gasgas ec300 engine problem

[jens]

hey,

I bought a gasgas ec300 from 2002. I been riding it 3-4 times but now i got some problems with my engine.
But now the engine got trouble to stay on when im not giving gas.
ive been searching for a while and i found out that when i remove the cover off the power valve the engine runs perfectly.

anybody got an idea what the problem could be?

(sorry for my bad english i speak dutch)

Jens

[GasGasDreamer]

Originally Posted by jens

But now the engine got trouble to stay on when im not giving gas.

Your pilot jet is dirty or clogged.
Another very weird thing happened to me once.
I adjusted the air / fuel screw while the bike was running.
All was well for an hour or so and then it started acting like there was some weird erratic electrical problem.
I replaced the plug and it disappeared.
But i am assuming that you changed the plug, cleaned the airfilter, didnt leave a towel in the intake boot, have good clean gas, and had sure your stator is dry..

[stainlesscycle]

Originally Posted by jens

i found out that when i remove the cover off the power valve the engine runs perfectly.

check for restriction in pipe/silencer

[jens]

Originally Posted by GasGasDreamer

Your pilot jet is dirty or clogged.
Another very weird thing happened to me once.
I adjusted the air / fuel screw while the bike was running.
All was well for an hour or so and then it started acting like there was some weird erratic electrical problem.
I replaced the plug and it disappeared.
But i am assuming that you changed the plug, cleaned the airfilter, didnt leave a towel in the intake boot, have good clean gas, and had sure your stator is dry..

yes i did check all of that. the problem also started while we where doing a trip. i changed the plug about 3 times.

[jens]

Originally Posted by stainlesscycle

check for restriction in pipe/silencer

i will check this tomorrow. it might be possibel and it would also explain the problems.

[GasGasDreamer]

Originally Posted by jens

i found out that when i remove the cover off the power valve the engine runs perfectly.

do you mean you ride it with the cover off?

[GasGasDreamer]

Originally Posted by stainlesscycle

check for restriction in pipe/silencer

i dont know if this can happen on mc but on cars the exhaust can look great but in reality the second inner wall collapses and the car will run for a little bit then die.
on a car you can use a vacumm guage to check for this. at first reading is normal then it starts to drop and continues to drop until it dies.

i dont thing the expansion pipe is a double wall.
the silencer should be easy to take apart and see.

best of luck.
please report back..

[jens]

Originally Posted by GasGasDreamer

do you mean you ride it with the cover off?

no i dont ride whitout it. i just whas searching the problem when i got home, and i thought there whas a problem whit the powervalve so i removed it and started the engine. then he whas running fine but when you close it he dies again.

[jens]

Originally Posted by GasGasDreamer

i dont know if this can happen on mc but on cars the exhaust can look great but in reality the second inner wall collapses and the car will run for a little bit then die.
on a car you can use a vacumm guage to check for this. at first reading is normal then it starts to drop and continues to drop until it dies.

i dont thing the expansion pipe is a double wall.
the silencer should be easy to take apart and see.

best of luck.
please report back..

yes, you explain kinda what happends. il remove the silencer tommorrow and check it out. tomorrow i wil report if this whas the problem or not.

[HuskyDude]

Isn't there a little vent tube coming from the Power Valve box? That could be plugged.