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DTR YPVS Problems

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Boxing
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Joined: 13 Mar 2012
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PostPosted: 00:02 - 01 Jan 2015    Post subject: DTR YPVS Problems Reply with quote
Hi all. I have a '97 DTR. I've set the PV up according to the Haynes Manual. The drill bit in the little hole then tightening the securing nuts etc.

Anyway, it'll line up with the hole during the little cleaning cycle it does, but when it's running it's a little out of the hole, which is affecting the performance dramatically. (Whilst revving it, even on the limiter it's out from the hole)

I'm hearing it could be all different things.

Here is the exhaust port with it doing its cleaning cycle.

https://www.youtube.com/watch?v=wQE_g69-VsQ

Thanks for reading. Thumbs Up

Edit: I just wanted to clarify, the topend is fine. The engine is fine. With the PV pinned it'd happily do 60 MPH with ease. The problem is the bottom end it's boggy due to it being pinned, so I want to run it on the servo.
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andys675
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Joined: 08 Feb 2007
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PostPosted: 00:39 - 01 Jan 2015    Post subject: Reply with quote
does the pulley come back to the check mark when its running? a low battery could cause the PV to not fully return, as could seized PV cables, a seized or partially seized PV, cables not adjust correctly or a fubar'd PV servo or dirty connectors, or a bad engine earth
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Boxing
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Joined: 13 Mar 2012
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PostPosted: 12:31 - 01 Jan 2015    Post subject: Reply with quote
andys675 wrote:
does the pulley come back to the check mark when its running? a low battery could cause the PV to not fully return, as could seized PV cables, a seized or partially seized PV, cables not adjust correctly or a fubar'd PV servo or dirty connectors, or a bad engine earth


It's doing the cleaning cycle fine and lining up with the hole. But when the engine is started and revving, it never makes it to the little opening hole.

Quornholio wrote:
If it's a 125, shouldn't it be doing more than 60mph with a working PV?


A lot of 17 year old's lie about the top speed. Personally I've never seen a DT do 100MPH like most claim. Mine does a maximum of 70 odd MPH ragging the hell out of it. It's a low power 125CC. I've ridden KX 80 and 85's that'll probably have it all through the gears up until the max speed. MX 125's a DT wouldn't even touch.

Last edited by Boxing on 14:19 - 01 Jan 2015; edited 1 time in total
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Irn-Bru
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Joined: 13 Aug 2009
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PostPosted: 12:48 - 01 Jan 2015    Post subject: Reply with quote
My 2007 DTR did 85, mad little thing, stock apart from grounding out a wire behind the headlight which I think prevents the PV from opening up all the way or something like that. Before I did that the bike was very underwhelming, it refused to go over about 60mph. Destroyer of all 4 stroke 125's Thumbs Up
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Old Thread Alert!

The last post was made 11 years, 278 days ago. Instead of replying here, would creating a new thread be more useful?
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