bakeLit
XS400 Enthusiast
Ok, here we go, guys.
I've recently bought a slightly neglected '81 XS 400 SE with 50 thousands kms on it. I've done just about everything I could to make it run.
1) I've cleaned the carbs several times, checked the diaphragms, float levels (I've got plastic floats, couldn't find any definite information on it) and bench synced them. In went new spark plugs.
2) I've cleaned the points, gapped them at 0,35 mm, set the timing using the strobe, spot-on.
3) I've replaced cracked boots with gaskets, shouldn't have any leaks.
4) Adjusted the valves
5) Tank is clean, replaced fuel lines and added fuel filter.
Now the bike starts perfectly with full choke but for what it's worth I can't get the right cylinder to fire on idle. The right exhaust is popping. Whenever I twist the throttle, the cylinder picks up and works perfectly. It rides very smoothly. But it just won't idle.
I've gone through the carbs three times, making sure the pilot jet and its circuit is free, I've set the mixture to 2,5 turns out, it must be getting fuel. I also tried spraying carb cleaner all over the carb to see if there's a vacuum leak, but to no avail.
I honestly don't know what to do. I've tried swapping the caps, even the coils themselves. The points don't emit sparks, so I suppose the condenser is fine. The battery is new. I'm just lost. I've fixed about a dozen of these XSs since 2014, split countless of these engines, and never did it cause me this much trouble.
If anyone could step in with something, I'd be glad... Thanks!
I've recently bought a slightly neglected '81 XS 400 SE with 50 thousands kms on it. I've done just about everything I could to make it run.
1) I've cleaned the carbs several times, checked the diaphragms, float levels (I've got plastic floats, couldn't find any definite information on it) and bench synced them. In went new spark plugs.
2) I've cleaned the points, gapped them at 0,35 mm, set the timing using the strobe, spot-on.
3) I've replaced cracked boots with gaskets, shouldn't have any leaks.
4) Adjusted the valves
5) Tank is clean, replaced fuel lines and added fuel filter.
Now the bike starts perfectly with full choke but for what it's worth I can't get the right cylinder to fire on idle. The right exhaust is popping. Whenever I twist the throttle, the cylinder picks up and works perfectly. It rides very smoothly. But it just won't idle.
I've gone through the carbs three times, making sure the pilot jet and its circuit is free, I've set the mixture to 2,5 turns out, it must be getting fuel. I also tried spraying carb cleaner all over the carb to see if there's a vacuum leak, but to no avail.
I honestly don't know what to do. I've tried swapping the caps, even the coils themselves. The points don't emit sparks, so I suppose the condenser is fine. The battery is new. I'm just lost. I've fixed about a dozen of these XSs since 2014, split countless of these engines, and never did it cause me this much trouble.
If anyone could step in with something, I'd be glad... Thanks!