Throttle stumble just after idle

jpdevol

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So, that indicates a bad regulator/rectifier unit. You can do a plug-n-play from Mike's for XSCharge, perhaps a conversion from generic (I have not done, but a search may yield answer) or a MOSFET unit from Hugh's. I'd do the latter - opinion.

I'd also do the AC check before ordering, just in case there is an issue with the whole XS Charge.

https://www.mikesxs.net/yamaha-xs650-xscharge-pma-rectifier-voltage-regulator-replacement.html

https://www.hughshandbuilt.com/product/3-phase-mosfet-regulator/
 

WV Sparky

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So, that indicates a bad regulator/rectifier unit. You can do a plug-n-play from Mike's for XSCharge, perhaps a conversion from generic (I have not done, but a search may yield answer) or a MOSFET unit from Hugh's. I'd do the latter - opinion.

I'd also do the AC check before ordering, just in case there is an issue with the whole XS Charge.

https://www.mikesxs.net/yamaha-xs650-xscharge-pma-rectifier-voltage-regulator-replacement.html

https://www.hughshandbuilt.com/product/3-phase-mosfet-regulator/
Checked from yellow wire to yellow wire in every possible way, consistently 13.8 VAC
 

WV Sparky

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Alright guys. I want to thank everyone here for the help. Sure, the capacitor was the problem I was chasing it all along. But you guys helped me find out my plugs were bad, bike was out of time, carbs needed rejetting, timing chain needed adjusted and I needed a damn rectifier! Definitely couldn’t have don’t this without everyone’s help. So today I finally got to work on the XS after a week stint with covid 🫠 but new rectifier and gel 6.3 amp hour battery and the bike is happy as can be. 13.1 at idle and 14.6 at WOT. I’ll be posting a picture of the final product later today after the first real ride past my driveway 😎
 

WV Sparky

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Well folks, that’s all for now. It’s done till this winter and it’s going to make the old bike show I was aiming for that’s on the 9th! Again huge thanks guys. Everyone’s knowledge here has been invaluable and certainly helped me time and time again. Till next time guys!
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