If you got lucky and it was a slightly plugged pilot sometimes you can remove the adjustment screw and clear it with carb spray, acetone, and air. Since that takes a minute a carb I'd try it first.

Hi Cookie,

Did that and it did not work. Never does with my machine. One of the guys at the club meeting last night suggested maybe just some water got into the float bowl. Remembering back the problem started after I put some gas stabilizer in the tank. Could be it was too old. I'll go through everything today.

It could easily be bad fuel. At least that is easy to test for. I just found out I can get fuel at the San Carlos Airport if I don't exactly specify what it is for and call it testing purposes.

Started take the carbs off the intake manifolds. The right carb had a broken o-ring and a missing section - between the carb and the manifold. Found the problem., yea!

Slightly loose nuts and a backfire?

Cookie wrote:Slightly loose nuts and a backfire?

Are you asking about the rider or the bike?

from norton1973, It may not be what you want to hear, I just had my whole top-end done by a shop in Nashville, with one ADDITION, a Makuni 34mm carb. I had pulled my hair out trying to get the amals perfect, not to mention getting the ticklers right and not leaking, etc. I was reluctant to go with a single carb, and it not be a amal. However, I have never been happier, no issues at all. The choke is perfect. Single lever, and 1 or 2 kicks max, and she fires right up. Idles like never before. Once you drive a Norton with one you'll nver go back. Best thing I've ever done. Very, Very smooth!

norton1973 wrote:from norton1973, It may not be what you want to hear, I just had my whole top-end done by a shop in Nashville, with one ADDITION, a Makuni 34mm carb. I had pulled my hair out trying to get the amals perfect, not to mention getting the ticklers right and not leaking, etc. I was reluctant to go with a single carb, and it not be a amal. However, I have never been happier, no issues at all. The choke is perfect. Single lever, and 1 or 2 kicks max, and she fires right up. Idles like never before. Once you drive a Norton with one you'll nver go back. Best thing I've ever done. Very, Very smooth!

Not yet ready to give in to a Mikuni. My Amals are silky smooth on the throttle with the Gaylord sleeving. After 12 years they have realitively little wear.

Cookie,

No loose nuts, but yes it was backfiring due to the leak. Took it out yesterday. Had to advance up the spark just a bit. Had the timing cover off recently to replace the timing cover seal at the cam. Now it's running very nice, ready for another season!