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Old 01-04-2013, 05:31 PM   #1
dshuman
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Rev limiter

This is the first motorcycle I have had that will hit the rev limiter in top gear. Is it safe to move it up to 10k?
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Old 01-04-2013, 05:52 PM   #2
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Its definately been done. Unless you plan on replacing internals (i.e cams, piston heads, piston valves, valve springs) before you do it, it is not reccomended. You would just be asking for trouble IMO. Having an engine detonate at 140mph would not be cool.

Why not change pulley sizes?
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Old 01-04-2013, 06:05 PM   #3
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I wouldn't do it. I hear the oil pumps like to cavitate above 9,000 rpm . and if you have the stock cams then there's no need to raise the limiter. Hp starts to fall off about 8,000 rpm ..IMHO
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Old 01-04-2013, 06:17 PM   #4
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It's been mentioned here before that the rev limiter is set to 200rpm less than what the stock valve springs can handle.
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Old 01-04-2013, 07:58 PM   #5
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Thanks for the advice, what kind of difference will this make in the lower gears/lower rpms; and what will I gain for top speed?
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Old 02-02-2013, 12:57 PM   #6
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Quote:
Originally Posted by pScyko View Post
It's been mentioned here before that the rev limiter is set to 200rpm less than what the stock valve springs can handle.
Anyone know how mutch rev bee-hive springs can handle ?
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Old 02-02-2013, 07:12 PM   #7
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Originally Posted by tor2502 View Post
Anyone know how mutch rev bee-hive springs can handle ?
there's a lot more then valve springs that go into a high rpm engine. Oil pump, rods, piston pins, even the valves themselves. parts start to flex when you push them beyond what there designed to handle.
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Old 02-05-2013, 07:42 AM   #8
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Quote:
I hear the oil pumps like to cavitate above 9,000 rpm
Interesting, any more details about this?
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Old 02-05-2013, 10:07 AM   #9
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re subbed. I am only vaguely familiar with the concept of cavitation. I know in aircraft it is detected by measuring vibrations.
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Old 02-05-2013, 11:42 AM   #10
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Quote:
Originally Posted by pScyko View Post
...I am only vaguely familiar with the concept of cavitation. I know in aircraft it is detected by measuring vibrations.
Cavitation in a fluid pump refers to a condition when bubbles form and then collapse in the fluid on the inlet side of the pump due to a low enough pressure to cause the fluid to vaporize. When this occurs the pump can no longer pump fluid efficiently and, for some types of pumps, the shock waves (vibration) produced as the fluid bubbles collapse can damage the pump.
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Old 02-05-2013, 12:31 PM   #11
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I don't think the oil pump is ever an issue 10k RPM. Plenty of guys on the forum run a 10k rev limit - valve springs are another story.
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