DT125R ARCHIVE

mr karnage · Guru

no joy still wont run right

NORFE · DTR Trusted Engine Builder

so got it all back together and runs the same

no choke no run

thinking its my rh side crank seal now as i put a std one in single lip, when its a double special one by the look of it lol

so gonna change that see how it goes, that would explain the oily plug and every thing else coverd in the engine, not smoking bad tho thats what made me think seal was ok

gonna change it ina bit disbelief

mr karnage · Guru

this is whats happening with mine and now im stripping the engine down but when i drained the trans oil i give it a sniff and it did smell alot like 2 stroke

NORFE · DTR Trusted Engine Builder

never had one leak on rh side b4, always bathed in oil so keeps em supple, never looked at the oem seal when i pulled it out so just re-fitted a normal one, checked every thing else it could be re sealed every thing so only thing it can be is that plus tranny oil was low when drained it and all piston and crank n bore was oily as fook

will start but not easy and not with out choke, thewn boggy as hell with plug wet fru.....is that how urs has been mate

mr karnage · Guru

when i bought my bike i drained trans oil then left it for about a week and half so mine must have dried out and it hadnt been turned over in a about a month.

theres a little bath of oil right at the bottom of crank, when i turn it over i can see all the oil dripping off it, smells like 2 stroke and petrol though.

at first mine started second kick when the seal went and its got slowly worse, now it starts forth or fifth kick, wont run without choke and it revs to 4k on choke, its started to sit there a while when i turn choke off and it just dies.

plugs been wet everytime i took it out, ive changed the left hand seal and tightened eveything from the airbox to the head.

NORFE · DTR Trusted Engine Builder

yeah exactly same running wise i think we have twins then lol both same,

iv ordered one that turned up today but it dont look like the oem one the oem 1 looks to have springs on both sides, altho this new one i have is double lipped its only got spring on inside

so may pull one out other bottom end iv got to try not take long to change, there £25 from yamy furious so try b4 i buy ha

i got this one cum 2day http://www.ebay.co.uk/itm/190491549859?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_1226wt_1037

mr karnage · Guru

yh man they are alot, im gonna go with fowlers and see if they can sort it out a bit cheaper

you could test it with some petrol, put quite a bit on the seal and see if any soaks through.

i know this is how you test if valves are leaking

im gonna get a 4dl cylinder for mine and a wossner piston to go. ive just a prox conrod for it because my big end bearing and small ends are shot. its got a tzr 2rh conrod in there right now lol, the **** one that cant handle any power form what ive been told

NORFE · DTR Trusted Engine Builder

a wunt bother taking it to any garage to do it mate its not a big job just simple undoing and taking a few bits off then put seal in then put back together soon as clutch is off u can get to it

no point paying some one to do sumets u cud do ur self matey

mr karnage · Guru

yh man im doing it all myself except for fitting the conrod to the crank and reboring

ive got clutch off and taken cylinder off, just having trouble getting the bolt on the right side crank off.

i broke the pieces off wood i used to lock the crank.

think its been locktighted so gonna use a bit heat on it first

NORFE · DTR Trusted Engine Builder

just put a screw driver btween the gears on the crank and the balancer gear teeth it locks it solid thenu can undo what ever that way

abit of heat wont hurt tho mate

i cant remember if its opposite thread tho so have a look at the threads showing so ur not trying to tighten it been there done that many moons ago ha ha

smile

mr karnage · Guru

there is no threads showing lol

ill try it the other way anyway

NORFE · DTR Trusted Engine Builder

iv got about 5 threads showing after me nut finishes must be a thicker nut on urn

fused420 · DTR Senior Member

Get an impact gun in it mate, it will whip it off in seconds.

mr karnage · Guru

thats what i was thinking but i dont have access to one

do you know if its an opposite thread?

DT-R_bradders · Guru

which nut u talkin about? if its the flywheel one im pretty certain its a normal thread

mr karnage · Guru

DT-R_bradders wrote:
which nut u talkin about? if its the flywheel one im pretty certain its a normal thread

otherside

DT-R_bradders · Guru

ah rite, not sure off top me head soz lol

mr karnage · Guru

lol its orite

did you manage to check if you had that right hand crank case

Darren · DTR Respected Member

its a normal thread mate.

also ive have the same problem before with it only running on choke, plug wet with oil etc

mine turned out to be a worn bush that sits over right side cranckshaft and sits in the crank seal.

ran fine after that.

mr karnage · Guru

cheers

i didnt know whether to change that bush or not but i might aswell now

NORFE · DTR Trusted Engine Builder

yeah that bush is reversable, was same on my old cr 125

the seals wear 2 lines in it, so spin it round to get a nice new snug fit

im off in garage ina mo so ill keep u posted

DT-R_bradders · Guru

mr karnage wrote:
lol its orite

did you manage to check if you had that right hand crank case

oh yes m8y i have 3 lol one of them is a matching set with polished inlet crank chamber or i have 2 on there own, wen u say right hand u mean the side with out the engine numbers on it yea?

mr karnage · Guru

i meant to say left hand lol one with engine numbers

sorry man

DT-R_bradders · Guru

ok np lol iv only got one but id rather sell as a pair coz iv polished the crank chamber..

mr karnage · Guru

how much do you want for them?

oh yh and does the polished crank chamber make any difference?

NORFE · DTR Trusted Engine Builder

right just got locked up hopefully when its day light i can fire it up, just had a good few hours sorting everything(hopefully)

removed the "new seal" i put in on rebuild the wrong one and fitted an oem one i had in another bottom end, got some other new seals and put there springs on it, and used the best bushing ,it was a nice snug fit 2, so hopefully that will be the end of the problems

i hope

smile

DT-R_bradders · Guru

mr karnage wrote:
how much do you want for them?

oh yh and does the polished crank chamber make any difference?

not sure m8 really ill av a think about u can make an offer n tht, and yea polished cases are sposed make it a bit more responsive and free flowing for the air and feul to be transfered up top

NEV · Guru

NORFE wrote:
right just got locked up hopefully when its day light i can fire it up, just had a good few hours sorting everything(hopefully)
removed the "new seal" i put in on rebuild the wrong one and fitted an oem one i had in another bottom end, got some other new seals and put there springs on it, and used the best bushing ,it was a nice snug fit 2, so hopefully that will be the end of the problems
i hope

Norfe, found these just in case mate, hopefully you'll have sorted it though.

http://www.ebay.co.uk/itm/R-H-Crank-Seal-Yamaha-DT-125-dt125-R-/160701116305?pt=UK_Motorcycle_Parts&hash=item256a886f91

NORFE · DTR Trusted Engine Builder

yeah cheers nev, thats the one i bought , iv tried another oem one atm tho, its sprung both sides so see how that goes, just waiting to devour me sundy dinner then am off in garage

smile

NORFE · DTR Trusted Engine Builder

WHAT WAS THAT LINK U MSG ME NEV WONT WORK ???