anyone good with 2 strokes (keith needed)

[houlsby]

hi, my powervalve keeps randomly shuttin or cutting off. wouldnt mind but when the back wheel locks backing in to a corner its quite scary! it warms up then it seems to jump and cut out!

[Kickstart]

Hi

The power valve would certainly not cause the back wheel to lock up. Biggest amount it would loose is around 10hp if it closed close to the red line, which is a lot less than just shutting the throttle fully and that certainly does not cause the back wheel to lock.

Think you would need to check the connections from the servo motor to the control unit (which lives under the pillion seat).

If it really is locking the back wheel up then it is probably seizing up.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[stinkwheel]

Have you got resistor plugs in it?

The powervalve on my old RD350LC2 used to flutter if you fitted non-resistor plugs. Something to do with radio interference confusing the powervalve black box.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[houlsby]

sorry i mis wrote the weel locking. i mean it sort of slows if you follow? it feels like im backing into a corner with back brake on gently. please dont tell me its gunna seize! ive just had a new engine! nooo! can i sue the dealer or aprilia! really hope its not gunna seize, its just had new bearings and 2k before it had a new engine they told me.

[Kickstart]

Hi

If it was seizing you would know about it, and it would have done it in style by now.

Are you certain the power valve is really opening and closing randomly? It will be open up to 2500rpm, then closed from there to about 8000rpm where it opens again properly for top end power.

Has the bike had the cdi mod done to remove the large flat spot between 5000 and 6000rpm?

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[houlsby]

no its a totally stock bike. the valve must be closing, its as if im pulling the clutch in then putting the back brake on, really wierd!

[mchaggis]

Your rear brake isn't dragging/ stuck on or anything silly is it?
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Discovering the delights of Hammerite and a 3/4" brush.

[houlsby]

no, theres loads of black shite on my wheel i just noticed, not a clue whether its the chain lube i put on or my scott oiler gettin cought in my wheel tho

[mchaggis]

If it's not chain lube/ scottoiler/ burnouts, then brake dust is a prime cause of filthy blackness on wheels. I'm not sure if the problem is quite as bad on a bike as a car, but it's a possibility.

Does the brake disc get very hot when you've been out for a run on it? I'd check your pads for excessive wear too, even it the problem isn't your brake dragging, you want to make sure you're not about to run metal on metal.
____________________
I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.

[Kickstart]