Author Topic: Yolanda 2.0 new pretty carbs  (Read 119192 times)

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Offline KC_Northstar

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #575 on: May 10, 2013, 06:06:08 PM »
"buy a new in tank filter"

Never seen one. got an example?

KC

1971 CB750-K1
1972 CB750-K2
1971 SL350-K1
1971 SL125-K0
1979 CM400A

Offline Vinhead1957

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #576 on: May 10, 2013, 06:06:58 PM »
I think he meant petcock filter

Offline Stev-o

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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline cheftuskey121

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #578 on: May 10, 2013, 06:37:48 PM »
petcock is brand new from honda. I do have a new screen if I need it but its all brand new. as is just about everything on this bike. IW I am unsure about how to fit an inline filter in there. I was worried about gas flow. on the K1 the petcock is on the right and the fuel lines are very short and tight. maybe it would be wise for me to get clear lines with the inline filters so I could see that gas flow was normal?

Offline iron_worker

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #579 on: May 10, 2013, 06:53:45 PM »
I run inline filters with mine. Petcock on the right. It's doable. If I get my tank on soon I'll take pics (ibviously ... lol). You can also get 90 degree inline filters that really help with clearance in there as well.

http://www.redlinecycle.com/Fuel%20Filters.html

IW

Offline cheftuskey121

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #580 on: May 10, 2013, 06:58:33 PM »
awesome to hear! thanks IW i will be getting some soon then, when I get some dollars to spare of course. anxiously waiting for you to get your tank. the community may be just as excited as YOU!

Offline bjbuchanan

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #581 on: May 10, 2013, 07:22:51 PM »
I wouldn't bother with the filters unless you see any type of sediment or anything really. The petcock filters take care of anything in tank that would pretty much screw stuff up. A dirty tank sneaks up on you when you put it on reserve because then that nice standpipe filter is bypassed

I was running one for basically no reason and finally took it off because if you do the job right you don't need em really. They also introduce the extra work of making sure you don't have air bubbles with the tight routing with the gravity feed. Your inline filter won't stop a little piece of rubber from a fuel line if it happens to be the case
The dirty girl-1976 cb750k, Ebay 836, Tracy bodykit
Round top carbs w/ 38 pilots, middle needle position, airscrew 7/8ths out, 122 main jet
Stock airbox w/ drop in K&N, Hooker 4-1

Don't trust me alone with a claw hammer and some pliers

Offline iron_worker

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #582 on: May 11, 2013, 01:44:26 PM »
Well to each their own but I think it's a belt and suspenders style method ... which I like.

IW

Offline Henning

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #583 on: May 11, 2013, 04:20:43 PM »
I too do not see the benefit of inline filters, just added hassle and complication. I had a K1 with a badly rusted tank. One day it died on me, and I was savvy enough to realize it was lack of fuel. Turned out the filter was choked with rust; I dumped the rust in the gutter and rode on. Five minute roadside repair. I never had a problem with fuel overflow in the 50k km I put on that bike.
71 or thereabouts 750 K1 - this one should have been put down

Offline cheftuskey121

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #584 on: May 11, 2013, 04:31:31 PM »
I know I sound like a broken record but I still have not gotten into the carbs. I started it up again and in the 5 minutes it was running no hesitation or stuttering but it was pissing gas out of #2 and #3 carbs AND gas was coming out of the atmosphere lines that route over the airbox. That does not seem good. I thought those were just air pressure lines I didn't k ow gas could actually back up out of there. Banging on the bowls with a screwdriver did not unstick them. May get in there tomorrow

Offline Tews19

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #585 on: May 11, 2013, 04:40:45 PM »
Chef remove just the bowls. You will be able to tell if they are sticking that way no need to remove them off the bike. It's a two minute thing. Sounds like they are over flowing enough where it may get in your engine and ruin the oil with to much gas in the oil. Then you will have more to figure out then just the carbs.
1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline bjbuchanan

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #586 on: May 11, 2013, 06:00:51 PM »
Yeah you are definitely overflowing you just gotta find the reason. It is pretty bad if it is coming outta those vents. Maybe a gasket not seated good and the float is stuck down.
The dirty girl-1976 cb750k, Ebay 836, Tracy bodykit
Round top carbs w/ 38 pilots, middle needle position, airscrew 7/8ths out, 122 main jet
Stock airbox w/ drop in K&N, Hooker 4-1

Don't trust me alone with a claw hammer and some pliers

Offline Roach Carver

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #587 on: May 12, 2013, 06:06:05 AM »
I would take off the bowls and fiddle with the floats. Make sure they are going up and down an then I would put bowls on and check individually. Take one bowl off. Fuel on. Push the float up and see if the fuel stops and at what point. Will give you a ball park on float height too.

Offline bender01

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #588 on: May 21, 2013, 07:52:43 PM »
Lots of folks watching Yolanda. But Have you voted for this bike in BOTM? Or voted otherwise? Vote!
http://forums.sohc4.net/index.php?topic=121689.0
75 550 K1
74 750 K4
1968 450 K1 Super Sport
74 750k 836 project
http://www.bikepics.com/members/bender01/
So, the strategy is to lie to people you are asking for help?

I think I'll be busy going for a ride.

Good luck!
Two Tired Quote !

Offline edhaeuser

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #589 on: May 22, 2013, 08:17:18 PM »
+1 on checking the floats for binding and checking the needle valves.  I vote for fuel filters too, if you can fit them in there.  It is amazing how a tiny tiny foreign object can mess up your float valve.  Maybe remove the float needles and blow some air through the orifice to dislodge any offending particles that may be there?  Prolly want to unhook you fuel line for that.

Offline cheftuskey121

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #590 on: May 23, 2013, 11:20:49 AM »
Ed, it turned out it was the number 2 carb float. I guess it was binding on the gasket. I flipped the gasket over and sat it back in and it hasnt leaked since. just went through a fun time when my bike kept cutting out. narrowed it down to blade connectors going to my ultimate coils (soldered those up). still had trouble and found it in my headlight bucket. the killswitch wire (black/white) was just ever so loose. soldered that too. now its starting up on a few kicks instead of 20 kicks and does not stutter or die. yay.

onto get the starter out so I can replace the brushes, then the stator cover off to I can try to stop that leak. then its on to the 3000 mile tune up (cam chain, adjust valves, set timing, another oil change)

still need to fix my non-functioning speedometer....it looks nice.

Offline edhaeuser

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #591 on: May 23, 2013, 01:50:20 PM »
Ed, it turned out it was the number 2 carb float. I guess it was binding on the gasket. I flipped the gasket over and sat it back in and it hasnt leaked since. just went through a fun time when my bike kept cutting out. narrowed it down to blade connectors going to my ultimate coils (soldered those up). still had trouble and found it in my headlight bucket. the killswitch wire (black/white) was just ever so loose. soldered that too. now its starting up on a few kicks instead of 20 kicks and does not stutter or die. yay.

onto get the starter out so I can replace the brushes, then the stator cover off to I can try to stop that leak. then its on to the 3000 mile tune up (cam chain, adjust valves, set timing, another oil change)

still need to fix my non-functioning speedometer....it looks nice.

Great to hear that you got it running well!  Good luck on getting everything else sorted out.  I'm sure you will with your tenacity.  I spoke to the machinist today about my cases.  He thinks he will have them finished tomorrow.  I'm curious to see how they will come out.

Offline Picasoo

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #592 on: May 30, 2013, 04:53:01 AM »
Great work Chef... I enjoy read it!!
Greets from Serbia!!

'75 cb750F super sport

Offline cheftuskey121

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #593 on: June 14, 2013, 05:47:21 PM »
Great work Chef... I enjoy read it!!
Greets from Serbia!!

thanks so much! glad you enjoyed the journey, I know I have!

Offline cheftuskey121

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Re: First Bike: Yolanda the Honda CB750 K1 (no more left boot leaks!)
« Reply #594 on: June 14, 2013, 06:01:00 PM »
figured I would give a little update. been doing lots of riding, put about 250 miles on her so far! what fun.

I had a pretty bad stator cover leak. I suspected that upon reinstalling my newly chromed covers...the placement dowel did not fit in the hole properly due to the plating. it happened on my shifter cover and I have to pry the squished dowel out of the crankcase and insert new ones, as well and bore out the holes in the covers to actually fit the dowels. well...thats exactly what it was. I finally got tired of my entire left boot being covered in oil, as well as the back half of the bike from blowback. I had to add a quart of oil after 100 miles. the major thing that took me off the road was cylinder 3 was not firing.

I was riding around the other day for about 4 hours and suddenly I heard the exhaust note change. it got slightly deeper. the bike vibrated more and was sluggish. it did not stutter like a carb or electrical problem, just when I gave it gas it took forever to do anything. had no idea what was wrong but I was 30 minutes from home at a buddies. made it home safe and then let her cool down. when I started her up before an oil change, I noticed pipe 3 was not hot. barely warm. not good.

well it was time to change the starter motor brushes so I could actually use the button instead of always kicking it. I cant seem to kick the motor while on the bike, so its frustrating to always have to be off to the side. did the oil drainage, took of airbox, carbs, cam chain tensioner, starter cover, sprocket cover, shifter cover, and stator cover. time to fix that broken starter motor. I was able to get the starter out in about 25 seconds. very easy after ready some tips here. use the long bolts that hold the starter in the motor and screw them into the cover holes. then you can have some leverage to grab onto, make sure your starter wire is OFF the solenoid and give it a little slack through the starter hole, then take off the starter gear and push the starter back towards the points cover, then wiggle up and out. replaced the brushes which was straightforward. put on new honda gaskets (new dowels that fit properly) and got everything back together. no leaks!

so when messing with new spark plugs....I was using NGK iridium, switched to denso xes24u per hondaman recommendation, I noticed the number 3 spark plug wire had burn mark in it. my cables were too long (single loop) and the pipe clamp made contact and burned through it. NOT all the way but I suspect it was shorting or arcing to ground somehow causing the plug to foul?? is this possible?

new plugs, new spark plug wire (shortened #2 and #3 so no more contact with anything hot!), and running on all cylinders. I seem to be running super lean now. all 4 of my idle screws are 2 turns out. I searched and cannot find confirmation.....2 turns out means 360 degrees counterclockwise from the closed position right? I need to richen it up by screwing it inwards. 110 main jets to match 341 pipes, 40 pilot jets, needle clip 2nd from top (dropped the needle down one per hondaman recommendation because the K1s are super rich)

so have I naturally leaned things out too much to begin with?

Offline iron_worker

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Re: First Bike: Yolanda the Honda CB750 K1 (no more left boot leaks!)
« Reply #595 on: June 16, 2013, 10:32:03 AM »
If your plug wire was arcing and missing then your plug could get gas fouled since the spark would be happening outside of the combustion chamber and not igniting the fuel/air. So the plug would eventually become soaked with fuel and probably fouled. It should still work though once dried out though I would think.

What makes you suspect you are lean and in what throttle ranges?

To adjust your idle mixture you can just interpret how your bike reacts to a quick throttle "blip". You should be able to quickly open the throttle up to 1/2 way and the bike should respond cleanly. Since these carbs don't have accel pumps they need to be slightly rich at idle to accomplish this. With your bike at operating temp I would see how your bike reacts to quick throttle blips from idle and slowly richen your mixture (turn clockwise) a bit at a time until you get a good clean response. It could help to have your throttle marked with tape/marker so you can see where 1/2 throttle really is.

2 turns out means 720 degrees out from seated position. IE 2 complete revolutions.

IW

Offline cheftuskey121

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Re: First Bike: Yolanda the Honda CB750 K1 (no more left boot leaks!)
« Reply #596 on: June 16, 2013, 02:48:08 PM »
thanks IW for the detailed response. yeah I am rectifying that plug issue. when I buttoned the covers back up, I put electrical tape on the #3 coil wire so I could get it running. something is off though. its not idling perfect like before. I can hear the idle change by 50 rpms up and down. when I try to use my timing light on the #3 wire it intermittently registers. so I am going to replace my wires to make sure they are good. it will give me a change to look over the coil connections again too.

I have checked my plugs with the new denso ones and they were bright white. not even tan let alone brown. the NGK iridiums that I had in before were at least a tan color. after I get the wires replaced I will try again. nothing else has changed so I am a little baffled. I have good throttle response, except NOW when I take off from stop it bogs down and I have to rev it. before I took it off the road to change gaskets it did not to that. it ran like a champ. I think its related to that #4 wire. I will report back after I take care of the wire.

Offline Garystratos201

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Re: First Bike: Yolanda the Honda CB750 K1 (no more left boot leaks!)
« Reply #597 on: June 16, 2013, 02:58:34 PM »
Don't forget the spark plug caps, that was the problem with my idle........gary
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Offline deafcaferacer

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Re: First Bike: Yolanda the Honda CB750 K1 (issues)
« Reply #598 on: June 16, 2013, 08:36:57 PM »
Look here Chef. If you haven't cleaned your pet cock lately you may want to.


I'm sure this was unintentional but I'll vote it dirtiest post of the year anyway, lol.
'73 CB750k engine, hubs, and a '76 tank, on 'a 78 frame. Go figure.

Offline cheftuskey121

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Re: First Bike: Yolanda the Honda CB750 K1 (no more left boot leaks!)
« Reply #599 on: June 17, 2013, 04:23:14 AM »
Ha! thats funny deafcaferacer. Gary I believe my new spark plug caps are great. I changed out my wires for new and it seems to be back to normal. dialing in my plugs now. got them too rich last night, leaned them out a tad so today after my short work day I will take her for a ride and check.

for fathers day I bought my dad a leather riding jacket and let him take my bike out for a spin. I was not so concerned about him. he used to race professional motocross in the 80s and then amateur in the 00s. he has owned several street bikes including a cb450. I was just worried about watching my bike go down the road without me on it for the first time. I do not like this feeling. motorcycles are very personal for a reason. especially after 6 months of hard work! he really enjoyed it though and said everything feels and sounds fine. its good to have another opinion because my own hold no water due to lack of experience.

I am fairly certain he is going to be getting a bike soon now ;) he is a Harley guy, so unfortunately no 750 build for him. thats ok, when I actually get any sum of money again I'll be looking for a new project.