Engine stop at 9500rpm - Honda Motorcycles - FireBlades.org
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post #1 of 11 Old 05-17-2007, 6:56 PM Thread Starter
 
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Engine stop at 9500rpm

I just both my first 900RR 1999mod, but the engine ”stops” at 9500 rpm, is that right?
The big red line doesn’t start before 1100rpm…
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post #2 of 11 Old 05-18-2007, 3:45 AM
 
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Re: Engine stop at 9500rpm

no its not right! sound like it may be a blockage inside one or more of the carbs. (it won't be fuel injected at that age). I'd drain the floan bowls (there is a drain screw on each). Also check the fuel level and that fuel flows freely from the vacuum tap on the tank.
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post #3 of 11 Old 05-18-2007, 3:48 AM
 
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Re: Engine stop at 9500rpm

I also remember a simular problem I had (1998 same bike though) which was the breather from the carbs was kinked. I can't remember now where exactly it was but check all the hoses under the tank and round by the airbox in case and be careful when refitting the tank that it does not pinch any pipes.
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post #4 of 11 Old 05-18-2007, 3:10 PM
 
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Re: Engine stop at 9500rpm

Maybe there is a rev limiter set at 9500rpm with an aftermarket ignition.
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post #5 of 11 Old 05-18-2007, 9:48 PM
 
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Re: Engine stop at 9500rpm

Plugged fuel filter, did the 99 use a fuel pump if so could be pump pressure low or regulator bad. Will it bounce off the rev limiter with no load on the engine? If so bet you have one of the problems above.
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post #6 of 11 Old 05-19-2007, 8:03 AM
 
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Re: Engine stop at 9500rpm

98/99 have no fuel pump, and no pressure regulator.

There is a vacuum tap on the tank and gravity feed to the carbs. The only filter iirc is in the tap where it fits into the tank and can be removed and cleaned (care not to dump fuel everywhere!). What emissions control is on the bike? Its not something we have in the UK, but was there EVAP or some such on these bikes (I have no idea if this could effect anything).

There is a breather on the tank too and if that were blocked or restricted in some way it could make a difference so worth checking all the pipes right through from the tank to the carbs inc all breather hoses, like I said above, and that fuel flows freely from the tank when the tap has a vacuum.
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post #7 of 11 Old 05-19-2007, 8:07 AM
 
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Re: Engine stop at 9500rpm

Electrics could be a consideration too - have the leads and caps and plugs ever been changed? The leads from teh coils can be changed but genuine caps are expensive - you can substitute some cheap ones that will fit down teh holes onto the plugs if only to test the theory before splashing out on a full set of Honda ones.
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post #8 of 11 Old 05-19-2007, 10:40 AM
 
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Re: Engine stop at 9500rpm

Sounds like a fuel starvation issue to me, If the fuel valve is the vacuum tap variety the membrane could be bad and it's not staying far enough open to get fuel to the bike.
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post #9 of 11 Old 05-19-2007, 11:46 AM
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Re: Engine stop at 9500rpm

Is it cutting out at 9500rpm's or just not revving any higher? Check your throttle linkage and make sure the carbs are fully opened at WOT.

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post #10 of 11 Old 05-21-2007, 5:15 AM Thread Starter
 
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Re: Engine stop at 9500rpm

Quote:
Originally Posted by Red Rider View Post
Is it cutting out at 9500rpm's or just not revving any higher? Check your throttle linkage and make sure the carbs are fully opened at WOT.
It is cutting out at 9500rpm`s
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post #11 of 11 Old 05-23-2007, 2:29 PM
 
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Re: Engine stop at 9500rpm

i've seen Fireblades with limited power by carbs air intake.
they are not 97 kw, so maybe that is problem, i don't know rpm they can reach
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