hermanlifer
XS650 Enthusiast
All was going so well. About 30 miles into riding around aimlessly and making minor adjustments over the last few days I got a real problem. I’ve read and read post after post about similar problems but I figured I’d share my issue and eventually it’s solution.
Problem? Sputtering at higher RPM. I don’t have a tach. But if you open up the throttle with any gusto it will sputter and bog, in any gear. It happened out of the blue, running strong along about 45mph I decided to crank it up a little and about 50mph it sputtered. Backed off throttle and power returned. Limped home about 12 miles with a feathered throttle as it began doing this in all the gears at all speeds. If I upshift and drop rpm the sputters disappear so it seems clearly a carb issue. Did the hours of reading online, popped off the carbs and inspected. All looked clean, except a suspect diaphragm.
1983 Bs34. By the way.
Pinhole and slight tear?!! Could this be my problem? Did these old diaphragms only have 25 miles left in them? I’m going to try the plasti dip repair method tomorrow. We’ll see how that holds. In the meantime I can’t think of another reason why it would happen so abruptly like that. I understand jetting and air leaks and all but it’s been solid in the driveway and up and down my road during rebuild and testing and the short bits of road riding I’ve done since getting legal last Friday.
I inspected main and pilot jets and all looked clean, no junk or gunk this is essentially fresh build. New tank lines filter etc etc.
83xs650
Bs34 carb with stock jets
Original boots, not perfect but they passed air leak test with starter fluid.
K&n filters
Vacuum ports in carb manifold linked.
That’s all I can think of now. Long ass day.
Picture isn’t in focus but the light colored streak is the tear, but only a little pinhole of light is visible surprisingly. Both diaphragms seem to fall pretty slow too, so I’m not 100 on anything tonight. More questions than answers for sure.
Problem? Sputtering at higher RPM. I don’t have a tach. But if you open up the throttle with any gusto it will sputter and bog, in any gear. It happened out of the blue, running strong along about 45mph I decided to crank it up a little and about 50mph it sputtered. Backed off throttle and power returned. Limped home about 12 miles with a feathered throttle as it began doing this in all the gears at all speeds. If I upshift and drop rpm the sputters disappear so it seems clearly a carb issue. Did the hours of reading online, popped off the carbs and inspected. All looked clean, except a suspect diaphragm.
1983 Bs34. By the way.
Pinhole and slight tear?!! Could this be my problem? Did these old diaphragms only have 25 miles left in them? I’m going to try the plasti dip repair method tomorrow. We’ll see how that holds. In the meantime I can’t think of another reason why it would happen so abruptly like that. I understand jetting and air leaks and all but it’s been solid in the driveway and up and down my road during rebuild and testing and the short bits of road riding I’ve done since getting legal last Friday.
I inspected main and pilot jets and all looked clean, no junk or gunk this is essentially fresh build. New tank lines filter etc etc.
83xs650
Bs34 carb with stock jets
Original boots, not perfect but they passed air leak test with starter fluid.
K&n filters
Vacuum ports in carb manifold linked.
That’s all I can think of now. Long ass day.
Picture isn’t in focus but the light colored streak is the tear, but only a little pinhole of light is visible surprisingly. Both diaphragms seem to fall pretty slow too, so I’m not 100 on anything tonight. More questions than answers for sure.