May 20, 2015

YPVS Controller Repair - Service


It's been a while since I last posted anything related to YPVS boxes. So here are a couple photos of YPVS controllers, a Rz500 YPVS unit for Spencer(UK) and a Tzr250 2MA unit for Steve(UK). Both controllers were repaired and then modified.

5 comments:

  1. I have an 84 DT200, would you be able to tell me how I can diagnose the YPVS controller. I have replaced it once with a used unit as the original would cause the servo to continually cycle.

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  2. I'm not sure what you're asking but the issue you describe seems to be one of the common faults for malfunctioning YPVS controllers.

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  3. What I mean is how can I determine what is causing the YPVS controller to not work correctly and what I can do to repair it. I also read you mention being able to modify the controller, what does that accomplish? Does it change the amount the valve is open at a specific rpm?

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  4. Sorry Anonymous but I cannot help a lot on YPVS repairs, I have to keep some things to myself. Regarding the modification, it alters the whole exhaust valve curve e.g starting - opening rpms, duration & movement. There are lots of stuff for this modification in my blog.

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  5. Completely understandable, as an aside could you tell my why there is a second cone inside the expansion chamber on the DT200, the cone in my exhaust had come loose (rusted off) and I opted to weld it to the end of the expansion chamber inside with the cone facing the exhaust port.

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