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s3pro |
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s3pro L Plate Warrior
Joined: 31 Jul 2008 Karma :
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Posted: 11:56 - 31 Jul 2008 Post subject: Yamaha DT125R Powervalve Problems... Please advise.... |
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Hi all on here.. I'm wondering if anyone can help me with this problem.. 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. The only restriction I can possibly think of that I havnt covered is the CDI unit. I looked at that and found it was coverered in grime. As I wiped it off I realised the number on the side of the cdi unit came off with the grime, so I dont know if this is a replacement CDI or original. I even bought some new servo cables but it still wont open fully. I have been to this site https://www.dtr125.net still have the same problem. Can anyone possibly point me in the right direction? Any help would be great.. Thanx
Richard |
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Old Thread Alert!
There is a gap of 235 days between these two posts... |
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mad cookie |
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mad cookie Derestricted Danger
Joined: 11 Mar 2009 Karma :
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mad cookie |
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mad cookie Derestricted Danger
Joined: 11 Mar 2009 Karma :
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Billing |
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Billing World Chat Champion
Joined: 12 Mar 2009 Karma :
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Posted: 10:17 - 24 Mar 2009 Post subject: |
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take the exhauste off, get a small torch. turn the ignition on but don't star the bike. the pv servo should make a buzzing or whirring noise. Then IF I remember rightly when you twist the throttle at the handle bar the pv should move, turn the throttle to the end stop then shine your torch up the exhaust port and have a look if its fully opened ____________________ '84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it! |
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ben350 |
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ben350 Trackday Trickster
Joined: 29 Apr 2008 Karma :
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Posted: 13:13 - 24 Mar 2009 Post subject: |
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Partially true, but the power valve bobbin will turn by itself not by turning the throttle.
Make sure your battery is in good condition / fully charged as sometimes this causes power valve problems.
With the little PV cover off on the left side of the engine you will be able to see if its all set up correctly as the PV pulley (where x2 cables attach) has a wee tab comming off it which should line up with an approx 5mm hole in the cylinder side behind it ____________________ Ducati 996 Biposto
Suzuki Goose 350
DT125R Supermoto (Project) |
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eazy rider |
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eazy rider Derestricted Danger
Joined: 26 May 2009 Karma :
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prawny1 |
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prawny1 World Chat Champion
Joined: 28 Jun 2005 Karma :
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stirlinggaz |
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stirlinggaz World Chat Champion
Joined: 22 Jul 2007 Karma :
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Posted: 23:08 - 04 Jun 2009 Post subject: |
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hi,
only ever set up the ypvs on a dt once.
& i followed the instructions here : https://www.dtr125.net/tuningf.htm
including the bit on the standard exhaust (not applicable if you have a dep or big one FULL exhaust system)
easy to follow pics & it worked for me!
also has instructions on the electrical restriction on the later models (the grey box)
cheers,
GAZ |
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Old Thread Alert!
The last post was made 14 years, 328 days ago. Instead of replying here, would creating a new thread be more useful? |
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