Posted February 16, 201510 yr I I have a tzr 125 with electric powervalve how does it work.coz im not sure if my powervalve is moving.my servo has got 3 cables connected thanks jonny
February 16, 201510 yr Aye jonny " when you ignition is switched on it should whir [ power-v] , that's the cleaning cycle,,, how does she run , if its not working you"l have no power-band, and if its stuck open , no bottom end power ,but plenty top end,
February 17, 201510 yr Author Yep it turns wen I turn ignition on and I have a hell ov alot ov top end but not much bottom..how do I resolve it..wat makes it open then wen riding.
February 17, 201510 yr Moderator Yep it turns wen I turn ignition on and I have a hell ov alot ov top end but not much bottom..how do I resolve it..wat makes it open then wen riding. its an electric servo,opens for top end closes for lower revs. they are supposed to be stripped every year and HiMelt grease applied. then adjusted
February 17, 201510 yr Author Not too sure about uk spec its a 1993.the bike runs fine justabit slugish on bottom end hence the powervalve is open.not too sure wat I need to do for it to work properly or wat is stopping it from working correctly the servo has 3 cable and it says 4fl
February 17, 201510 yr Check that the cables are lubed and moving freely and that the powervalve is in the proper position before you adjust the cables . I'm not sure about your particular model but most Yam powervalves have a hole in the cable holder which has to be lined up with a similar hole in the metal of the powervalve casing prior to adjustment .
February 17, 201510 yr Like I said man , I'm not sure about your bike , but if it's the same set up as a YPVS350/125 there's a little slot in the cable holder/pv pulley that you line up with a little hole in the metal casing ,( You have to remove the cover on the end of the PV where the cables go in ) , and hold it there with a drill bit or a nail . Then you adjust your cables as per owners manual . Hope that helps man ,
February 17, 201510 yr Author Yeah it helps pal anything is beta than nowt ill have a look wen I finish work.shud it open wen I open the throttle coz there is 3 cables
February 17, 201510 yr No man , it should be opened by the servo (where the cables start , not the pv end ) , when the revs reach a certain point .
February 17, 201510 yr Moderator You need the exhaust off to check it properly. But a 93 bike fit and healthy with the pv will be weak off the mark. If the valve was pinned it would struggle to pull away under 4000rpm and go absolutely nuts, like wheel lifting in 4th nuts at 7k. I get the feeling your bike is normal.
February 17, 201510 yr Author My servo must be nakered then coz iv tryed the powervalve half shut and the bike was shit lol must not ov been opening but now its open it goes like train
February 17, 201510 yr Just been googling , as far as I can make out your bike has the same set up as the 350YPVS including the same servomotor so it should be easy enough to get info/parts .
February 17, 201510 yr Author Iv had the exhaust off pal.as we speak the valve is open n goes like a rocket
February 18, 201510 yr Moderator Just been googling , as far as I can make out your bike has the same set up as the 350YPVS including the same servomotor so it should be easy enough to get info/parts . Once upon a time it that was how we de restricted them. Ypvs parts and some tweaking. Missile! Thank you. To be honest most of em ( read nearly all) ended up skidding down the road.
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