1980 Yamaha XS850 SG Heat Problem

Reader Contribution by Keith Fellenstein
Published on August 10, 2016
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A heat-related problem

Q: My 1980 Yamaha XS850 SG runs well until it warms up, but then it starts to miss, uses more fuel, and eventually stops running. Once it cools down it will do the same again. Back in 1980, I had one of these that did the same thing, and an adviser told me that the wiring harness had some added feature to suppress radio “noise” to improve radio reception. I think that he replaced the harness and everything was OK. Is this memory possibly correct or am I losing it?! Robert O’Regan/via email

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