1976 Suzuki GT750A Cylinder Problem
Editor’s note: If you’re having trouble with that old Suzuki, BSA or BMW, Keith Fellenstein is your guy. From motorcycle tuning tips to detailed motorcycle engine repair, he can draw from a wealth of experience to help guide you to success. Send questions to: Keith’s Garage, Motorcycle Classics, 1503 SW 42nd St., Topeka, KS 66609, or send an email with “Keith’s Garage” as the subject.
Ignition or carburetion?
Q: I have a question about my restored 1976 Suzuki GT750A. I did a complete engine overhaul on the bike, split the cases and had the crank rebuilt, including new oil seals. The CV carbs were also rebuilt. It has happened twice now during a ride that all of a sudden I lose power on one cylinder completely. It runs on only two cylinders for a bit and while I can keep the engine going on two cylinders and play with the throttle a bit all of a sudden it kicks back in and operates like nothing happened. Could this be an ignition issue or carb issue?
Jerry Gooren, Hayden, Idaho
A: Since it’s always the same cylinder, and the easiest thing to check would be ignition, I’d start like this: Rewire the coil from the constantly bad cylinder to one of the others, and swap that cylinder’s coil to the bad one. See if the problem migrates to the newly assigned cylinder. If so, you have a bad coil. If the problem remains with the original bad cylinder, then you should check that cylinder’s carburetor and mountings.
Norton Commando Q and A with Keith
This issue Keith answers Norton Commando questions on running too rich, jets and needles, and hearing more about using a TwinMax.
Electrical, 2-Strokes, Misfire and Carb Issues Q and A with Keith
1978 Triumph T140 electrical issues, reviving 2-strokes, Suzuki misfire, and more carb issues are this month’s featured questions Keith answers.
Oil-In Frame BSA Design Issues
A reader questions whether his friend’s oil-in-frame BSA will have any issues.