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Hi-Guys I have an 78 XS650 street tracker, for the past 40+ yrs. I have always used Castrol GTX 20W50 in all my bikes, with no problems. WELL the 20W50 I'am having problems finding that weight. I found Valvoline motorcycle oil in 20W50. Is anybody using this oil ? What would you suggest...

Has anybody installed the Heiden Tuning oil cooler kit from Mikes's XS ? It looks like a good design and install's with no modifications, I also like the idea of the Honda paper filter. These 650's run hot, I don't want to install a conventional oil cooler, clutters up the look of the bike, the...

I have a 79 sreet tracker, engine rebuilt, .020 over, pod filters, mac 2 into 1. When the bike is good and heated up, cruising at 60 mph plus, I hear what sounds like spark knock, if I let off the gas a little it stops, accerate a little it gets worse. The carbs are re-jetted, pilot 30 - one...

I need a shift shaft chain guide for a 78 XS-650 SE. Part slides over shifter shaft and guides the chain coming off the engine sprocket. Yamaha part # 447-17467-02-00

The oil passage where the sump filter attaches to the base plate, should there be some kind of gasket there. Yamaha and Mikes XS don't show anything. JIM

I'am new to this forum, last week I bought a 1978 XS-650 SE steet tracker. In the process of checking it over I noticed the top dbl. breather had two hoses going down past the swing arm, they are both wide open , no filters. My question is should I run filters or the brake booster check valve ...