Gordon in nc
XS650 Junkie
5twins.....yea, I think I found the problem.
I've already cleaned up the head and valves (should have checked the intakes before I went to the trouble of cleaning them ) and I know it's hard to believe but the seats look fine and I feel pretty sure they will lap in (as long as I don't do your air leak test )
I'm going into the parts bike's engine tonight to see if I can use it's intake valves. Shouldn't take as long this time around now that I've already done it once.
I'm not going to get to the cylinders tonight....but will report back when I do.
Hard to believe the bike ran at all. I wish I had checked compression with my gauge FIRST thing......I'm not used to working on twins. With a single....everything is so simple....no need to balance with another cylinder.
Good thing is this time, I'll know what kind of compression it has......BEFORE the engine goes back in the frame.
I can't wait to hear that beautiful exhaust note again.
Gordon in NC
Headless 1975 XS650B
and a few jealous BSA unit singles
PS, 5twins....if I think about it I'll snap a pic of that left side (?) exhaust seat tonight now that's it's cleaned up (but not lapped yet)
I've already cleaned up the head and valves (should have checked the intakes before I went to the trouble of cleaning them ) and I know it's hard to believe but the seats look fine and I feel pretty sure they will lap in (as long as I don't do your air leak test )
I'm going into the parts bike's engine tonight to see if I can use it's intake valves. Shouldn't take as long this time around now that I've already done it once.
I'm not going to get to the cylinders tonight....but will report back when I do.
Hard to believe the bike ran at all. I wish I had checked compression with my gauge FIRST thing......I'm not used to working on twins. With a single....everything is so simple....no need to balance with another cylinder.
Good thing is this time, I'll know what kind of compression it has......BEFORE the engine goes back in the frame.
I can't wait to hear that beautiful exhaust note again.
Gordon in NC
Headless 1975 XS650B
and a few jealous BSA unit singles
PS, 5twins....if I think about it I'll snap a pic of that left side (?) exhaust seat tonight now that's it's cleaned up (but not lapped yet)
Last edited: