ec 300 sudden power loss, wont rev

[2taddict]

Originally Posted by Fastboysparky

Just checked the power valve again, looks fine to me. There is a steel wire coming up from engine that moves the pv. This is connected via a locknut, then there is central bolt holding plate to pv spindle. Should there be anything else. It moves to full open as soon as you crack the throttle. Then bounces back when I let off.


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Yep sorry mate looks ok. The pin that holds the lock nut and wire onto the plate broke off on mine and caused all the dramas.

[Neil E.]

Time for a compression test. This doesn't tell you the whole story, but will give an indication if the motor is sound. Ten kicks with the throttle wide open should give 180 to 190 psi. Lower than 140 psi something is definitely wrong. Ground the plug so it sparks (or press the kill button to prevent sparking).

Maybe you have a stuck piston ring.

[spooly]

Im having the very same issue. .power just left suddenly, went pure flat ..my first thought was the exhaust fell off..then I thought carb.. Im going to replace my reeds and hopefully that solves my problem. .I seen one was chipped.. I hope u solve your issue mate and ill be awaiting your cure..

[spooly]

[Fastboysparky]

Have you ordered your reeds. I have found that they are the same as cr250. Would a small chip like that cause such a big problem???


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[spooly]

I haven't ordered um yet im waiting for my guy to ring me.. im only hoping that's my problem. I don't think there sealing properly either. . Im only eliminating the options like yourself. . Maybe someone with more experience can tell u if reeds like that would cause such an issue. . My only other option is electrical. .or base gasket. .or maybe a stuck ring that iv never heard of before but worth checking. .

[spooly]

A guy aslo told me check the muffler to make sure the centre pipe inside the muffler hasn't slipped offline .

[Fastboysparky]

I have had a price £44 for v force reed petals so I'm gonna change them. I've just borrowed a compression tester but the ecu I was going to borrow is from a 1998 model and has different plug. I will not be beaten.


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[Fastboysparky]

Reeds price was 44 pound. Not as it has come out above.


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[spooly]

I was quoted over £50 for the reed petals. . I probably could have got um cheeper if I shoped around but I wanted um before this weekend. . Fingers crossed now it solves my issue. .