OutdoorSteve
Active OPE Member
- Local time
- 10:28 AM
- User ID
- 4776
- Joined
- Dec 11, 2017
- Messages
- 3
- Reaction score
- 4
- Location
- Daytona Beach Florida
Hi guys! I have a question for the experts. I have a 440 that has had a few cylinder kits put on and the end result is the same, seizure. The two kits I've put on were both "Hyway Kit" the fist one was big bore and we replaced a seal when that rebuild was done. Ran 20 minutes and then seized heavy marks on top and bottom of exhaust port and intake side has wear but no grooves just vertical wear marks. Initial thought was we missing a leak. During pressure/vacuum test the only leak was around the spark plug. sealed it up and test out great. Checked the rod and crank bearing and every thing I could possibly find to measure and/or inspect. After going above and beyond to find something wrong, with no results, I installed a new "hyway kit", stock size, and used a ton of oil to assemble and took all precaution while installing. Carb is at stock settings and clean. Pressure and vacuum is still good. Fire it up run for a few minutes, smoked a lot from the absurd amount of lube I used during assembly' but ran well. shut down the saw pulled the plug to make sure thing looked good. Through the plug hole I could see a light groove on the right side of the exhaust port. I removed cylinder and the vertical marks on the cylinder in all four corners are telling me it was on its way to seizure again. Piston doesn't have and wear sign yet but I have no doubt that a few more minutes of running would have resulted in seizure.
So given that four corner seizer is general caused by a piston expanding or heating up faster than the cylinder I would assume a lean condition but with all I did to prevent this I don't see how. I have checked intake boot and pulse hose and everything else. As far as I know I looking at a perfectly good bottom end that has a hatred for top ends.
My questions I guess are, what am I missing? Have you seen this before? What should we be looking for?
So given that four corner seizer is general caused by a piston expanding or heating up faster than the cylinder I would assume a lean condition but with all I did to prevent this I don't see how. I have checked intake boot and pulse hose and everything else. As far as I know I looking at a perfectly good bottom end that has a hatred for top ends.
My questions I guess are, what am I missing? Have you seen this before? What should we be looking for?