› Forums › Technical › Two Stroke: Help needed › TS 250 gear noise
- This topic has 5 replies, 2 voices, and was last updated 3 years, 6 months ago by Keith Wilson.
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April 22, 2021 at 7:42 pm #14011Keith WilsonParticipant
My super 5 engine clutch side is making a lot of noise.i suspect it’s the gear behind the clutch. I know there are shims of various sizes to take up the end float. Can this job be done with the engine on the bike? If so how do you measure the end float to use the correct shim? Any help would be appreciated.
Keith. -
April 23, 2021 at 11:48 am #14012Andrew JamesParticipant
You can shim the crank end float with the engine in the bike easy enough. You need to set up a dial gauge to measure how much end float there is and then measure the shim you have and get a thicker shim to “correct” the end float back into tolerance. I had a nose which was worse when I pulled the clutch lever in indicated excess end float was causing the primary drive gears not to mesh cleanly. The MZ manual is easy enough to follow if you have access to the right tools to measure the end float and existing shim and to remove the clutch.
I’m not sure but believe a more consistent “gearbox noise” may be because the primary gear itself needs shimming but I haven’t done that job, my noise was resolved when I got the crank end float in tolerance.
If you haven’t got access to an MZ manual I could email an extract to cover shimming the end float
Hope that helps
Andy
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April 23, 2021 at 12:34 pm #14013Keith WilsonParticipant
Thanks for the information. I have a manual thanks.will have to get a dial gauge before I remove the clutch.thanks again.keith.
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April 29, 2021 at 8:41 pm #14028Keith WilsonParticipant
I have looked at the primary drive and all seems ok.ireplaced the bearing in the clutch cover.still have the knocking rattle? When clutch is disengaged it is still there.could it be the small end bearing? The bike had a rebore 5000 miles ago. The noise has increased the past 200 . Any thoughts?
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May 11, 2021 at 1:59 pm #14072Andrew JamesParticipant
Sorry can’t offer any advice on that one Keith, adjusting the end float into tolerance sorted my clutch noise which was at its worse when the clutch lever was pulled in. It would appear you have a different issue to explore
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May 11, 2021 at 5:55 pm #14075Keith WilsonParticipant
Thanks for your help.i have since stripped the engine down and discovered the big end was at fault.large amount of play. I have a new crank installed and took care to check the end float for the primary drive.
My next challenge is to get the engine to start! I have a 12v vap system fitted which worked fine.i have a spark and the carb is cleaned maybe the timing is out?
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