DT125R FORUM

Nice bikes

Thanks Calum. I took it out again this afternoon with more fuel in the tank. It happened again but then I remembered reading that I shouldn't be afraid to rev it hard at the top end. When keeping the revs high (8k+) it seems to run fine. Such good fun now, I can really appreciate what all the fuss is about these bikes. And that's coming from a guy who has a 959 Ducati! (Without wishing to sound like a t*oser)

Hi. Just removed the restrictor in the exhaust manifold it is like another bike. Don't think I'll need a 250 at this rate! Absolutely awesome. However, now I have a new challenge. Fuelling! Felt like I was running out of fuel at the top of 5th and 6th gear. Not much in the fuel tank but enough if think. Need to double check. Now thinking I may need a larger main jet in the carb? Will search around in the forum. Sure to be something here.

Just read the article about the potential exhaust restriction on the older model. Will wip it off later today and take a look. Either of you guys have an opinion as to weather a heavily gunked up power valve would make much difference to performance, bearing in mind that mine is fixed fully open? Cheers

Funny you should say that. Getting a crm250 next (hopefully not a dirty word on this forum ;-). Like I said at the start, if it's already performing to its spec, then I'm happy to leave it as it is. Cheers

Great, thanks. Will take a look.

Thanks guys. Nice to meet you. If anyone can give me a clue as to where the restrictor might be that would be great. Just to be clear, this is a 1989 model so suspect that there wont be any electronic restrictor of any kind fitted. Plan to take the head off to clean the power valve soon, as although it rotates freely, I wasn't able to get the 2 halves out previously. Think it's just stuck in there with carbon. Cheers

Hi. I am a proud owner of 1989 dtr125. As standard this model has no power valve servo. I have fixed the valve fully open, which makes it great fun at the top end of the gears. Question. What top speed would you expect a 14 stone guy to get out of it? I get 55mph max. Just wondering if this model has any other restrictors fitted. If not, then I'm happy to leave it as it is. Cheers