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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.

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Old 11-11-2017, 02:36 PM
Mika Mika is offline
Join Date: Nov 2017
Posts: 2
Default EC300 suddenly low on power but then returns back to normal


I have a EC300 2008. With some strange enginge behavior. A couple of times i have experience suddenly power loss and a change in engine sound. First I thought i lost the silencer or the exhaus gasket. But they semes to be fine.

Then i notice that it can go back to normal if I do a couple of more runs. You can listen to the sound i the clips on you tube.

The first is very loud with bad power output.

The other is normal power.

Between these clips i only did a 100m run.

What do you think can cause this?

Regards Mika

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Old 11-11-2017, 02:49 PM
gasgasman's Avatar
gasgasman gasgasman is offline
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Join Date: Jul 2006
Location: Pearland Texas
Posts: 4,036

Check the power valve. It's sticking.
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Old 11-13-2017, 12:54 PM
Mika Mika is offline
Join Date: Nov 2017
Posts: 2

Ok, thank you!

When it is sticking can it easy be lubricated from the small hatch to get it to work or do you think the entire power valve need to be removed and greased or changed?

Regards Mika
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Old 11-13-2017, 02:01 PM
PEB PEB is offline
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Join Date: Aug 2006
Posts: 1,148

It likely needs to be removed and have all the carbon buildup removed form it. The part of the cylinder that houses it is also likely to be fouled with build up as well. htis would be a logical point to do a top end, clean the power valve and such and start fresh.
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