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Discussion Starter · #1 ·
Hi Guys,

I've got two 1995 Mach 1 670's recently. Both in excellent condition.

One runs really well, very fast. The other runs but nowhere as fast.

Symptoms of under performing sled:

Chews up more fuel and oil then the other.
Bogs at low rpms
Can't get the Rpm higher than 6000 when full throttle
Engine was recently rebuilt
Compression is good in both cylinders
Occasionally but rarely back fires.

My gut tells me it's getting to much fuel.

Is there anyway to easy adjust the mixture level?

If not, anybody know a good ski doo mechanic in Hamilton area?


ZR rider
2,064 Posts
There are many adjustments that can be made on a roundslide carb. You may want to have it serviced if you don't know what you're doing. Personally, I'd just clean both of them and replace the gas. Sounds like you have some moisture in there.

19,291 Posts
I would jet one size smaller on the main jet, then run it again. If the plugs remain black, you can jet even smaller for that temperature and elevation. Plugs should be cardboard brown. Black means too rich which robs power and wastes gas.
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