Blown engine options to fix.

[nelsonhouse]

blew my engine good. One piston and cylider down. Mag cylinder has a good gouge in it. What are my options on fixing it over the summer.

 

[Ding]

Parts and a good engine builder - should be one by you. Be sure to find the root cause or it can just happen again. With that much damage I would check the crank and bearings carefully.

 

[rx1jim]

How many miles are on the engine? Looks like the failure was caused by detonation. Root cause could be dirty jets in the carb, low octane/stale gas air/vacuum leak causing a lean condition. You can replace the one damaged piston and swap the damaged cylinder with a replated one from US Chrome or Millenium. How does the interior surface of the cylinder head look? Chances are it is damaged also and will need to be replaced. Take a look in the exhaust ports of all three cylinders to see how much carbon is on the pistons just below the pistons rings. This well tell you how bad the blowby is on the other pistons. If it were my engine, I would perform a complete rebuild: new gaskets, seal and rings. As Ding said, check or have the bearings checked on the cranshaft and be sure to get all the debris out of the crankcase. No sense in cutting corners only to have to perform the rebuild all over again. Go with OEM parts. How are your mechanical skills and tools, are you thinking of rebuiding the engine yourself? If so, the folks on this site will give you plenty of support.

Jim

 

[nelsonhouse]

Hi

I can do the rebuild myself. I Have good mechanical skills and good tools. I'll take a bunch of pics during the rebuild. I think i will start in August. You guys have a good summer.

 

[MR.HAPPY]

Good time to go Big Bore!!!