Hi I have a 1999 Vmax Sx 700 Triple. The engine was replace by a previous owner so it has unknown miles. It is a red top 700 triple. Fist when I was having trouble with my sled I was bogging out every time I went to go full throttle. I did a compression test and it came 90 psi in each cylinder. So I went to a dealer bought new gaskets, pistons, and rings. Took the engine apart and put the new parts in. When I put the new gasket on the top, I cut the ribbit holding them together and took the middle layer out to build more compression. When I put everything back together, I did another compression test. It came out as 100 psi in each cylinder. I figured it was bad seals in the crank. So we bought a known good crank from a sled that had bad pistons. The sled that the crank came from was a 2001 sxr red top motor. I switched the cranks. Putting everything back together I noticed that the plugs from stator was different. So I took the recoil off my original crank. I've own this sled for 2 years and its the first time I've taken the recoil off. When I taken it off I noticed the fly wheel nut was missing. So I think this is the reason why my sled wasn't running right. But any way I switched the plugs from the stator. Now every things back together. I took the sled down the street and back. Now it sounds like its running on two cylinders. The cylinder furthest from the PTO side isn't firing. So I put a never been used BR9ES spark plug in. Still sounds like its running on two cylinders. So I did another compression test and i'm still reading 100 psi. Am I doing something wrong? Everything is torque to specs. I put in new gaskets for everything. Carbs have been cleaned recently.
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