCK CANYON ROAD" is the name of the place. Plenty of similar stuff, but harder to photograph in their entirety due to the proliferation of evergreen trees.

One would think that pass in the Alps - what's it called again? Would be the site of some special motorcycling EVENT of some sort. Perhaps, as a part of an old's-cool GIRO D'ITALIA, with those 125cc MV Agusta & Ducati singles, the big leather pillow atop the tank, properly starved & dehydrated jockeys aboard 'em, the motorcycle equivalent of those "Triplets of Belleville" bicyclists, waving their nationalist flags everywhere yet somehow never any soccer hoodlums erupting into violence. Unless, perhaps the era's old's-cool moto journalists left that part out?

Either way, SOMEBODY ought to organize a proper event around that spot. Ideally, like I say, a vintage small-displacement, period-correct recreation type of deal. But hell, I'd even watch it if it were simply a gridlock of BMW touring rigs....

Well - the PICS up above give us another daydream altogether, of a nicely restored chronologically accurate TIME MACHINE of a CB750K, in the sunshine, with clear open roads, sans police interference. What more could you want - a slew of "Bond Girls" and an explosion?

-S.

Offline andy750

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Re: CB750K4 - new updates 10/09/2017 - engine rebuild!
« Reply #155 on: October 09, 2017, 04:46:35 am »
Hey sorry I missed this last post but thanks for posting! Ill take the slew of Bond girls any day  8)
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline andy750

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Re: CB750K4 - new updates 10/09/2017 - engine rebuild!
« Reply #156 on: October 09, 2017, 04:57:45 am »
Update: 10/9/2017, 86, 840 miles

Last year at start of the year (April) on my first run of the year the K4s transmission went - number 3 gear was no longer possible. So engine was pulled and it sat and sat and eventually worked on. The bottom end was cooked - black nasty oil stuck to the bottom, lot of crap in there. Required a whole new bottom end/transmission.

Since that was being done and the top end was examined and the piston rings were found to be failing, an 836 kit (cruzimage) was purchased and installed. After a long expensive summer of getting stock Honda parts the engine was finally finished by Anders (thank you!). He then came down from NH on Saturday and with the help of Alan, installed it and rebuilt the bike all in a morning.

By the time lunch was done it was time to fire the bike up. No issues at all and the first test ride was smooth as silk. No babying the engine here and the bike got up to 75-80 all too quickly. Some minor tune-up stuff to be done (timing, carbs) but a second test ride on the highway shows the bikes pulls strong!

Here is the latest iteration of the K4(sunrise orange) next to the might 810cc K2 (chrome tank). A great combo to have. Big thank you to Anders (and MikeR) for getting this engine done and installed before the end of my riding year. Very much appreciated! Looking forward to next year for some much needed riding time.

cheers
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline Stev-o

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Re: CB750K4 - new updates 10/09/2017 - engine rebuild!
« Reply #157 on: October 09, 2017, 06:17:30 am »
Great update Andy, glad to hear your rebuild went well [not hard to believe with that A-Team!] Your bikes looks great. 

I also rebuilt my K4 this year, have 400 miles on the 836 and all good so far.
'74 "Big Bang" Honda 750K [836].....'71 Honda 750K project.....'76 Honda 550F.....K3 Park Racer.....K5 Fiddy Dolla Special!......CB500 Fiddy Dolla Special too!!............plus plus plus.........

Offline ofreen

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Re: CB750K4 - new updates 10/09/2017 - engine rebuild!
« Reply #158 on: October 09, 2017, 08:06:33 am »
Good to see the redoubtable K4 back in action.
Greg
'75 CB750F


“A lie can travel half way around the world while the truth is putting on its shoes.”
― Mark Twain

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB750K4 - new updates 10/09/2017 - engine rebuild!
« Reply #159 on: October 09, 2017, 10:17:41 am »
Looking good Andy!!
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline andy750

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Some updates from 2017 - 2019

Oil cooler adapter and oil cooler

http://forums.sohc4.net/index.php/topic,175992.msg2047492.html#msg2047492

Leaky CB750K4 after 836 rebuild - and how it got fixed by MikeR

http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836

« Reply #39 on: October 03, 2018, 06:40:20 pm »
Epilogue:
Took a Lyft from work this evening carrying helmet, tool bag, wearing leathers and headed for Mikes...time to ride the bike home!

As always Mike super helpful concerned about potential oil leaks - none so far....had a chat...then it was heading out into the dusky night....feeling the silky smooth engine as navigated the dark twisty country road at a healthy 45-50 mph keeping the rpms up...nice feeling riding at night on country roads.

Took a detour to ride the highway got yo-yo 85...buttery smooth the whole way..could have kept going but time was calling...headed east to home. Big smiles with every twist of the throttle.

Home....no oil leaks! Looking forward to more test miles! Almost a year to the day since I got the rebuilt engine it’s now looking like a strong leak free 836 engine :) fingers crossed!

Thanks for following along I’ll update my CB750K4 thread with any more updates. Thank you Mike!!!!!!!!




Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline andy750

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CB750K4 836cc kit, stock carbs

So after doing some test rides in early 2019 I was having a rough idle after riding the bike for >5 miles. So I:

1. Replaced all rubber boots (engine side/airbox side)

No difference

2. changed out the carbs with a set MikeR went through

Helped but still rough idle

3. Balanced carbs with Morgan Carbtune and checked all airscrews were 1 turn out

Steady idle until warmed up then would get inconsistent

3. Changed spark plugs from Densos (which had been put in new) to NGK D8EA (also brand new)

Success! Idle was stable and then stable for 10-30 mile runs in the 90F heat.

However its not entirely stable after a hot run and I feel there is more tweaking to do. Question I have is where to start looking? Some thoughts at them moment are:

1. Check carbs are balanced?
2. Check camchain tension
3. Check/replace HT wires

Why would the bike idle fine at start up then get progressively less consistent idle after running hot?

Thanks
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline ofreen

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Good to see you are back riding it. I just got back on mine after nearly a year since the last ill-fated ride. What a great feeling.
Greg
'75 CB750F


“A lie can travel half way around the world while the truth is putting on its shoes.”
― Mark Twain

Offline PeWe

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Ignition?
Stock advancer?
Advancer work as it should?
I have seen that points change a little when warm. Dwell change almost 0.5 degrees (8 cyl setting)

I noticed that mine had really sloppy springs when starting it 2014 after the first restore since the 80's.
That time with Pamco ignition. Full advance kicked in way too early. I cut the springs 1/2 wound and reshaped that end.
That fixed it. F line up nice at idle +1200 rpm, full advance at 2600-2700 rpm. That engine has bigger bore, hotter cam, ported head.

My K2 with stock engine got same treatment when I could not set ignition, it was just a little advanced. Advancer set at max counterclockward position that make T to match case mark at TDC.

 If advancer should sit at its other end, ignition should look like matching fine, but true TDC should be wrong and so the true ignition.
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline scottly

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CB750K4 836cc kit, stock carbs



Why would the bike idle fine at start up then get progressively less consistent idle after running hot?

Thanks
Andy
Hey Andy, the air/fuel requirements change with temperature; cooler temps need more fuel, like when a motor is started cold with choke. At higher temps, the fuel vaporizes better, exposing more readily burnable fuel. Try backing the idle mixture screws out 1/8 turns and see what effect that has.
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline andy750

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Thanks guys for the feedback and I like the idea of trying the air screws as I have noticed the bike can start without the choke so it is def running rich at idle.

PeWe I dont think its the ignition based on
1. It has a DynaS since 2003 and its never been touched.
2. Bike idled fine before it leaked and had to restart.
3. Changing the sparks out (see above) helped with the idle.

But I really appreciate the ideas as I know you have done a lot of troubleshooting and I like your analysis!

Bike runs well from stop and can cruise at 85-90mph with no issues (if I were on a closed track for example  8)).

Plan is to take it on an extended ride this weekend to the Catskills, NY and see how it gets on with the 90F heat - probably better than me! Ill report back Monday if make it back in one piece  ;D
Ill be rolling into 88,000 miles probably this evening on the test ride - its been a long time coming!

Cheers
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline PeWe

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Air screws on CB750 stock carbs make more than I have thought before. I tried various settings and found my bike ran uneven lean at 100kmh (60mph) on 5:rh gear. Air screws 1 1/4.
Really bad at 1 1/2 like fuel starvation. Throttles are not much open then.
I had a 2 hour ride with a screwdriver in my pocket ;)

My previous ideas is based on my own findings about a domino effect of something basic cured by wrong setting that will cause other problems.

My K6 got its Hindle 4-2-1 last autumn. The TMR carbs need a huge increase on pilot jets when the flow is much better, much lower back pressure affecting take offs and the first mm of throttle lift

My K2 with stock carbs got bigger mains (115) just as a test. It ran worse on full speed but much better on the needle area so I raised needles one step from middle. Mains back to 110.
 7$6cc air box, Yamiya no numbers 4-4.

This is the charm with theses bikes, always need of a test ride that can be mixed with a restaurant visit in a small village where the country road will pass thru.
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline andy750

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This is the charm with theses bikes, always need of a test ride that can be mixed with a restaurant visit in a small village where the country road will pass thru.

Couldnt agree more. Test ride will be this weekend with a camping trip to upstate NY. There will be some highway and then lots of twisty backroad. And you can be sure Ill be looking out for some interesting dining places. Pics and running update after the weekend  8)
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline andy750

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Denso plugs after being swapped out for D8EAs





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Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline PeWe

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Those plugs look good, right?
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline andy750

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Yes they looked fine but the idle appeared to be improved after changing them out for D8EAs. Not sure if its plugs or HT leads.
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline andy750

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Great day today - quick blast down the Mass Pike/I90 and then all back roads in western Mass and into New York State

300 miles of pure Moto bliss:rolling empty farm roads, quiet small towns, no traffic, bike ran great although idle acting up - if not on the throttle it will cut out at idle - this after 1/8 turn out from one turn out. From 4K upwards this engine just pulls!

Finished the day camping on top of a hill with a fire and a view of the Catskill mountains - perfect!






Sent from my iPhone using Tapatalk
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline PeWe

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Tried less air screw? 1 turn to 3/4? Another ride with a screwdriver and change 1/8 after a 20 minutes ride.

I have learned the hard way to always tighten the air/fuel screw to bottom and open it to desired setting. The screws will be different otherwise and cause uneven idle.

See beautiful roads and stop by a tasty place ;)

I have noticed on both my bikes that lean pilots circuit cause very sensitive idle screw setting. Change just a little and it over react. Too high idle or too low, difficult to get the nice idle. Richer make it calmer and stable.

This on my K6 carbs and Mikuni TMR32. The latter were difficult during take offs, throttle mechanism tricky as is with full throttle on less than 1/4 turn on the handle.

 I prefer 1200rpm on my stock K2. My K6 with higher CR and RC295 cam allowed to idle 1200-1400rpm.
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline andy750

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Great info PeWe and I will try to vary air screw settings on the return 300 mile journey. The pic below with ice cream was for you :)

More later




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Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline andy750

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CB750K4 - new updates 07/10/2019 - running/carb issues partially resolved
« Reply #174 on: July 15, 2019, 05:33:05 pm »
Sunday morning packed up camp and headed South towards a classic 50s diner (I love diners) on an empty Taconic State Parkway at 7:30am. It was a very good start to the day!

After an average breakfast I took PeWes advice and reseated the air screws to just under one full turn out. Voila! Idle was finally steady at 1400rpm. I took video at 50 miles then 100 miles after spirited riding - stayed steady till the end of the 200 mile day and the bike ran great especially after 4000 rpm.

Thank you PeWe and Scottly for the suggestions. And as always a big thank you to MikeR for making this engine possible (and to Anders who started it).

Total mileage for the trip - 500 miles, averaged ~45-50mg. One of the best biking weekends with plenty of empty NY/CT/MA farm roads.

Leaving camp - the hill was pretty steep


The diner


The sights and roads









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« Last Edit: July 15, 2019, 05:35:19 pm by andy750 »
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico (CB750K4), 2003 - European Tour (CB750K4), 2004 - SOHC Easy Rider Trip (CB750K4), 2008 - Adirondack Tour 2-up (CB750K4) , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. VStrom DL1000 2003
4. XLR650L 2006

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

 

;
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