HELP! 79 moby

Milan Klinger /

I have a 79 moby which starts and idles it used to go 30mph, but will only get up to 15 mph presently. I have changed the petcock, put a brand new fuel line with a new fuel filter, cleaned the carb., and put brand new spark plugs. This did not fix the problem. It sputters and backfires in the muffler. Do not know what to do next. Any suggestions would be greatly appreciated.

Thanks,

Re: HELP! 79 moby

the same thing happened to a friend of mine's moby. any way it is carbon build up in the muffler. take it off and dissasemble it, his had so much in there it was a miricle it ran.

Re: HELP! 79 moby

Milan Klinger /

I cleaned the muffler, reset the points and my Moby is back to normal. It's going 30 mph again.

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