Right so I’m back on here to bounce of the experts again. So I’m running bigger mufflers and unifilters. Pipes are welded and sealed correctly. I’ve synced carbs, timed the bike, checked valve clearances etc. I’m now at a point where my jetting is nearly right. I’m running standard bs38s. My main jet is 160, biggest you can get. I’m also running a richer needle, and in the lowest clip position and I have only just eliminated the flat spot that I had off idle. However, if I flick the choke on and hit the throttle, it runs even better. Where do I go now, I’ve got the richest needle at the richest position and the richest main. I have a 35 pilot set at 2 3/4 out which is richer than it needs to be. I set the air fuel mixture using the dead cylinder method and got 1 3/4 turns out with the 35 pilot.
Do I go a richer pilot to eliminate flat spotting, running lean off the bottom of the throttle? The bike already has trouble idling, probably because it is so rich. However if I wind the idle adjustment screw in a bit, the idle hangs a bit, which indicates to me that it is lean? Also on deceleration, I get very very minor popping and backfire, but when I flick the choke on in decel, this is eliminated.
Bike is still good and rideable and runs pretty well up in the revs, just the fine tuning I can’t get a grip on!! Cheers blokes.