Hi there,
I have been a regular viewer on this forum for a while but I now actually have a problem that I wonder if someone can help me with. It concerns my xt. I bought it as a basket case a number of years ago and have since built it up. I have been happy with it apart from after the first few times I tried to open it up to freeway speeds. Bottom range is great but it suddenly started sputtering when it hit about 60. I could previously wind it up to about 100 with no probs. I know that is still getting enough air as I have checked and cleaned everything and nothing else has been changed in that department.

Like a tool, the day after I noticed it spluttering, I adjusted the air fuel mix and took it for another run. This time when I gave it some gas it started really messing about and led to me pushing it for about half a mile. When I was trying to crack it up again, it blew a fuse and killed the spark. after a load of kicks it sputtered into life again and cleared itself completely (at low speeds). It then died again and I lost the spark completely. After a couple hours checking the wiring for shorts after blowing the fuse and testing the voltage going to the coil (thinking it could be CDI related) I got nowhere. After undoing, cleaning and redoing all connections in the spark circuit including the HT lead, it started showing 12v and a decent spark out of nowhere when kicking it over.

So....I can now run it at fairly low speeds and it revs freely to the red line in neutral. However if I gas it in fourth or fifth I end up with it sputtering and farting and either dying or finally clearing itself.

I have monkeyed around with the air screw but trying it in a number of positions seems to make no difference to performance. Could it be a dodgy coil cutting the spark? The CDI? a blocked jet in the secondary carb? (the only reason I haven't torn the carbs down is that after it has started messing at mid to high speed it still sputters when I slow down to low speed and also in neutral for a good while before clearing.)

It's been a bit of a bugger and after sorting the head gasket, clutch, charging system, whole electric start system as well as the cosmetic side of things, I now just want to ride the damn thing!!


Any help would be greatly appreciated!

Cheers,
Mike