Last year I used Sea Foam to winterize the carbureted Suzuki Intruder.
An old school biker told me the technique:
Run the tank down to nearly empty. Dump a full can of Sea Foam into the tank, and run it long enough for the cleaner to get into the carbs. Turn the bike off and let it sit for 48 hours. Then, close the petcock and start the bike, burning all the gas out of the carbs.
The funny thing was, the old school bike made it sound like it was a deep dark secret. And as I was finishing up, I noticed these same instructions on the side of the can. Nothing secret about it.
Last year when I did this, the next spring when I started it up, it ran but would not take any throttle. I borrowed a little gas from the lawn mower can, and got it running. Took it on a seven mile ride. To start with it was backfiring like crazy at mid-throttle on acceleration. After several miles it calmed down quite a bit.
Another year has rolled around and I just dumped an entire can in the Suzuki tank, like before. In 48 hours I'll run the fuel out of the carbs, and in the spring, I'll provide another report.
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