SOHC.co.uk Forums > CB500/550

CB500 runs lean and doesn't want to pull through

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murdock:
which carburettors do you have ?

are the carburettors statically synchronised?

 do not screw in the throttle any further if the engine has not been softened.

Johnwebley:
Check the ignition timing, it could be over advanced.
If you can, use a strobe at 4,500rpm

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deltarider:
When you rev and snap close the throttle, does RPM quickly return to idle* or is it with some hesitation**? Are your jets etc. genuine Keihin or aftermarket?
*   If it returns quickly, which is good, I'd verify fuel supply is sufficient riding. Any 'extra' inline fuel filters that can impede fuel flow? You may want to read this: http://forums.sohc4.net/index.php/topic,187633.msg2176352.html#msg2176352
** Verify the operation of advancer is smooth. If operation is smooth (good) I'd check for air leaks.
When you are in doubt of airscrews position, I may be able to help; where about in A'dam are you?
Can you make it to my garage near the Weteringcircuit?

RBoss:
Thanks for all the replies!

I have the feeling it is the ignition timing. I rebuilt the engine without adjusting the timing again and I think that should be done, I did put the plate in the same position but maybe something is off.  I have the feeling that it can’t be the carbs as I had them rebuilt before I rebuilt the engine and I tested them on the bike before that and all went well.


--- Quote from: deltarider on February 24, 2022, 12:26:10 PM ---I may be able to help; where about in A'dam are you?
Can you make it to my garage near the Weteringcircuit?

--- End quote ---

@deltarider, very nice offer! The bike is currently in Driebergen and I’ll try to fix the ignition there. Might that not work, I live close to the Oosterpark so the Weteringscircuit (schans?) is very close, I will keep you posted on the ignition timing!

Ruben

Trigger:
All the symptoms you have pointed out, point to timing but, i would check the cam chain is not one tooth out first before, you go on a wild goose chase with electrics   ;)

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