I have a 1978 Maxi that's been giving me problems for some time now.
The first problem is that the spark plug gives out on me about every 20-30 miles. I'll be riding and the engine will just quit. After I replace the spark plug, it starts right up like nothing ever happened.
The second problem just started a few days ago. It has been accelerating very slow and losing all it its power when I start to go uphill. When I give it full throttle, it bogs down and if I hold it like that for too long, the engine quits.
I'm guessing both problems stem from an issue with the carb. I cleaned it out and replaced the old gaskets with new ones. That didn't help too much. Then, I replaced the old main jet (#66) with a smaller one (#58). I thought that it might have been running too rich, but that didn't help either.
Does anyone have any suggestions on what I might try next?
I forgot to mention that I cleaned out the exhaust pipe and port as well. No luck there either. I don't know where to go from here. Please help.