Hey all, I've done lots of work with engines for the last 25 years, but somehow I've been able to avoid power valves... until now.
I've got an 03 Viper Mountain I picked up last year and rode twice. A week or so ago I decided to pul the engine for a variety of service work and cleaning. When I got it, it came with SLP triple pipes. I plan on putting stock exhaust back on it. The triple pipes had melted some of the plastic coating off the outside of all 3 power valve cables and I can see the metal wound part of the cable, but they still operate freely. Last night I pulled out one of the valves only to find it very gummed up. I have attached some pics. Yes, I made an amature mistake by taking a wire wheel in a drill to clean the power valve, and I know I stripped off some of the coating. My bad, lesson learned. But my bigger question is the lip of the valve closest to the piston appears to be curled over or mashed in a few spots. Looking through the exhausr port, my piston is clean and undamaged, but I don't know the past history of this sled. What could cause this curling over of the edges. I haven't pulled the other two yet, but if they are in similar condition, are these valves salvagable, or should I order new valves and cables?
I know YAMMAHEAD was repairing valves up till last year, but I haven't seen any recent posts. Is there anyone else who does a refurbish/exchange service on power valves?
I've got an 03 Viper Mountain I picked up last year and rode twice. A week or so ago I decided to pul the engine for a variety of service work and cleaning. When I got it, it came with SLP triple pipes. I plan on putting stock exhaust back on it. The triple pipes had melted some of the plastic coating off the outside of all 3 power valve cables and I can see the metal wound part of the cable, but they still operate freely. Last night I pulled out one of the valves only to find it very gummed up. I have attached some pics. Yes, I made an amature mistake by taking a wire wheel in a drill to clean the power valve, and I know I stripped off some of the coating. My bad, lesson learned. But my bigger question is the lip of the valve closest to the piston appears to be curled over or mashed in a few spots. Looking through the exhausr port, my piston is clean and undamaged, but I don't know the past history of this sled. What could cause this curling over of the edges. I haven't pulled the other two yet, but if they are in similar condition, are these valves salvagable, or should I order new valves and cables?
I know YAMMAHEAD was repairing valves up till last year, but I haven't seen any recent posts. Is there anyone else who does a refurbish/exchange service on power valves?
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bluemonster1
LIFE MEMBER ONLY ONCE!!!
don't know why,but some of my valves also had that curl effect ,I filed my down to follow the contour again carefully.
super1c
Super Moderator
I know rich has been back on this fall. He has valves listed in his want add done and ready to ship if you dont want to reuse yours. As far as i know the coating only helped to "keep them clean" which we all know really dosent work all that well. I would think you would just have to clean them more often. I would clean the edges up like blue said and run them keeping a close eye on them. If cleaned regularly they are not that much work.
you can run them but with the coating gone, they will build up faster. The bend over corners come from valves that have been adjusted out too far. When the valve goes all the way out, it will hit on a small part of the jug. This keeps it from dropping into the motor. if you have valves where this is beat off too much and the cable brakes or is adjusted wrong, the valve can jamb on the piston. Usually when this happens, it is not while it's running, it is when you shut it off, next time you go to start it, it jambs.
so, just make sure there isn't too much of this material missing so that if you slide the valve into the head, you can still move the piston by it.
if your valves are bad, i do have some used ones.
you should clean them with a new razor blade, carb cleaner and a tooth brush, next time for sure
so, just make sure there isn't too much of this material missing so that if you slide the valve into the head, you can still move the piston by it.
if your valves are bad, i do have some used ones.
you should clean them with a new razor blade, carb cleaner and a tooth brush, next time for sure
i am still here and repairing valves still ....as stated you valves were a little out of adjustment so they were probally slapping the piston which caused the edge to get bent over a little .......but either way i can fix your valves for you il pm you .....