Poor Idle And Carb Balancing
Posted: Mon Aug 29, 2011 7:09 pm
Hi my L3 has suffered with a poor idle ever since ive owned it (since march).
What happens is the revs will hang at around 2krpm when slowing down then randomly at some point drop to 600rpm where it will sit until you move off then the process is repeated although occasionally the revs will drop properly to 600rpm straight away.
Now lately since ive fixed my blowing headers the bike will occasionally cut out at idle and is then a pig to start and does eventually normally after a bump start with lots of spluttering and the odd flame indicating the bike is running rich.
Today i managed to borrow a carb balancer from a mate so have had a look at the bike, the carb balancing was way out and i struggled to get a decent constant idle to set them with took alot of playing with the remote idle adjustment knob.
The minute i put the screwdriver on the end of the balancing adjustment screw without turning the screw the bike would start reving up, i assume this is not normal i suspect possibly the carbs aren't mounted in the rubbers properly and my pressure on the screw is opening air leaks.
After persevering ive got the carbs balanced roughly near each other the idle's still crap so i did a quick test of spraying carb cleaner onto the tops of the carb rubbers on all but the 4th one the cleaner caused the engine to rev up so there's definitely air leaks there.
Does anyone know how much new rubbers are from cradley?
Also is there a gasket between the rubbers and the engine?
Does anyone have any ideas as to why the bike has started cutting out just from fixing an exhaust leak?
The bike has stage 1 dynojet needles fitted with the rest of the jets being stock sizes i don't know what the idle settings for the carbs are set to though i assume they can't be far out as the bike goes well enough once going just at standstill it's hit and miss.
Also when on choke the bike revs up to just under 4krpm is this normal, makes a hell of a racket with the scorpion can on there.
Sorry for all the questions can find my way round a car engine happily enough but bikes are still abit new to me
cheers
chris
Edited by CaNsA :- To make for easier reading.
What happens is the revs will hang at around 2krpm when slowing down then randomly at some point drop to 600rpm where it will sit until you move off then the process is repeated although occasionally the revs will drop properly to 600rpm straight away.
Now lately since ive fixed my blowing headers the bike will occasionally cut out at idle and is then a pig to start and does eventually normally after a bump start with lots of spluttering and the odd flame indicating the bike is running rich.
Today i managed to borrow a carb balancer from a mate so have had a look at the bike, the carb balancing was way out and i struggled to get a decent constant idle to set them with took alot of playing with the remote idle adjustment knob.
The minute i put the screwdriver on the end of the balancing adjustment screw without turning the screw the bike would start reving up, i assume this is not normal i suspect possibly the carbs aren't mounted in the rubbers properly and my pressure on the screw is opening air leaks.
After persevering ive got the carbs balanced roughly near each other the idle's still crap so i did a quick test of spraying carb cleaner onto the tops of the carb rubbers on all but the 4th one the cleaner caused the engine to rev up so there's definitely air leaks there.
Does anyone know how much new rubbers are from cradley?
Also is there a gasket between the rubbers and the engine?
Does anyone have any ideas as to why the bike has started cutting out just from fixing an exhaust leak?
The bike has stage 1 dynojet needles fitted with the rest of the jets being stock sizes i don't know what the idle settings for the carbs are set to though i assume they can't be far out as the bike goes well enough once going just at standstill it's hit and miss.
Also when on choke the bike revs up to just under 4krpm is this normal, makes a hell of a racket with the scorpion can on there.
Sorry for all the questions can find my way round a car engine happily enough but bikes are still abit new to me
cheers
chris
Edited by CaNsA :- To make for easier reading.