Author Topic: What did you do to your bike today ?  (Read 1593053 times)

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Offline Cb4003311

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HELP! 75 CB400F RUNS GREAT WHEN COLD BUT NOT WHILE HOT
« Reply #27825 on: May 04, 2019, 01:50:56 pm »
Hello guys. I have a 75 cb400f supersport that I rebuilt this isn't my first sohc build iv done a couple but have ran into the same issues with a bunch and never fixed it just sold them. The bike is completely stock besides a shorty reversed cone muffler. Jets are stock and carbs cleaned. New coils, points ect. The bike starts and idles like a champ and I can ride it with no issues but when it gets hot going from a stop it sputters and the clutch feels like it engaging when the hand clutch is pulled all the way in at a stop. The choke does help start when cold but doesnt need it for more than 5 seconds or it will shut off. Has a new air filter I tried running the bike with the air filter out when hot and it didnt like it. I want to put a Spirit of America sidecar on it soon but want it running 100% before I add 150 pounds to it. Any help would be appreciated

Offline MoMo

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Re: What did you do to your bike today ?
« Reply #27826 on: May 04, 2019, 10:57:57 pm »
Hello guys. I have a 75 cb400f supersport that I rebuilt this isn't my first sohc build iv done a couple but have ran into the same issues with a bunch and never fixed it just sold them. The bike is completely stock besides a shorty reversed cone muffler. Jets are stock and carbs cleaned. New coils, points ect. The bike starts and idles like a champ and I can ride it with no issues but when it gets hot going from a stop it sputters and the clutch feels like it engaging when the hand clutch is pulled all the way in at a stop. The choke does help start when cold but doesnt need it for more than 5 seconds or it will shut off. Has a new air filter I tried running the bike with the air filter out when hot and it didnt like it. I want to put a Spirit of America sidecar on it soon but want it running 100% before I add 150 pounds to it. Any help would be appreciated



It sounds like you are saying the clutch does not disengage when the lever is pulled in? ….Larry

Offline Bankerdanny

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Re: What did you do to your bike today ?
« Reply #27827 on: May 05, 2019, 07:52:08 am »
Reinstalled the exhaust, hooked up the temporary tank and started it up.  It started without any issues,  so it appears that I  hooked up my Hondaman ignition correctly.
« Last Edit: May 05, 2019, 01:05:02 pm by Bankerdanny »
"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki 80 (K11 probably, it's been 30 years), '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline PeWe

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Re: What did you do to your bike today ?
« Reply #27828 on: May 05, 2019, 08:54:26 am »
My K6 got new oil pump rotors that Mirko (MessnerMoto) has made.
I removed the Hindle 4-2-1 and remembered to weigh it. Long muffler 1100g, all the rest 2400g. Total 3.5kg
I have the short muffler too I ordered for eventual future use while order and shipping. It weigh 950g.

Quick test ride and it really look like the oil pressure is higher when warm. 
Last summer was very hot which was visible as low oil pressure. I stepped up to 20W-60 oil when oil warning lit at idle.  This year if hot I might drain 1 bottle volume and refill a bottle of 20W-60.

Again about oil pump assembly. It is not enough to prime pump with oil and rotate the sprocket a lot.
Both valves need to be loosened and let air out while rotating the sprocket with pump complerely drained in  a opened box with oil. The under pressure will show when blocking one of the 2 holes beside sprocket with finger while rotating. Other hole change direction when rotating. It will suck good when air is out and pump is properly primed.
« Last Edit: May 08, 2019, 09:16:33 pm by PeWe »
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline HMBdreamer

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Re: What did you do to your bike today ?
« Reply #27829 on: May 05, 2019, 07:41:49 pm »
Last week I paid the DMV fees and registration on my Cb750k4 that was only 16 years overdue, and today I took my two girls (9 and 12) for their first motorcycle rides! It's a day I'm sure we will all remember fondly for a long time.
It's ok if it leaks a little oil, that just means there is oil in it.
It's when it stops leaking that you should worry.

Online 70CB750

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Re: What did you do to your bike today ?
« Reply #27830 on: May 06, 2019, 03:56:19 am »
Last week I paid the DMV fees and registration on my Cb750k4 that was only 16 years overdue, and today I took my two girls (9 and 12) for their first motorcycle rides! It's a day I'm sure we will all remember fondly for a long time.

Nice!

Offline Bankerdanny

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Re: What did you do to your bike today ?
« Reply #27831 on: May 07, 2019, 08:27:43 am »
Ordered brake lines for the front. I am not sure if I will get them by this weekend, so I may be off the road for another week.
"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki 80 (K11 probably, it's been 30 years), '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline WhyNot2

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Re: What did you do to your bike today ?
« Reply #27832 on: May 08, 2019, 08:39:36 am »
Split open my little CB100 engine.

Should I use sealant or will just using the gasket be ok?
If it ain't raining, I'm riding.....~~{iii}?~~prost

If it sounds like I know what I'm talking about, it's because I cut and pasted from someone else.

Offline MoMo

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Re: What did you do to your bike today ?
« Reply #27833 on: May 09, 2019, 06:40:24 am »
Split open my little CB100 engine.

Should I use sealant or will just using the gasket be ok?



Shouldn't need to use sealant with a proper Honda gasket. You might want to start a thread in other bikes

Offline WhyNot2

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Re: What did you do to your bike today ?
« Reply #27834 on: May 10, 2019, 04:11:56 am »
Split open my little CB100 engine.

Should I use sealant or will just using the gasket be ok?



Shouldn't need to use sealant with a proper Honda gasket. You might want to start a thread in other bikes

Thanks, will do.
If it ain't raining, I'm riding.....~~{iii}?~~prost

If it sounds like I know what I'm talking about, it's because I cut and pasted from someone else.

Offline Tews19

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Re: What did you do to your bike today ?
« Reply #27835 on: May 11, 2019, 03:09:28 pm »
I finished up this 76 750 yesterday. Nice survivor, mostly original bike with new side covers from Yamiya. I also put on a set of 300s..

Sent from my SM-G955U using Tapatalk

1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline setdog

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Re: What did you do to your bike today ?
« Reply #27836 on: May 11, 2019, 06:48:38 pm »
got the motor back into the frame, 73 cb750
stock motor, basically just cleaned the bottom end, new rings,
new gaskets and seals.
feels like once the motor is back in the frame the hardest part is
behind me.
My toolbox consists mainly of hammers.

76 CB 200T. (sold)
75 CB 750 K5. (sold)
74 CB 750 K4. (current rider)
73 CB 750 K3. (build)

https://www.youtube.com/user/setdog100

Offline PeWe

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Re: What did you do to your bike today ?
« Reply #27837 on: May 12, 2019, 12:22:46 am »
Split open my little CB100 engine.

Should I use sealant or will just using the gasket be ok?



Shouldn't need to use sealant with a proper Honda gasket. You might want to start a thread in other bikes
+3
I used an Athena gasket kit on my CB750 K2. Head gasket went on dry as all the gaskets. It is a later model gasket with 8 wider holes. Cylinder and head earlier with smaller holes so it got 8 o-rings + good 2 for oil going up.
The trick is to re-torque until nuts stops to move/gasket no longer compress. I had to tighten 3 times more after first time.
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

Offline ekpent

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Re: What did you do to your bike today ?
« Reply #27838 on: May 12, 2019, 04:27:01 am »
I finished up this 76 750 yesterday. Nice survivor, mostly original bike with new side covers from Yamiya. I also put on a set of 300s..

Sent from my SM-G955U using Tapatalk
  Lookin' good Nick !

Offline toomanybikes

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Re: What did you do to your bike today ?
« Reply #27839 on: May 12, 2019, 04:36:05 am »
Actually was yesterday, but replaced the tires, chain, and sprockets with parts from this century (see pic) and then took her out for the first real ride. Ran into cyl4 firing problems as mentioned in a separate post.

Offline Tews19

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Re: What did you do to your bike today ?
« Reply #27840 on: May 12, 2019, 06:23:40 pm »
I finished up this 76 750 yesterday. Nice survivor, mostly original bike with new side covers from Yamiya. I also put on a set of 300s..

Sent from my SM-G955U using Tapatalk
  Lookin' good Nick !

Thanks Eric! She is all ready to be ridden! Now it's time to button up the K0 engine and then to restore the 69 750 I picked up not to long ago.
1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline Kelly E

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Re: What did you do to your bike today ?
« Reply #27841 on: May 12, 2019, 06:29:46 pm »
Since I built a ramp for the wife's duck pen today I was able to install tapered roller bearings on the 73' 500, clean and rebuild the fork legs and assemble the front end. Not bad for mothers day. 8)
Never Give Up - Never Surrender

1974 Honda CB550 K0
1980 Suzuki GS1100E
1984 Honda VF700S Sabre
1994 Kawasaki Concours ZG1000A9

Offline spotty

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Re: What did you do to your bike today ?
« Reply #27842 on: May 12, 2019, 07:12:05 pm »
took the back wheel out of the vmax y'day to give it a clean and paint....wheel bearing are fcuked, disc is within tolerances

tried to get the bearings out, broke my circlip pliers in the process,that put an end to that and a start to beer consumption
It seems I've kicked the Honda habit again...anyone mind if I stick around ?

Offline Bankerdanny

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Re: What did you do to your bike today ?
« Reply #27843 on: May 12, 2019, 07:44:10 pm »
Not what I hoped, but still a productive day.

The new brake lines that were on time for delivery by 8pm yesterday at 9am were delayed by noon and haven't shown up yet. So bike still not rideable yet.

Today I fabricated new fasteners to hold on my seat trim by welding together washers and 4mm tapered head machine screws. Then I installed the spring for my center stand. I still need to modify the stop from the Delkevic because it's too high.

Next up was properly tightening the bearings on the triple. I did a tapered conversion last year, but the front end didn't feel quite right. Once I got a pin spanner on the nut it was obvious I didn't tighten it enough when I put it together last summer.

Finally I stripped the paint off the tank and did some prep work on the tail piece.I won't have time top paint it next weekend, but it will be ready for it by the end of the day next Sunday. Now I really need to settle on a color.
« Last Edit: May 12, 2019, 07:49:22 pm by Bankerdanny »
"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki 80 (K11 probably, it's been 30 years), '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline Choppedsohc

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Re: What did you do to your bike today ?
« Reply #27844 on: May 13, 2019, 03:36:03 am »
I ordered a new reproduction wire harness and some forward controls. Small steps in the way of progress.

Offline Bankerdanny

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Re: What did you do to your bike today ?
« Reply #27845 on: May 13, 2019, 07:58:57 am »
I finished up this 76 750 yesterday. Nice survivor, mostly original bike with new side covers from Yamiya. I also put on a set of 300s..

Sent from my SM-G955U using Tapatalk

What a beauty Nick. When I finish up mine we need to get together for a ride.
"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki 80 (K11 probably, it's been 30 years), '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline Tews19

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Re: What did you do to your bike today ?
« Reply #27846 on: May 13, 2019, 08:01:21 am »
For sure Danny! I'll be riding the hopefully finished K0 or the KZ1000 this summer
1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline Maineiak07

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Re: What did you do to your bike today ?
« Reply #27847 on: May 14, 2019, 05:07:34 pm »
Not today, but this past Saturday spent two hours at the CT DMV and left with a classic plate for my 78 750F. Hasn't been on the road for the past two years after moving from WA.  Glad to be out riding again!

Offline wolf550

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Re: What did you do to your bike today ?
« Reply #27848 on: May 14, 2019, 08:40:50 pm »
switched my uni pods out for an original air box setup on my 71' cb500/550 and getting it dialed in.
74' CB550
71' CB500/550

Offline Terry in Australia

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Re: What did you do to your bike today ?
« Reply #27849 on: May 15, 2019, 03:53:40 am »
I bought my current "Swamp Rat" project from a guy from my home town a couple of weeks ago. It was leaning up against his shed outside, in the weather for 10 years, with no carbs, seat, tank, electrics etc, just a rusty frame, rotten wheels and a seized engine.

Terry's Swamp Rat CB750 28 Apr 2019 9 by Terry Prendergast, on Flickr

When I took the head off this was what the two cylinders with valves open looked like:

Friday K2 fiddling 3 May 2019 9b by Terry Prendergast, on Flickr

I replaced two sleeves and two pistons that an old ex-member here sent me many years ago, gave the other cylinders a good hone too, and shoved it back together.

Swamprat replacement sleeves 1 by Terry Prendergast, on Flickr

Sunday Swamp Rat fixing 5 May 2019 by Terry Prendergast, on Flickr

I cleaned the sump pan and oil pump, just to be safe, because "Safety" is my middle name.........:

Swamp Rat Sunday 12 May 2019 5 by Terry Prendergast, on Flickr

Swamp Rat Sunday 12 May 2019 4 by Terry Prendergast, on Flickr

I found an oil tank and hoses, some carbs and coils in my garage, hooked up a battery and temporary fuel tank, and fired it up.


Sweet. I need to replace the wheels as the rusty rims have holes so big you can put your fingers through them, and the tyres have all but rotted off. The frame looks OK, except for a couple of airbox tabs that someone cut off, so next job is to pull the engine, remove all the fcuked parts, and get the frame blasted so I can hit it up with some paint. Then I can turn it back into a bike. ;D


I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

 

;
Honda