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MickYork wrote:A few options, but all carb' related.
You're trapping fuel in your bellows and flooding. Some bellows have a drain on them to help overcome this.
Your pilot may be too large and/or your choke may be sticking and/or air filter may be blocked
90% sure it's carb' related.
CHRIS in MARGATE wrote:I assume it is a SH1/20 or perhaps 22mm Jetex.
First question:
Has it always done this or did it just suddenly start?
What modifications to the SX200?
Silly fixes but try a new spark plug. Take the fuel cap off.
Have you by chance fitted an inline fuel filter.
Your rings might be worn. You need a compression test.
rossclark wrote:With the hose off you should be able to see the plunger lift / drop by looking down the front of the carb as you pull the cable. You need to make sure it closes off properly when shut and that the cable has a mm or two of slack before it operates off the lever.
LammySX wrote:Hi, I am posting here as I think I have a carburetor/fuel problem.
Scenario
A modified SX200 starts first or second kick every time
After about 30/40 mins of riding if I switch off 9 times out of 10 it won't start. If switch off petrol and leave it half an hour and it starts on the first kick.
Very difficult to maintain tickover, always have to keep the revs up at traffic lights or it will die and I'll be stuck there for half an hour (;-) Sometimes I miss it and it dies, like a fuel starvation problem.
Initially thought it was flooding and got into the habit of switching off fuel for a few minutes before cutting the engine. Seemed to work for a while.
Stripped the carb, cleaned everything and blew jets with compressed air. Replaced float and a new red tip needle which was 1/32" longer than the one I took out. That seemed better but it's now gone back to a difficult hot start.
Drained the tank and cleaned all the crud out, measure flow 200ml per minute.
Update
I should have said, last week it was running at very high revs when I stopped. I didn't do anything, it resolved on its own
I am now thinking fast flow tap or new carb.
BTW if I am lucky enough to stop on a decent hill it bumps every time.
I am not thinking electrics at the moment
Any other suggestions?
Thanks
J
Regards
J
MickYork wrote:A few options, but all carb' related.
You're trapping fuel in your bellows and flooding. Some bellows have a drain on them to help overcome this.
Your pilot may be too large and/or your choke may be sticking and/or air filter may be blocked
90% sure it's carb' related.
CHRIS in MARGATE wrote:If your carb is adjusted correctly and your engine is revving too high at tickover and is slow to return to idle then you most definitely have an overly weak mixture that is more often than not caused by an air leak.
Your initial posting stated that you had a modified SX 200.
MickYork wrote:The choke adds more fuel, altering the ratio of fuel to air.......so you have either either too much air (air leak) or too little fuel (bigger pilot jet).
With the over rev' you mentioned previously this would point to an air leak.
An air leak can cause serious problems, with the potential of holing your piston.
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