1973 arctic cat panther 340

20

Asked by Sep 27, 2017 at 07:52 PM

Question type: Maintenance & Repair

Well I mean it's not a car but it's got an
engine and here's my question so it's just a
mixed gas fan coold 340 in it, fan is fully
functional. What's going on is that it runs
great for about 15-20 minutes then it starts
bogging and if you let off the throttle it will
shut off, after it shuts of you will not get it
started until it cools off. So I was thinking
maybe head gaskets, maybe warping the
gasket at high temperatures  marking it
lose compression. But I haven't really torn
into a snowmobile before so what do you
guys think?

1 Answer

104,425

That sounds like it's overheating, have you checked the air flow cowlings for blockage and the fins on the cylinder head, make sure they are clean and open. Those old machines when they blew a headgasket they would not even start. You could try pressurizing the cylinders and see if you hear air escaping around the gasket or even down around the rings, if it got hot too many times the rings can loose the tempering so then they won't hold compression. HTH

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