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Arctic Cat: 1M 2001-2005, all models in the Mountain Cat / 1M chassis
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Old 12-29-2018, 11:51 AM
ac4life ac4life is offline
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Default 05 975 king cat issues

I'm having a heck of a time diagnosing an issue with my 975. It has no 'pull.' will rev to about 7600 rpm but the power feels about like a stock 580.

The clutches are in good shape and were spotless when I put them in. New springs in primary and secondary. I have tried 4 different clutch weights and it won't rev higher even dropping from a 67s to 63s... Have also ran 70s and 68s with same results.

120/320 primary
Slp purple in secondary on lightest setting
53 degree helix

I'm trying 19/45 gearing.

Carbs all have new jets and needles. Running 360 pto and 370 mag for mains. 35 pilots. Thundercat needles on middle clip. Plugs are good color.

Engine is fresh. Had equal compression numbers on both cylinders.

Is it weird that it runs exactly the same if I switch the spark plug wires?

I don't know what my fuel pressure is.

It starts and idles great. Clutch engagement is smooth.

I bought it this summer with a 862 still in it and built it from the bulkhead up so I have no idea how the stock engine ran.

I'm hoping someone will see this that has maybe had a similar problem. I'm stumped as what to do.

Edit: running a speedwerx single and speedwerx can. I dont have a stock pipe laying around to try to know if that is part of the problem or not. Another thing to add is that my pto egts are way higher than my mag side. Probes are in y pipe. Koso gauges.

Last edited by ac4life; 12-29-2018 at 12:12 PM.
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Old 12-29-2018, 01:00 PM
ac4life ac4life is offline
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My primary isn't shifting out but I'm not sure if it is a cause or affect.



The engine just doesn't sound quite right.

Edit: forgot elevation. Running it in fields at 5300 ft. Ride from 6-9 mostly.

Last edited by ac4life; 12-29-2018 at 01:07 PM.
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Old 12-29-2018, 01:11 PM
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If you put the track on a stand and rev it, will the clutches shift out all the way?

What elevation?

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Old 12-29-2018, 02:57 PM
ac4life ac4life is offline
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I must have been editing my post while you were typing yours ��. Testing in a field at 5300. Ride 6-9 many of the same places you do. These cylinders are off of the 975 dragon you guys built! I have thought about calling your dad but didn't want to burden him. He has already helped me out a ton!

It does fully shift on a stand. The engine sounds healthy as well....
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Old 12-29-2018, 03:22 PM
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Quote:
Originally Posted by ac4life View Post
I must have been editing my post while you were typing yours ��. Testing in a field at 5300. Ride 6-9 many of the same places you do. These cylinders are off of the 975 dragon you guys built! I have thought about calling your dad but didn't want to burden him. He has already helped me out a ton!

It does fully shift on a stand. The engine sounds healthy as well....
I'm at his place today, I'll ask him what he thinks!

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Old 12-30-2018, 07:02 AM
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Had an issue just like that once. Ended up being the tps. Unplug it and see if it runs better. If it does then it is bad or out of adjustment.
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Old 01-17-2019, 10:01 PM
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Did this ever get worked out? Does it have a timing key for extra advance?
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