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Is my clutch set correctly?

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_Chris_
Nitrous Nuisance



Joined: 25 Apr 2011
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PostPosted: 10:23 - 31 Mar 2012    Post subject: Is my clutch set correctly? Reply with quote

I think I may have an issue with my clutch, but I'm not sure.

I have a gz125, when I select 1st gear from a dead stop, the bike jerks a little bit, obviously with the clutch lever fully down to to handlebar.

Revving the engine doesn't seem to do anything, I certainly doesn't feel like the clutch is engaged and transferring any power to the wheels.

Is this normal, and the 'jerk' is just the gear being selected? This is my first bike, and I don't know anyone else with a bike to test on.

cheers
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Usher4566
Spanner Monkey



Joined: 29 Apr 2011
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PostPosted: 10:29 - 31 Mar 2012    Post subject: Reply with quote

Has it been in regular use ?
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P.
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 10:34 - 31 Mar 2012    Post subject: Reply with quote

1st gear on all my 125s was a clunky one. What happens if you select 2nd instead of first?

I'd consider it to be normal, but a big jerk forwards would be an issue. Usually a big clunk and a little tap forwards is normal...at least on all my 125s
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Taught2BCauti...
World Chat Champion



Joined: 12 Jan 2012
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PostPosted: 11:04 - 31 Mar 2012    Post subject: Reply with quote

A small 'clunk' is normal - this is caused by the viscous coupling effect of the oil in the gearbox, also known as 'oil drag' which has a tendency to cause parts of the gear-train to rotate, even though they are not being directly driven by the engine.

This wouldn't happen if there was no oil in the gearbox, so maybe it's a good sign Smile

If you hold the clutch in for longer and make sure the engine rpm is as low as possible before selecting 1st gear, the 'clunk' should be less noticeable. It should also be less clunky when the engine is hot.

When coming to a temporary stop, try to select 1st gear while the bike is still rolling forwards. Also, find a downhill section of road and try selecting 1st gear while rolling forwards - again, this should make it less noticeable.
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EazyDuz
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Joined: 11 Apr 2011
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PostPosted: 11:10 - 31 Mar 2012    Post subject: Reply with quote

i have a gz125 as well, and it jerks forward a bit if the engine is quite cold, its due to the thickness of the oil, if you put the front brake on, put it in 1st, push the clutch lever in all the way and rev the bike it sorts it out.
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_Chris_
Nitrous Nuisance



Joined: 25 Apr 2011
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PostPosted: 14:47 - 01 Apr 2012    Post subject: Reply with quote

Cheers guys, looks like it's just the thickness of the oil/engine temp Very Happy

Rode it out today, after a break for some food, the still hot engine went into 1st without (any noticeable) jerking.

Still got a lot to learn Cool
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