Hey guys, when i dropped by the LHS to get a new starter i grabbed some silicon sealant, It sure did the job. The sk 90 has really come to life with the tower 75 muffler. I am getting 9000 with the apc 16-4 and 5% nitro. That is almost 200 rpms more than i was getting with the pitts. And finally the engine feels tunable (no more backpressure and pump problems) there is a nice streak of smoke poring out the back wich will be a perfect setting for the first couple gallons. Never have i seen smoke come out of the exhaust of this engine, never! The engine never felt or ran like thise with the pitts muffler it once had on it.

Thanks for the help
Cameron