St0fxxx

By Silencer do you mean the end pipe or the on which comes out of the engine? is this not full of fibreglass? will it melt?

Hi Guys, My '89 DT125R has been standing for about 4 years before I got it. I have cleaned the carb fully and also cleaned the air filter. There is a bolt which wont come out on my DEP exhaust end so cant check whether the exhaust is coked up. Is it worth getting some de-coke solution to try and clean her out a bit, atm she doesn't run very well past 7k rpm and im thinking maybe she all gummed up insdie (oo-err). If they are worth trying can someone recommend a good de-coking solution to try? Is this stuff any good? :http://www.ecotek.eu/PowerBoost.htm Cheers in advance

I fitted a new H4 bulb and it is tonnes better, was easy to fit too.

Got her going in the in end, took the carb out again and the bowl was full of brown shitty petrol, this should now be resolved as i have fitted a new fuel tank. Still down on power atm and it obviously running a little hot as the temp sensor is broken. Doesn't rev above 7K still which is a little concerning but no longer cuts out which is good. After running her for a bit the plug was nice and not covered in oil (when we took the carb out we adjusted the needle). I'm not going to ride her again until i get my new temp sensor. I need a new air filter too, any recommendations?

yep thats the puppy! so the temperature sensor is disconnected...its actually the metal bit coming out of the temp sensor which has corroded and snapped rather than the wire. i dont have a case on my PV and there is definitely no servo attached. It looks like someone has put a screw in the pulley of the PV (jamming it open?) the pulley does not move at all when i turn the ignition on (but i take it this is normally controlled by the servo?). I dont know what the guy did before he sold it to me but looks like he's well and truly bodged it . Balls looks like ill need to take it to someone in the know to see if there is anything else he has "modified" more money BOO!!

i've just looked again the the wire is red and green and looks like it attaches to one of the head bolts, is this still the PV cable? And also on the power valve its self there are 2 ports numbered 1 and 2, these dont have anything plugged into them, is this right? The haynes book has something plugged into both.

Nice one, thanks a lot OG you're a star

ahh i see, would it make it splutter an run really rough? this could be (one of) the isseues

Excellent thanks OG. I have just noticed that there is a cable broken (leads into the head). I wonder whether this controls air/fuel/oil mixture?

Can i check anything to see if it does need a new crank seal? Is this something a inexperienced mechanic (me) could do?

Would you see much of a performance increase with a K&N or would it just sound better?

hmm, the very next day after i changed the spark plug the issue returned. I checked the plug again and it was coaked black again! Is it running rich or lean? im going to give it some love this weekend my plan is; Clean air filter Clean fuel filter Clean baffle Clean carb bowl If these don't resolve it, should i take a look a the fuel/air mixture screw? or could it be a worn piston ring letting oil through? Cheers

I checked the spark plug before doing the bowl and it was buggered coaked and wet. Changing to for a new one has resolved this fault. Thanks for your help OG,

cheers oldgit, if this keeps happening (the guy who had it before also cleaned the carbs for the same fault) what else could it be? Maybe the fuel filter? or is just a case of clearing all the crap out then it will stop happening? This bike was stood in the guys garage for 6 years! Eeek!

Hi Chaps i've just got my '89 DT 125 R, it was running fine but all of a sudden when riding it for the first time it totally cut out. It did not have any power at all then twisting the throttle. I stopped at the side of the road and it stalled, I kick started and it started first time, then ran fine again. I thought something could be blocked so i have cleaned the carb and the jet. I took it out for another ride and for a while it was fine totally back to normal. After about 30 minutes of riding it totally lost power at 7000 RPM, it sounds all spluttery through all gears and as it approaches the power band 7K it is awful! Now it seems to struggle to get to 40mph, very spluttery and does not go past 7000rpm. It came de-restricted witha DEP exhaust and im pretty sure he has done something power valve too. Any help would be greatly appreciated. Thanks

Found the socket type, its P45T for a DT 125

cheers mate, i just got one from a brokers fro £30 which is good, evilbay was £60 + Postage, and was rusty

Hi Guys, Does anyone know if any fuel tank will fit an '89 DT 125 R? Mine is weeping and I need to replace it but cant find one for love nor money. Thanks, St0F

Thanks a lot for the suggestions guys. Ill check them out and let peeps know how I get on with them. One other question; Is the connector type for an 89 model H4? I have the Haynes book o' lies but it doesn't say the connection type Thanks again

Hi Guys, The lights on my DT 125 R are pants! i've had a search around this site and Google and have not found a definitive answer. I have read the sticky about 125 lights being rubbish but the lights suggested in that thread dont seem to be 'made' for the bike. Does anyone have any suggestions/recommendations? Thanks in advance. st0f

Well worth a read, really funny piss taking auzy. http://27bslash6.com/

Hi Guys, Just wanted to say Hi! Im new on here and am getting a Yam DT125R (MK I) next week. Hopefully i'll be able to help others, but my knowledge is limited so for a while i'll be leaching for a while . However I do know IT very well so can scratch your back etc... I Live in the UK (Hampshire). ta St0F