I have a very strange problem where my Drifter will ride fine for the first few miles (between 6 and 20). Then it will start to sputter like it's misfiring. If I accelerate it sputters ever worse and lunges. It will do that even if I try to keep the accelerator constant. Eventually I am forced to pull over as it slows down more and more while trying to keep it going.
When I pull over and turn off the engine, it will not start back up for 2-10 minutes. When I am finally able to turn it over, there is a cloud of black smoke that comes out of the pipes for a moment. The bike will run fine for a few miles and start doing the same thing. Each time the distance I can go is shorter and shorter before it starts lunging again.
If I leave it overnight, the next day the process starts all over again where it will run fine for 6-20 miles.
I have taken it in to a mechanic, but he acts like I'm crazy and making it up because he can't reproduce the problem. He rides it for a mile or two and says it is fine. He even said he fixed it once, but he just replaced the spark plugs and tried to convince me it was just vapor lock. Of course, a few miles down the road the same thing happened.
Any help would be appreciated. I'm sure it is something simple, but I just don't know how to troubleshoot this problem.
Sounds like a fuel filter,replace filter, run some carb injecter cleaner through gas tank.("important" read label, most bottles are for 10 gallons, add accordingly)
Try the fuel filter
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