smart51
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| posted on 13/1/06 at 05:44 PM |
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BEC clutch slip
I am getting a bit of clutch slip at full throttle. For example when in 6th at 5000 RPM, if I open up the throttle, it revs up by 500 RPM then jumps
1000RPM and holds at that speed until the car catches up, then it will continue reving normally.
I have fitted new clutch plates 400 miles ago plus a barnet pressure plate and springs. It has always behaved as described, since new and will occur
as described at whatever engine speed you happen to be going at.
The clutch action is fine when pulling away or changing gear and is fine at part throttle.
Is this normal for a BEC or is mine misbehaving?
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k33ts
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| posted on 13/1/06 at 05:47 PM |
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are you using car oil in the engine
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smart51
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| posted on 13/1/06 at 05:50 PM |
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No. Bought oil that said Bike Oil on it. Castrol I think. Halfords had that or Halfords Bike Oil.
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Guinness
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| posted on 13/1/06 at 05:55 PM |
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Certainly sounds like clutch slip. Are you using fully synthetic or part synthetic oil.
Is the oil level right, some bikes can suffer clutch slip on overfilling.
Buy cheaper tyres, less grip!
Mike
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progers
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| posted on 13/1/06 at 07:30 PM |
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Definitely sounds like clutch slip. I do not know what frictions you are using but I have found that Yamaha frictions are much better than Barnett
Kevlar ones for example.
To get a bit more pressure on the clutch plate, one trick (told to me by a sidecar racer) is to put a sump washer under the spring to compress it a
little more. Since I did this I've not experienced any clutch slip at all including using both synthetic and semi synth oils.
Hope that helps
Paul
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ChrisGamlin
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| posted on 13/1/06 at 07:50 PM |
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Also make sure your clutch cable is disengaging properly with a few mm slack and no sticking points, and also make sure you're not subconciously
resting your foot on the clutch (easily done)!
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smart51
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| posted on 14/1/06 at 03:13 PM |
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Foot not on clutch pedal at all so it isn't techneque!
I drained my oil and poured back into the original container. 3.1 litres is a bit much. I poured 3.7 litres back in as per Sir Haynes. This has
eliminated slip at accelerations starting at 4000 RPM in 6th and reduced the amount of slip when accelerating from 5000 in 6th. Still a bit more
improvement needed.
My clutch cable is adjusted so that there is a bit of slack when the clutch pedal is pulled back. The clutch springs pull the pedal back but the
clutch release arm spring doesn't. Is this OK?
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