81 Yamaha XS 400 Special discussion forum:

RE: weird problem

RE: weird problem

Woody said 2006-09-25 03:41

Check the oil. Make sure it is does not look/feel thin. Also, make sure it does not have a strong gas smell.

Mine had a small petcock leak that allowed gas to overflow the carb float bowls and creep into the oil reserve.

I needed to change the oil and install a common lawn mower inline gas valve close to the gas filter. This stopped the gas from leaking into the carb.

I tried use a petcock repait kid, but did not have any luck with it.

I hope this helps and enjoy your XS400.

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