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Moto 4 clutch questions

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My wife rides a 86 Yam moto 4 YFM225

We picked up for cheap and it runs great.

Im a big dude and it actually really rips for being what is nowadays a smaller quad. I noticed the clutch is slipping. It takes a couple seconds to really engage. I think the previous owner used car motor oil which may cause it but it may be worn out.

My question is that in owners manuals and other forums, there are mentioned adjustments that can be made to them but is this just for manual clutches as mine is an auto clutch. I ordered new clutch parts and will be using 4 stroke oil for sure.

Has anyone reclaimed a clutch by just changing to proper oil?

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it might help if not too far gone if that's what it is. you could need a drive belt too. there is an adjustment for the clutch on the throttle side of the bike on the motor/trans. it looks like a nut with a slotted screw thru the middle, not sure if its left or right to put more tension on it ...

here is the service manual link ....


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Yes I agree with Oxy. My 86 Moto4 200 has an adjustment for the autoclutch . Its by the foot brake. Like Oxy said its a slotted screw with a jamnut on it. Dont adjust more than a few degrees at a time. You can burn up the clutches if you adjust it too much.

I ran 10-30 in my moto4 for years. I was misinformed. I switched to 4 stroke oil and it made quite a difference in the shifting and engagment.

Sent from my SGH-T989 using Xparent Blue Tapatalk 2

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