jonnytzrroberts Posted February 16, 2015 Share Posted February 16, 2015 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 Link to comment Share on other sites More sharing options...
blackhat250 Posted February 16, 2015 Share Posted February 16, 2015 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, Link to comment Share on other sites More sharing options...
jonnytzrroberts Posted February 17, 2015 Author Share Posted February 17, 2015 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. Link to comment Share on other sites More sharing options...
Moderator drewpy Posted February 17, 2015 Moderator Share Posted February 17, 2015 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 Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 17, 2015 Moderator Share Posted February 17, 2015 Is the bike bone stock uk spec? What year is it. Link to comment Share on other sites More sharing options...
jonnytzrroberts Posted February 17, 2015 Author Share Posted February 17, 2015 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 Link to comment Share on other sites More sharing options...
KevtheRev Posted February 17, 2015 Share Posted February 17, 2015 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 . Link to comment Share on other sites More sharing options...
jonnytzrroberts Posted February 17, 2015 Author Share Posted February 17, 2015 Wat wud you say the proper position is mate Link to comment Share on other sites More sharing options...
KevtheRev Posted February 17, 2015 Share Posted February 17, 2015 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 , Link to comment Share on other sites More sharing options...
jonnytzrroberts Posted February 17, 2015 Author Share Posted February 17, 2015 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 Link to comment Share on other sites More sharing options...
KevtheRev Posted February 17, 2015 Share Posted February 17, 2015 No man , it should be opened by the servo (where the cables start , not the pv end ) , when the revs reach a certain point . Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 17, 2015 Moderator Share Posted February 17, 2015 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. Link to comment Share on other sites More sharing options...
jonnytzrroberts Posted February 17, 2015 Author Share Posted February 17, 2015 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 Link to comment Share on other sites More sharing options...
KevtheRev Posted February 17, 2015 Share Posted February 17, 2015 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 . Link to comment Share on other sites More sharing options...
jonnytzrroberts Posted February 17, 2015 Author Share Posted February 17, 2015 Iv had the exhaust off pal.as we speak the valve is open n goes like a rocket 2 Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 18, 2015 Moderator Share Posted February 18, 2015 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. 1 Link to comment Share on other sites More sharing options...
Recommended Posts