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Old 07-Sep-2006, 01:49 PM
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beancounter beancounter is offline
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SP4 not revving

Out for a bimble on the SP4 today, everything fine and dandy except that the bike wouldn't rev beyond about 8500 rpm. No other problems, no funny noises, water temp absolutely fine at 70-75 deg.

Anyone got any ideas?

Thanks

BC
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Old 07-Sep-2006, 01:51 PM
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fuel filter ?
blocked breather ?
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Old 07-Sep-2006, 02:02 PM
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Try twisting the throttle a bit more?
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Old 07-Sep-2006, 02:23 PM
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beancounter beancounter is offline
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Quote:
Originally Posted by keefer
fuel filter ?
blocked breather ?


Interesting - why would a blocked fuel breather prevent the bike from revving?

I have to take care not to overfill the tank with fuel as it occasionally seeps out of the filler cap, so there may be a problem with the breather.
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  #5  
Old 07-Sep-2006, 02:28 PM
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If the tank is not open to atmosperics and the pump is running it could cause the tank to partially vacuum. stopping the fuel from going to the fuel lines 4D
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Old 07-Sep-2006, 07:04 PM
twpd twpd is offline
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I concur with the fuel filter theory. IME a blocked breather is more likely to cause the engine to stop or splutter as it simply eventually fails to get any fuel due to the vacuum that builds in the tank.
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Old 07-Sep-2006, 09:55 PM
bitchinSP4 bitchinSP4 is offline
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I had something similer happen to mine, it just would not rev. I was high up in the Alps at the time. Stoped for fuel a loud hiss as I opened the cap after that It was much better. After that I left the breather off. No probs.
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Old 07-Sep-2006, 09:58 PM
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DSC Member Jools Jools is offline
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On a T8 the breather valve is in the pipe that comes out of the top of the tank...it's just a push fit so it would be easy to put it on frack to bunt.

Just a thought...

From the bloke who still hasn't sussed his spluttery ST


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Old 08-Sep-2006, 06:25 AM
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It's probably just getting a bit old... time to get a new one... I'll take that one off your hands for a nominal fee

Cheers
Martin
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Old 09-Sep-2006, 11:58 PM
pguenet pguenet is offline
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If the problem goes worse and worse, you may want to change the rubber hoses in the tank. I had that happening to me once on a 916, took a month to diagnose the problem. There was a tiny split in one of the hoses in the tank. I would leak fuel back in the tank. Result, not enough pressure in the injectors and fuel starvation as soon as I was opening the throttle.
p
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