Carb problem?
 

I've just been out fiddling with the 600ss before taking it down for a dyno session next week and while attempting to set the idle to something sensible came across the following:

I've balanced the carbs with vacuum gauges but the idle is really lumpy at 1200rpm. If I set the idle higher it is smoother, but when I blip the throttle the revs stick at 3500 until I switch off. Then when I start up again, its back to a lumpy 1200 rpm.

The carbs are exactly as I used them on the 675 last season, with a dyno jet kit with a 144 main jet.

Has anyone come across this, or do I have to strip down the airbox and carbs and investigate? Alternatively I could just leave it for the dyno........

Oh for the flatslides ;)

Paul sounds like an air leak to me.... Check all the manifolds etc.
glyn

:frog:

Could be the air screws - remember the std setting is waaaay too lean, screw it out at least 3 turns more than std. (the std setting can sound as if its an air leak, its so lean)
And the o-ring on them can get damaged ... it can come off, but stay 'inside' when you take the screws out, and then get damaged and flap about a bit when you put the screws back in.

As Glyn says it maybe down to a air leak or possibly a dodgy diaphragm, Having never stripped my carbs I take it that the little housings on the side contain small diaphragms that control the coasting in-richners which could be sticking and causing a problem

Neverhad any problems with our 620's!:frog:
Butch

Cheers chaps, looks like I'll be stripping it all down to check out the suggestions :mad:

I knew that I shouldn't have just chucked the carbs in a box after Brands

Butch - I'm surprised that you know what a carburettor is - or did you borrow a history book from John?:lol:

[quote]Originally posted by paynep
Cheers chaps, looks like I'll be stripping it all down to check out the suggestions :mad:

I knew that I shouldn't have just chucked the carbs in a box after Brands

Butch - I'm surprised that you know what a carburettor is - or did you borrow a history book from John?:lol: [/quote
Impertanant youngster!
Corse i know what one off them is,ive got 17 off them on the baby R (carbon and titainium -of course!)
Butch:lol:

Well, I stripped everything down (again), put it all back together but wound the air screws out to 3 1/2 turns as per the 750 ss dynojet kit and things seem better, so good call Phil.
Carbs balanced again and dyno session booked.....watch out for the bhp shock!

Good news paul.
btw - where do you dyno :cool: