Another New Guy
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So I may have sorted my problem... I say may, because it makes sense but am yet to test.
On another forum I found some posts from about 8 years ago outlining someone else’s derestriction journey. Looks like he had a 2003 french import DTR, so very close to mine.
He found that the Powervalve under the pully was a diamond shape and needed turning to a derestricted state as it wasn’t flush with the exhaust port. Now I’d seen mention of a diamond shape thing somewhere and also mention of turning the powervalve but didn’t really understand what it meant. There was also a restriction in his 3MB-14160 expansion chamber just like the older models straight out of the cylinder.
I was working last night so had some time this afternoon to take a look, and found my powervalve had this diamond shape on the end, and after getting the exhaust off I could feel that it wasn’t flush in the port.
Now that I’ve aligned it all, and run it up the servo is back to normal (it was a bit sticky straight after turning so I guess things were gunked up where they shouldn’t be).
Annoyingly I can’t ride it currently as the gearbox oil cap is all chewed up and I had already dropped the oil and taken it out by the time I realised. Hopefully a replacement will be here tomorrow.
Initially though it seems much smoother and revs more freely after warming it up a bit, but won’t know for sure until I ride it. I guess with the powervalve being out of line entirely it would have been restricted right through the rev range and ‘wide open’ still restricted as much as fully closed?
Not sure if this means I’ll need to rejet... biggest worry currently so will keep an eye on the plug. Couldn’t see anything in the exhaust so hopefully be much better now.
Sorry for the long post, will get a few pics up later to hopefully make sense of it all..
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@d3cme I haven't seen a powervalve that wasn't a diamond. I always recommend taking the exhaust off and matching it against the exhaust port.
@Calum said in Another New Guy:
@d3cme I haven't seen a powervalve that wasn't a diamond. I always recommend taking the exhaust off and matching it against the exhaust port.
I saw some pictures where it was rectangle and totally filled the slot, not sure on year etc though that the pic was from.
Bikes are new to me, cars I’m fine with but I was apprehensive about taking the exhaust off. I ordered a new gasket but it didn’t seem to have one in to replace? Absolutely the best way and only took a couple of mins.
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@d3cme Share a link to the post you found dude, as someone else may benefit from it in the future!!!
@NINJA said in Another New Guy:
@d3cme Share a link to the post you found dude, as someone else may benefit from it in the future!!!
I wasn’t sure if it was against the rules but well worth a read to future people who may have similar.. im really hoping it’s all sorted anyway, looking forward to getting out on if when the oil cap turns up.
https://yamahaclub.com/forums/topic/20583-de-restricting-my-dt125r/
2002 DT125R - Black
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@NINJA said in Another New Guy:
@d3cme Share a link to the post you found dude, as someone else may benefit from it in the future!!!
I wasn’t sure if it was against the rules but well worth a read to future people who may have similar.. im really hoping it’s all sorted anyway, looking forward to getting out on if when the oil cap turns up.
https://yamahaclub.com/forums/topic/20583-de-restricting-my-dt125r/
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@d3cme Sharing info and knowledge is what this forum is all about dude. Always share stuff and if it's not allowed then the moderators will pull it PDQ!!!
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Only the older DT and TZR TDR had a diamond shaped end on the powervalve, all the later 3RM models all have a rectangle end that is an exact fit in the powervalve pully. If it is a 2003 with a diamond shaped end then it is not the original powervalve and probably not the original barrel either.
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Here is a proper 2002 powervalve on the left and early type diamond powervalve on the right, if they were all diamond shape wouldn't have a rectangle in powervalve pully. Yamaha didn't make a 2003 they are 2002 models just registered later.
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Just been out for an evening ride before the forecast says it’s cold and wet again.
It’s like a totally different bike, and everything I’d hoped from it when I got it
@d3cme Happy Dayzzz then and you've still got that shiny new Romeu pipe to add to your WOG!!!
[WideOpenGrin]
:grinning_face_with_smiling_eyes: :grinning_face_with_smiling_eyes: :grinning_face_with_smiling_eyes: :grinning_face_with_smiling_eyes: :grinning_face_with_smiling_eyes:
