Hello I'll keep it short. When I'm cruising at 50-60km/h at 4.5-7k revs, open the throttle from cruising position JUST A LITTLE BIT, the bike bogs down, a "burring" noise comes from the exhaust, and it slows down a little, lurches, and maybe in the end begins to speed up. If I open the throttle wide from this cruising/bogged down position, there is no problem it lurches into life and goes. Other info - My fuel economy is poorer than it should be (14km/l approx) I tried setting the main jet needle circlips to their leanest setting - SOLVED THE PROBLEM, but bike backfired on deceleration (too lean). So I'm thinking... perhaps... it's running over-rich on one or two cylinders at low revs? I haven't balanced my carbs yet. Could the choke circuit be stuck on one carb? The bike doesn't blow smoke... It's 20,000km old and recently had a service (about 15k). All jets are as per parts manual and carbs recently cleaned. Thanks
I would say that it is a carb problem but not sure what you would do to fix it. Mine used to do a similar thing at about 9000/1000 rpm.
