Help with 2004 Husky TE250 not starting

[bodge it]

I have a 2004 TE250 that will not start. It stopped after a short trip down the shops and has never started again.

I have checked the following:-
Fuel, took of carb and checked that fuel was being squirted into cylinder, and blew out jets with and air line,

spark (by putting plug on the exhaust and watching spark)
I have poured petrol directly into cylinder, heated up spark plug with blow torch, and tried to start it, only get a muffled back fire.

I have stripped the clinder head down, checked the valves, I have reseated them (not that they needed it) and redone the valve timing. replaced cylinder head gasket. checked the valve clearances.

Checked the carb feedback resistance into the CDI unit, OK. checked the gearchange feedback into the CDI unit, checked the coil resitance and earth connections, all OK.
I've replaced the HT lead, spark plug cap and spark plug


I have checked that the flywheel has not twisted on the crank, (only by manually trying to twist it by hand).

I hate being beaten by things I should understand (which obviously I don't)



Does anyone know how to check the ignition timing or any other sensible suggestions.


last resort will be to give in and take it to a mechanic.

 

[folkbiker]

A pal of mine had same sort of symptoms with a KTM 450 turned out to be a sheared woodruf key on the crank ,the flywheel had only moved a gnats cock hair but it was enough.

 

[bodge it]

Thanks for that, I'll pull off the rota and have a look, it's probably the only thing left.

 

[Losttheplot]

Have you checked the rubber manifold between the carb and the cylinder head?

I had one of these split on an old husky ( which ruined the mixture). the split wasn't big, but was enough to prevent the bike from starting..

 

[bodge it]

Thanks for the feedback.

A husky mechanic asked me what pressure I had in the cylinder, he said anything under 80 psi and it wont start, I tested it and had 50psi. Stripped it down for the third time and found that the piston rings had seized in the piston, i.e not expanding against the cylinder. Got a piston kit (which is a new piston and rings), put it in and it bloody started first turn of the starter. Simples.


Talk about learning curve.