Hi all, I've been doing all the odd jobs on the do-up Dragster 125 I bought recently, and apart from the back brake it's about ready for it's MOT. That's if I can get it started - it was running fine, then wouldn't start and then on Saturday it was running lovely for about half an hour while I warmed the cooling system up. I've had the plug out, got a good spark, but it doesn't even seem to be firing. I've changed the throttle cable and the carb slider moves fine so I don't think this is causing the problem. I know it's been asked a thousand times but I can't seem to find an answer - what are the standard carb settings (looking at these as a starting point). Also, how does the auto choke work - I don't know if this could be the problem but again if I can rule it out then all good. Any help or advice will be very welcome. Thanks.
Ignore the 50cc bit they all work on the same priciple As you can't get it running remove the choke and put 12v across the leads and see if it extends. You'll only get 12v from the scooter when it's running. The choke is on when it's retracted inside the unit and extends to close off when warm so unless it's jammed out it should always be "on" http://www.pedparts.co.uk/blog/automatic-choke-unit-50cc-mopeds
try a new plug there seems to be a lot of dodgy ones about, I know of 3 people who have had intermittent starting due to the plug in the last month
Plug's fine, got a really good strong spark on it. As I said it was running fine but now it's not playing - first thing I did was take the plug out, clean it and test it. Going to put 12v across the autochoke when I get home from work and see what's going on there.
Probably a fuel blockage so a carb strip would probably sort it assuming you are getting a good flow of fuel from the tank?
Took the carb to bits the day I got it, it had fuel leaking out of the top when it ran which turned out to be the float sticking. Good flow of fuel so that's not the problem.
Well I got home and thought I'd just have a go at the aircrew before looking at the autochoke. Wound it all the way in then about 1 3/4 turns out and guess what, it only bloody started!! Bit smokey but I'll live with that for now and get someone else to set it up properly.