CanadianSteve
XS650 Enthusiast
Hey all, I recently rebuilt the top end of my (new to me) 78 XS650 SE. The following was done:
New camchain
New front and back tensioner
New Wiseco Pistons and rings (second oversize)
Machined out the jugs to fit
New Boyer Bransden Ignition setup
Cylinder head ported (intake/exhaust)
Cleaned carbs, timing set, chain tensioned, etc
Case was split and all gears cleaned and checked for wear
The bike was running well for a very short period of time, in fact it was running awesome. Super responsive, smooth, started easily, I was happy. Got about 4-5 hours riding time on it and started to hear a high pitched squeal that increased with RPM. Looks like I have crankshaft issues as per the attached video.
I'm pulling the engine again and will likely have the crank rebuilt, but I'm wondering what your thoughts/opinions are. Most of my questions will likely be answered when I tear it down, but:
1) Do you think that the crankshaft was failing and the extra compression/power caused the failure?
2) Do you think it was possibly a problem I created during reassembly?
3) Do I scrap the engine and look for a used one with decent compression and cut my losses, or keep going to try and fix the current one?
I welcome all thoughts and feedback on this one, sooooo frustrated!
New camchain
New front and back tensioner
New Wiseco Pistons and rings (second oversize)
Machined out the jugs to fit
New Boyer Bransden Ignition setup
Cylinder head ported (intake/exhaust)
Cleaned carbs, timing set, chain tensioned, etc
Case was split and all gears cleaned and checked for wear
The bike was running well for a very short period of time, in fact it was running awesome. Super responsive, smooth, started easily, I was happy. Got about 4-5 hours riding time on it and started to hear a high pitched squeal that increased with RPM. Looks like I have crankshaft issues as per the attached video.
I'm pulling the engine again and will likely have the crank rebuilt, but I'm wondering what your thoughts/opinions are. Most of my questions will likely be answered when I tear it down, but:
1) Do you think that the crankshaft was failing and the extra compression/power caused the failure?
2) Do you think it was possibly a problem I created during reassembly?
3) Do I scrap the engine and look for a used one with decent compression and cut my losses, or keep going to try and fix the current one?
I welcome all thoughts and feedback on this one, sooooo frustrated!