SOHC.co.uk Forums > CB350/400
400/4 Garaged over the winter.
McCabe-Thiele (Ted):
I'm certainly no expert or authority so take my observations as anecdotal at best
Carb synch if everything else is correct i.e. timing, mixture, carbs free of any issues, no intake air leaks, no throttle return bindings.
K2-K6:
Going up hill in top gear may offer the most challenging task to the toque available on these.
They just don't make much of of it and sixth is effectively "overdrive" and may not be possible. You have to ring it out in fith to play it properly, dont hold back on this as it can be far more compromised trying to run lower rpm.
Essentially, if it can't pull sixth to let it gain rpm, then you get the carb slides wide open at too low an rpm, then the carb venturi vacuum is below expected and results in weak mixture. Detonation in this circumstance is a very real possibility and will,cause damage to combustion chamber.
Bryan is absolutely right, revs just don't hurt them, they are fine to spin and really need it.
ComfySofa:
Righty...so sounds normal...although im 1 down 4 up....i will say that when i dipped into the 9k area it did seem more eager...just feels....tight, but then its just been rebuilt...as for the carbs they have been balanced but i will check for airleaks and what not....roo did ssay to me that the tappets being out can also affect power (and i know one side it still tappy, as it were).
Thanks for all the replies...always a learning process but just want to be sure (however it runs) is the way it should..!
taysidedragon:
How many miles have you done since the rebuild? The engine might need running in, it will certainly loosen up a bit in the first 250-500 miles if you have new bearings, pistons, etc.
The high idle speed probably just needs adjusting down with the large idle control screw. It will only need adjusting a couple of times as the engine loosens up, should be stable after that if everything else is kept in spec.
ComfySofa:
Hi there...probably a couple of hundred now...totall forgot about the idle screw (probably could have done that while i was out)
Bryan did say about 500 for the oil change...
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