olewahrhorse
XS650 Enthusiast
One Benjamin Franklin got me a 1979 XS650 and a whole lot of work! It didn't take long to get it up and running, so I set out to summons a high pipe street tracker out of it. Only 3200 original miles on the clock, the engine was tight with a lot of compression. Not so much now...The engine cases show absolutely no signs of prior owners greasy little fingers molesting the internals in any way shape or form! I cut excess weight off the machine and replaced everything with plastic. I removed the stock air filters and put a set of TC Brothers high pipes with 16" cones on it. When I got into the carbs, which you will read, did not go well. one BS 36 carb had a 2.5 fuel needle and seat. The Other had a 2.0. So I ordered carb rebuild kits, and the both came with 2.0 fuel needles and valve, which I used. I rejetted the primaries with 30 jets. (original 27.5) The high speed jet went up one size as well I believe 135. On my tuning ride the right carb had alot of gas spitting out the idle jet into the air pod. So I thought my float was set too high. I adjusted the float from 24mm to 25mm. A 10 mile ride to work seamed to cure the spitting of fuel into the air pod, and it ran strong across the range of acceleration. So, I took a chance and rode it to an inspection station. Another ten miles. I then rode 20 miles home. I got a little bit of a stumble going up a long hill. I made it all the way home. After it cooled off, I went to start it (It was a two kick machine) turning over with electric start I heard a metallic ping in the top end, and it would only fart out the intakes thru the carbs. Putting it up on TDC, I blew compressed air into the cylinders. It comes out past the intake valves. The head is already off. Both intake valves are warped. The number one so much it kissed the piston. ( hence metalic ping) Head gasket and new oem valves are already ordered. My thoughts are the 2.0 needle seats and the adjusted 25mm float height are the culprit.
This is my first carb rejet rodeo, and I've been kicked in the teeth hard! Welcoming anyone's constructive thoughts and criticism's...Also offering up a slightly used set of intake valves...
This is my first carb rejet rodeo, and I've been kicked in the teeth hard! Welcoming anyone's constructive thoughts and criticism's...Also offering up a slightly used set of intake valves...