If you have a low hours engine, then maybe you can get by, but if has a lot of miles and time on it, you may want to worry about this. I hope you or someone checked the cylinder bores for this, because putting new rings into a oval bore will give you poor compression and probaly engine failure down the road. The original piston and rings kinda set in to this and for the most part can live together ( if left alone) this way for thousands of miles more. After a 1,000 or so miles on a 2 stroke engine ( especially an air cooled one) the cylinder gets a little out of round. You have to be careful when removing the old base gasket, you don't want to gouge any metal in the case or cylinder base, I know you did'nt.right? Also, when you put nice new and perfectly round rings into an old engine, they like to be in perfectly round cylinders, or very close. Warranty: Guaranteed 10,000,000 cycles to keep the original precision, and 100 precisely calibrated before shipping. small engines, marine applications, and snowmobile. So eh, what was the original reason for replacing the rings? A couple of things to remember, if the "new" base gasket is a lot thicker than the old one, then yes, compression would be lower. Buy Compression Tester - 8PCS Small Engine Cylinder Pressure Gauge Tool Automotive with Brass Adapters and Rigid. I found that kind of odd, because I don't quite see how the tops of the pistons are supposed to sit tight in the heads with 2 gaskets in there. Could there be a low compression reading due to different gasket thicknesses? Also, when I pulled the heads off, there were 2 aluminum gaskets per side. A proper compression test is a great way to check the overall health of your snowmobiles engine. compression was 80 each side, then went up to 90 when I put some 2 stroke oil down the heads.Īlso, because the base gasket ripped when taking the jugs off, I built a new gasket out of gasket paper (or whatever it's called). Pulled a snowmobile trailer with two snowmobiles a few times, and drove mostly a highway commute about 15 miles each way to work. What could I have done wrong? I did run the engine for about 10 seconds, but that was it because the neighbors are sleeping. What did I do wrong? Does the sled have to run for a while in order for the rings to seat themselves? I took a bottle brush to the jugs, I re-used the old head gaskets but I don't think there's a problem there, because the needle doesn't drop on the compression tester. OMT Compression Tester, 8PCS Engine Cylinder Pressure Gauge for Petrol Gas Engine, 0-300PSI Engine Compression Tester Automotive with Adapters for Cars Trucks Motorcycles Marines ATV UTV. So I put the new rings in it and now compression is 80 each side.
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