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Old 05-14-2008, 11:11 AM   #1
Archell
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Engine Problems - Any Advice?

A friend of mine has a sportster that had been sitting up for a while and wouldn’t start. Went to take a look and the plugs weren’t firing – changed them out and it started like a champ. Since it had been sitting up for a while, I flushed the fuel system / carb with solvent and let it run for about 20 minutes. I decided to take it for a spin - it ran great for about 10 minutes, but then it backfired a few times, started to lose power and eventually crapped out - wouldn't start back up. I let it sit for about 30 minutes and then it fired right back up. It was still backfiring, but after idling for a while it eventually stopped so I took it for a spin again. Same thing – ran great through the whole range of rpms (had it up to 65mph), but after about 20 minutes it started to backfire and crapped out again. This happened one more time. My first thought was the carbs b/c it had been sitting up, but when it ran it was smooth through the whole throttle range and idled great. The way that it backfired made it seem like it was something with the timing, but it would only happen after it had run for a while. Anyone have any ideas? Thanks in advance.
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Old 05-14-2008, 11:27 AM   #2
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Probably still a fuel mixture issue. Did you remove and clean the carburetors or just throw some cleaner stuff in the tank? It may have to also do with the cooling system.
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Old 05-14-2008, 04:20 PM   #3
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Drain the whole tank?

Excriment in the tank can heat up with the engine temperature below it and clog the filters... TL and three others didn't believe me until it happened to their bikes...

Does this happen after you open the choke? Or just after riding w no aggrivation?
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Old 05-14-2008, 05:35 PM   #4
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I didn't clean the tank, but I did pull the hose at the carbs and it was getting plenty of gas...Also pulled the air filter and put my hand over inlet to put plenty of juice in the carbs...Runs fine with the choke open or closed (once it has been on for a while)....Would a lack of gas make it backfire like that? Thanks again
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Old 05-14-2008, 06:15 PM   #5
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Sounds like dirty carbs and/or the diaphrams ruined from your carb cleaner.
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Old 05-17-2008, 10:01 AM   #6
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clean carbs and check out the air filter
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