SOHC.co.uk Forums > Project Board

CB466f

<< < (4/29) > >>

MarkCR750:
Are you running a standard air box and filter?, it could be a little lean if not, that would give poor pick up on acceleration, are the float heights correct?, do you carbs have an accelerator pump like the CB750, maybe not but if they do check that it's delivering jets of fuel when the throttle is twisted quickly, what's it like on hills? Oh hang on you're in Holland you wouldn't know would you 😄.

Erwin83:
Hi mark,

Yes carb settings are all standard, carbs newly built with new jets and needles, etc.. I'm also running a standard filter and airbox. Only thing different from a standard cb400f is the exhaust (open 4-2, see pics).
A cb350/400 does not have an acceleration pump btw.

After synchronising, i haven't played around with the airscrews at all. They be a bit far out.
Is a bad pick-up from idle "typical" for a lean idle?
If so, which way is leaner, which way is richer (clockwise, anti-clockwise)?
I would say, clockwise is close, so less air, so richer. But i can't really find this info.

Thanks for the advice.

Erwin

kevski:
Screw should be around 7/8 of a turn out + or - 3/8 of a turn my own 350 are 1 turn out.

Erwin83:

--- Quote from: kevski on April 29, 2017, 10:09:13 PM ---Screw should be around 7/8 of a turn out + or - 3/8 of a turn my own 350 are 1 turn out.

--- End quote ---

Thanks. But i'm running a 400cc engine with the 400 carbs etc.
For the 400, screws should be 2 +/- 0,5 turn out, if i remember correctly.
But those are numbers from the book. Not sure how strict that is.

kevski:
I just see you are running open pipes, this can affect the running as no back pressure, you may need to increase the size of the pilot jets to compensate, the information for the air screws is correct and turning them in will increase the fuel at low engine speeds but may not be enough.

Navigation

[0] Message Index

[#] Next page

[*] Previous page