Question about 2000 Honda CBR 929 RR Fireblade

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Engine breaking down under throttle, what would cause this?

Have replaced filter, would it be plugs or what else? Think it got dirty fuel through from servo.

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Happens at high or low rpm?
If
at low, may be the vacuum pump of the fuel system
is inexpensive and easy to install

Posted on Jan 08, 2014

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Posted on Jan 02, 2017

rselvy
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SOURCE: engine miss at 45-55mph, no accleration with throttle response,

Anytime a bike sits for that long you stand a chance of fuel system problems. It sounds like you may need to "boil out" the carburetors and of course resynchronize them with vacuum gauges when you put it back together. You can also use a mercury manometer for synching the carbs. My guess is you have varnish still in the float bowls that is causing erratic running and perhaps the vacuum operated slides are not working correctly.

Posted on Nov 30, 2008

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SOURCE: new crf250r breaks down at high revs since new

Thats not normal. You could get a bike off the show room floor and completely skip the break in period and it would run wide open. If your bike wouldn't rev past quarter throttle there is something wrong. With a blackened silencer and a motor that dies at quarter throttle I'd say you've got a problem with your injection system flooding your motor with fuel. I run 3 warm up and cool down rotations and go ride like normal. After 4 tanks of fuel your bike is more than broken in. If you aren't familiar with the injection system take it to the dealer and get someone to look at it. If you bought it new it should be covered as a manufacture defect.

Posted on Jul 27, 2010

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1 Answer

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being a certified mechanic has its advantages. there are multiple causes for that problem: lack of air or lack of fuel.
make sure the air filter is mostly clean.
check throttle plate (where air filter tube goes into motor), most likely black with soot and carbon. clean with tooth brush and gas, wipe off with clean rag. repeat ultil CLEAN.
low air flow past plate when closed (idle) will cause stall condition.
dirty throttle body is a common problem with lots of cars. causes engine stall.

dirty fuel filter will also cause this problem.. low fuel pressure at idle.

I also believe that your car is equipped with an idle air control valve. (regulates a bypassed air flow to motor at idle) this valve may be stopped up or non-functional. have local shop take a look, but there are ways to check valve if you consider yourself mechanically inclined

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Hope this Fixya's problem!
Paul 'W'
Onyer~EDson(:0) {#><U.K.

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