96 MXZ 670 clutch issues - Snowmobile Forum: Your #1 Snowmobile Forum
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post #1 of 5 (permalink) Old 01-02-2013, 06:26 PM Thread Starter
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Unhappy 96 MXZ 670 clutch issues

I just picked up a 96 MXZ 670 and when I got it the idle was way up at 3000 rpm.

Once I took it home I adjusted the rpm back to specs to find that the primary clutch is making weird banging sounds that go away once you rev it up. hence the high rpm setting by the seller


Initially I thought it might be the PTO bearings but I put my stethoscope to the engine and they are quiet.

I also noticed that the outer sheave has a bit of play in it It could be a worn bushing, It also makes a strange sound when the engine is killed.

It goes like stink and the clutch seems to be shifting fine but I have a 4 hour round trip coming up this weekend with our snowmobile group and I'm wondering if I should chance it or will this thing bomb on me? not really a fan of having a clutch self destruct at high RPM if you know what I mean.

What do you guys think??

96 Formula MXZ 670
96 Formula SL 503 RIP
93 Formula Grand Touring 582
90 Bravo 250LT (Sold)
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post #2 of 5 (permalink) Old 01-03-2013, 03:51 AM
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The TRA clutch is splined (outer half can be removed. The splines are wearing out on it and there is play on the clutch. It could last a day or a season.

1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month! (Lost in fire 4-7-13)
1992 Ski Doo Mach 1 original
2006 Ski Doo MXZ 500SS
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post #3 of 5 (permalink) Old 01-03-2013, 06:58 AM Thread Starter
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Thanks

Can it damage my PTO bearings? There does not seem to be vibration on the motor when running.

I'll take a chance and see how it goes it's better to be with a group then be by myself.

96 Formula MXZ 670
96 Formula SL 503 RIP
93 Formula Grand Touring 582
90 Bravo 250LT (Sold)
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post #4 of 5 (permalink) Old 01-03-2013, 07:34 PM
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No it won't. Let me know what you find. I have some TRA parts if you need them.

1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month! (Lost in fire 4-7-13)
1992 Ski Doo Mach 1 original
2006 Ski Doo MXZ 500SS
1999 Ski Doo MXZ600
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post #5 of 5 (permalink) Old 01-06-2013, 02:11 PM Thread Starter
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Little update

Yesterday I spent most of the daylight cruising with a group of 30 sledders on a 240Km round trip and i did not have one issue with the sled it ran like a dream and I had a great time.

96 Formula MXZ 670
96 Formula SL 503 RIP
93 Formula Grand Touring 582
90 Bravo 250LT (Sold)
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