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I would like to have some opinions from the experts on plug reading here. These are out of our 1996 670 Summit with Jaws pipes. The plugs were almost new and I cleaned them with Carb cleaner and a wire brush before the test. This is what they looked like after 3 runs. Each run was longer...

Can anyone tell me the cranking compression of a 96 summit 670 at sea level? Or what should we have in a fresh engine at 4200 feet? We may mill the head or what about base gasket thickness and port height location? We have some room in the piston to head area as we are slightly over .065" I...

670 High Altitude Compensator HAC Calibration I know many are in favor of removing the HAC when it fails and jetting like a model with out HAC. That may be the best in most cases, but I wanted to share something here I learned by reading on another Snowmobile forum. You can indeed actually...