starting problem

[Chimpboy74]

I've posted before on my current issue but the thread title was misleading so I have started a new thread

So my Li125 had just had a new spark plug and HT lead and cap fitted. All was running fine but I left it sitting for two weeks and then it wouldn't start.

The first time I tried it started first kick but immediately cut out and wouldn't start again.

I checked spark and HT lead and all seemed Ok. Fuel Tap is flowing fine on reserve and normal positions. I replaced fuel line (managed to split it whilst taking it off!) for a clear one and drained all petrol out in case there was a problem with it. Drained fuel looked pretty clear, no crud or anything.

I just topped it up with fresh petrol and 3% putoline 2 stroke. It had sat for a couple of weeks again (just too busy to tinker) and, again, it started first kick and ran for about 5 seconds before slowly stopping (in spite of holding throttle open) and now there is absolutely no sign of it getting near starting again.

So I was hoping someone might have some ideas as to why after sitting for a couple of weeks it starts but then cuts out? And then it doesn't get close to starting unless its been left for a good while. I'm pretty new to this so would appreciate any thoughts. It seems like a fuel supply issue but don't want to make any assumptions! I'm guessing there is a supply issue in that some fuel is getting through but not enough to keep running?

I don't think it is flooding as I have flooded it before and the petrol has poured out the exhaust when I moved it and nothing is coming out this time.

should I be cleaning carb out? if so, what do i need to watch out for? I've got the spanners manual which is pretty good but any top tips would be appreciated!

[Scooter Paul]

What ignition system do you have? Have you checked that you have a Spark after it has stopped running? When you take the plug out is it wet or dry. Some more information please.

[Chimpboy74]

Hi yes. Definitely got spark and plug is wet.

[Toddy]

its not Badly flooded is it after trying to start it ?

have you got the ignition switch / kill switch wired in if so disconnect in case it has an earth fault

does it Fire at all when trying to start ?

[Scooter Paul]

Hi yes. Definitely got spark and plug is wet.

I had a bike that would start from cold and then die like yours. There was always a spark but not a strong one. The plug was wet. It turned out to be a faulty coil, points ignition, under compression the spark would fail. New coil and it ran like a champ.

[matthew]

it's flooded.

[St George]

Just had similar issues on my new engine, good spark ( I thought ) Changed the CDI Unit for a new spare one, started first time : )

[Chimpboy74]

Hi. Thanks for all the suggestions.
I don't think it is flooded as I have flooded it before and quite a bit of petrol came out exhaust and I'm seeing nothing this time. That said I'll give it a go with choke off to see if it makes any difference.

On the kill switch cable I havent tried that. Another thing to check off. Thanks. If I leave it sitting for a couple of weeks it will start but then slowly cut out after a few seconds. It doesn't even sound close to starting again after that until it has sat for a while.



I do have a replacement CDI I can try but someone else suggested it was unlikely to be that. That said. Open to trying anything!