DT125R ARCHIVE

PatMan · Guru

Throttle Sticking

tripr · Guru

yeah mines doin the same m8 i gotta funny feeling its got something to do with the pick up coil on mines worth a look m8

PatMan · Guru

So you dont think its nothing to do with the throttle cable at all, cos I noticed once or twice and its only happened a few times when you have the bike running stationary and you pull the handlebars to the left or the right the revs will go up to maybe 5k on there own aswell? I just got a new cable (pull) as they call it, so gonna fit it, what else do you think I should do while I got everything off??

tripr · Guru

could be m8 with you getting it when the bars are turned my old bike did this when i locked the bars to the right an it was just sticking under the tank where id nipped it a bit.
but this dt iv pulled it all that apart checked it an the cables free an good carbs slider drop an raises smoothly
the bikes revs only seem to stabalize a bit if i give the pick ups wires a tug an a wiggle so thats whats led me to that conclusion

PatMan · Guru

To be honest mine sounds the same problem as yours, so just to make me less confused haha, what do you think I should change or replace please :)

bkray · DTR Senior Member

Patman, yours does sound just like a dodgy throttle cable if im honest.

tripr · Guru

ava check for a fuel or 2t blockage ( airlock) iv done no luck

tried a new spark plug yet iv done no luck

new pick up coils are pretty cheap anway m8 id try lookin in to changing that

its only a tiny block with 2 little screws at the top right of the flywheel
its definetly worth taking a look at sometimes you can repair them yaself too .

untill iv sorted mine out myself m8 in in the same boat as you ( My Dts gone crazy sum1 get it a straightjacket )

PatMan · Guru

BK mate I will stick the new one on asap I am hoping thats is.........

TRIPR mate thanks for the help you been great, I need to learn more about these DT's cos being honest I wasnt even sure what pick up coils were, but now you told me so thankyou, I wonder when I take the left hand side casing off off and look at the flywheel, there will be something there to tell me oh this isnt right, cos like yourself it bloody annoyed me when this happend

plebpl · Guru

this happened to me just after i had my card out, i retook it out and cleaned everything and made sure everything was air tight. worked for me worth a try maybe?

DT-R_bradders · Guru

i cant see it being a throttle cable problem as hes sayin : my bike is running stationary, just sitting there then suddenly NOT using the THROTTLE the bike will Rev to about 10k on its own. , also i really cant see it being an electrical prob either , the only way for the engine to rev up if theres more feul and air goin in, imo i would give the carb a good clean and check the needle jet is still within spec, could be getting worn and letting in a bit more feul every now and then? check every thing in there both jets , needle folat ect, also remove the 2 little panels above the float i found on mine bits of ****e get in there too

also check you got no air leaks, use a smareing of rubber grease around the spigots wen u put it back together, also make sure theres no cracks or anything to the boost bottle thing on the intake rubber

-- Edited by DT-R_bradders on Wednesday 18th of May 2011 03:40:31 PM

PatMan · Guru

Hello Mate I have emailed tripr with what I think the problem is on mine, its the spring bit at the end of the cable what goes into the top of the carb which is sticking, evening though you put the revs back down it sticks so in other words its still fully open

DT-R_bradders · Guru

does the throttle tube still twist back on its own tho? if it does then the spring is doing its job, unless the slider is getting stuck in the runners? but then i would of thought the cable/throttle tube wouldnt return if it was,

anyway i thought u said that without touching the throttle it revs up on its own??lol

tripr · Guru

hi m8 naa moving the throttle handle peice didnt work for me either have you tried riding it like this bloody dangerous it is.
Mine runs nice if your powervalving constantly anything less an its a ****
gotta be electrical i think but cant check out my other stator cos iv done the flywheels up so tight they aint movin got a flywheel puller to but its for a pushbike an way too small
anyone know how to pull a clutch basket off without the holdin tool to would be helpfull.
it'll probably safer if i just whack my other engine back on on an ride with no clutch an just a 1st an 2nd gear lol

PatMan · Guru

Hmmmmmmmmm thanks for the info Bradders mate got the carb off at the mo so will give it a good check I did check abit the other day inside the carb and it all seemed fine, but will check again, but I must say, having put the new throttle cable on (pull as they call it) and just slightly moving my right hand side handlebar grip out about 2mm, as it was on really tight, the throttle is springing back and forth perfect now where as before it wasnt

tripr · Guru

did ya get the crazy revving sorted then m8 was it just your cable sorry forgot to ask iv been stressin today

PatMan · Guru

I dont know yet mate as just posted another topic in this sction about the racing reed valve with pics to see if I have the standard or racing ones so once I know it will all be going back together.

tripr · Guru

cheers yeah i have them plastic ones to m8 but i couldnt tell ya which is which nearly 32 myself m8 an good with pc's still learning my dt's
id take a look on ebay though at racing reeds an itll give you a picture off them to view

PatMan · Guru

I have already ordered them mate seems we both have the standard ones which really has gone on my nerves cos a garage told me not so long ago I did have racing reeds in, but not to worry they should be here by saturday

the one thing I wanna learn to do with computers well the software is photoshop

PatMan · Guru

Hello gang YAMAHA have got my bike still and even there scratching there heads about my bike over revving when stationary butttttttttttt they did ring me today and say obviously there's an air leak somewhere which we all know anyway but when they said to me it could be the crank seals need replacing I did wonder, would any of you lot agree with this? It's a big job to do and I don't want them doing this if this isn't the problem, I have always thought the problem would be in the carb or airbox somewhere around there so anyone know please why this would mention the crank seals? If it was the crank seals fair enough it has to be sorted but if it isn't then it's a waste of money replacing something which doesn't need doing? What you reckon gang????

the only way is YAMAHA DTR · Guru

manifold and after air leak, if it revs to the max. or if it revs halfway thats got an air leak before the carb

-- Edited by the only way is YAMAHA DTR on Thursday 16th of June 2011 08:28:29 PM

PatMan · Guru

Revs to about 8k mate stationary so what do you reckon before the carb or after

GADGET · Guru

a nice easy test is to get some wd40...start the bike..slowly spray a little wd40 round all the carb joints and airbox/yeis bottle joints and the reed joints untill the revs rise then you have found the leak

if it doesnt rev take off generator cover start bike and CARFULLY spray wd40 in there behind flywheel ...if it revs you have a leaky left hand crank seal

hope this helps

-- Edited by GADGET on Thursday 16th of June 2011 09:05:33 PM

PatMan · Guru

But it does rev to 8k straight away mate when you turn the bike on, but it's good you said about the crank seal so that could be the prob? As YAMAHA did say that aswell

GADGET · Guru

ahhh ok

it revs strait away

first does the throttle grip return to where it should ????

let us know

GADGET · Guru

just had a thought

my mates dt did this

it was the splitter in the cable

the cable going into it was stuck outside of the hole it should have been in and it reved its tits off... just have a look under the tank or ask the garage to have a look at the splitter

PatMan · Guru

Yes mate this has been checked but will ask them again as I put a new throttle cable (apull) on thus did cross my mind but I am thinking If the crank seals can make it do this then this has to be the problem I just never thought the seals would but it's a new learning curve for me but then it only started doing it after I had the rebore but then I never touched the carb or air box or anything else when I did the rebore just put head etc on with genuine gaskets and piston in all how it's suppose to go from manual was a straight forward job

GADGET · Guru

do you have the bike or the garage ??

dont go paying for big work until your sure

my mates bike was fine until he put his tank back on

the cable was pushed by the tank and streched it out of its hole

the seals should be the last resort as this is gonna cost you bigtime

PatMan · Guru

When I put the tank back on mate I made sure the cables were in etc so it can't be the cables as YAMAHA have all ready told me they started the big up it's ok for a minute then the revs go crazy, so it's deffo not the cable mate and if it costs me big Time mate I really haven't a choice mate do I

PatMan · Guru

Right lads just spoke to Yamaha they think they found the problem, as at the moment (touch BIG wood) the bikes running fine when they start it, it appears there was an air leak above the inlet stub, not sure if you lot have it on your bike, but above the inlet stub (which sits on top of the reed block) there is a big like trangle shape rubber thing (hope you lot know what I mean here) anyway it sounds like the person who had it before me wanted more something out the bike, and cut a hole or something inside it which now has a hole in the side of it, which of course, is coursing the air leak and making the bike sit at 8k revs idle..........Does anyone understand this please? also throttle cable needs sorting out too as yamaha said (which I am glad they noticed) when you move the handles bars left to right, the revs built up there aswell, so at the moment I am alittle more happy

what you lads think on this, your advice above has been fantastic so far, and as always thankyou so much