Scorpa Easy 250 Odd Thing!

[madcr500]

The last time i went out on it about a week ago it ran fine then tonight, it wasnt running well.

The tickover was higher than usual but it wasnt smooth like normal, it sounded like it was four-stroking if you know what i mean. It sounds far too rich.

When going down a steep descent the revs dropped and i had to rev it to keep it running.

When i press on the choke the revs drop to nothing but when revved it feels crisper.

On the roads on the way back when going downhill i pulled the clutch in and the engine drops to a high tickover, when i revved it a little (with the clutch in as i was going along) the engine surged to a very high tickover.

I have 2 ideas as to why, see what you think.

1. Choke is sticking on a bit which has happened once before on this bike.

or

2. Yesterday i fitted a new air filter. The old one was in the bike when i got it and was knackered but i kept it lightly oiled. When i fitted the new one i gave it a damn good soaking in filter oil and overdid it a bit. I squeezed it out and put it in. Could too much oil be restricting airflow and causing a rich mixture.

Thanks in advance for any help.

Marcus

[copemech]

I would give the carby a good cleaning, doubt too much oil is the thing! Condensation in the bowl will do funny stuff!

[jse]

The last time i went out on it about a week ago it ran fine then tonight, it wasnt running well.

The tickover was higher than usual but it wasnt smooth like normal, it sounded like it was four-stroking if you know what i mean. It sounds far too rich.

When going down a steep descent the revs dropped and i had to rev it to keep it running.

When i press on the choke the revs drop to nothing but when revved it feels crisper.

On the roads on the way back when going downhill i pulled the clutch in and the engine drops to a high tickover, when i revved it a little (with the clutch in as i was going along) the engine surged to a very high tickover.

I have 2 ideas as to why, see what you think.

1. Choke is sticking on a bit which has happened once before on this bike.

or

2. Yesterday i fitted a new air filter. The old one was in the bike when i got it and was knackered but i kept it lightly oiled. When i fitted the new one i gave it a damn good soaking in filter oil and overdid it a bit. I squeezed it out and put it in. Could too much oil be restricting airflow and causing a rich mixture.

Thanks in advance for any help.

Marcus

Marcus,

When oiling the filter, take some paper towels and "blot" the filter to soak up excess oil before re-installing it. Oil will collect at the bottom of the filter (it is an "open celled" foam, kinda like a bunch of little caves connected together), which incidently is where the intake holes for the imulsion tube and low-speed circuits are.

Start with whatever you did different last, before the symptoms occured. And, Copey's right, you want to clean and adjust the carb to eliminate that as a possibility.

___Marcus,

I can't quite remember, does your bike have the Rotax engine?

Jon

Edited May 2, 2008 by JSE

[max1956bikes]

sounds like crank seal problem to me.

[madcr500]

Sorted the problem out. It was the choke sticking slightly. I stripped the carb down and everything else was fine. A small amount of water in the bottom of the float bowl but not enough to cause a problem.

Running like a dream again now. Thanks for the help.

Marcus.

BTW Yes it is a rotax engine.

[copemech]

Sorted the problem out. It was the choke sticking slightly. I stripped the carb down and everything else was fine. A small amount of water in the bottom of the float bowl but not enough to cause a problem.

Running like a dream again now. Thanks for the help.

Marcus.

BTW Yes it is a rotax engine.

You cannot overlook water in there, ANY water! It will drive things goofy!