Feb 08, 2010 · Its a two stroke engine, the power valve effectively changes the height of the exhaust port to give maximum power at different RPM’s, ie a lower port for low RPM’s and a higher port for high RPM’s, it mas an electrical servo motor to match the power valve position correctly to …
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Jan 28, 2012 · Yamaha Power Valve System. 2018 Harley Davidson Fat Boy Rinehart Slip Ons Upgrade Before & After (Plus A Helpful Tip) – Duration: 6:32. Joshua David Sings 10,440 views
Mar 14, 2016 · how do you set up a DT125R power valve ? 2003 model.big flat spot above 5000 rpm is it the power valve or something – Yamaha 2003 DT 125 R question. Search Fixya if you are turning to open up the valve for more power then you are making a mistake. power valves open the upper exhaust ports to allow the exhaust gas to exit
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Yamaha DT125R DT 125 R Power Valve Housing YPVS Came off a 1996 so should fit 89-03, but please be sure part fits your bike before you buy, no returns acccepted Used condition, check photos carefully
Oct 17, 2014 · Ride with my DT 125 X after pinning open the power valve. The bottom / mid end power has basically gone Bike in front is a DR-Z 400 S / SM Camera: GoPro Hero 3 Black.
Mar 22, 2012 · The water valve is located in the «outside rear lower of unit» where the water pipes go into the unit for water source feed, remove the plate, the valves lift up and out or twist and up, remover the 2 wires on the valve and replace the valve, repeat the removal in reverse.
Jun 04, 2009 · I have a 1996 Yamaha DT125R. When I first bought the bike it came with the powervalve pegged shut. I bought all of the kit to enable the powervalve as needed. Connected the motor and had a friend set it all up. The problem that I have is that the valve doesnt seem to open fully at high revs and wont go past 6500rpm.
YPVS-Yamaha Power Valve System. YPVS Yamaha engines, Yamaha Power Valve System: Yamaha engineers realized that by altering the height of the exhaust port they could effectively change the engine power delivery thereby having optimal power and torque across the entire rev range, so …