SOHC.co.uk Forums > SOHC Singles & Twins
New Money Pit
Oddjob:
I'd try the bubble test in a bowl of petrol as well Phil, petrol has an ability to gain access into places that water won't get into. Also check the height of both sides of the float in case it's twisted.
You sure the idle jet mixture screw opening isn't blocked?
philward:
Both sides of float same (checked for twisting). Idle jets defo clear and engine revs rise in response to the air screw being screwed in and out
Oddjob:
Can you try running it without the air filters?
philward:
Yep, I did prior to last carb strip (last week) - carb pistons were responding to vacuum and moving up and down in mid and higher rev range. Is that what you were going to suggest?
K2-K6:
Have you any vacuum readings from carb sync ? If they are too high that would indicate that the slide is too low at tickover, to make it suck fuel in excess of target.
Things like air passage to slide volume/lift chamber, springs on slide if it has them etc will all have more effect in error at low rpm.
Possibly look at opening the static tickover rpm to lift it slightly, then make idle circuit richer to calm it down, that can give better "quenching" of throttle shut idle establishment.
Are the idle adjustment within decent range when you set the screws ?
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