SOHC.co.uk Forums > Project Board
CB500 Four 1976- some issues!
exelbyt:
--- Quote from: matthewmosse on April 25, 2016, 08:07:56 PM ---I had a weeping head gaskett for years, in my case I had no issues with tickover being high. I read somewhere that Honda cables are tefalon lined and may swell if oiled, but a remote fuel supply rigged up should give a clear view of if the carbs and cables are free to move their full range, and give access to try spraying something like wd40 onto the inlet tract to see if it highlights and inlet leaks, I personally suspect it is how the cables are routed from carb to twist grip or someting jamming against part of the carbs. I take it the choke is working normally.
--- End quote ---
I will try the WD40 trick. The throttle cable is brand new, is routed freely to the carbs and the carb has full range of movement and rests on the stop when the throttle released.
florence:
I notice that like me you have an adventurous exhaust pipe. Have you increased the main jet size?
Bryanj:
Plastic mudguard only works if you use the original bracket to fit the blade to, rubbers between carbs and head can leak as can the O rings between the alloy manifolds and the head. In a lot of years i have NEVER known a head gasket leak give high revs. NB clamps on the manifold rubbers need to be the narrow honda ones NOT jubilee clips
exelbyt:
PROGRESS REPORT;
I have now sorted all the issues by replacing the sprocket to one closer to stock (35t) and rebuilt the carbs.
The latest issue is to do with tuning the carbs. I have scoured all the threads on sohc and found a wealth of information about carbs etc.
I am currently running
100 main, 40 idle jets
1 and half air screw
Clip position 4/5
With the same exhaust and air filter from the picture about.
It still isnt running right. There is a flat spot which occurs at 1/2 throttle and since i change to 100 main jet (from 130) it has been stalling intermittently at idle after a short run. Up until 1/2 throttle it seems to purr fine, but after 1/2 and about 5000revs it doesnt seem to be firing on all cylinders.
Any thoughts? Or any good ideas on where to look for advice?
Thanks!
Sent from my iPad using Tapatalk
JamesH:
Are you running the stock factory Airbox and intake stubs?
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