My KTM is sad

[tommorth]

Was out at woodhill today haveing a great time zooming around some blue trails
when it started making a taping sound not load but noticable probibly 20 seconds later she tightend up and seized. After some swearing and some pushing I found somone who towed me back big thanks to that guy !! pushing in wet boots and gear sux.
Im at a bit of a loss as to why this happend seemed to be running fine
pulled the head and barrel off top of the piston is lunched ,crank is seized solid . I think the barrels ok not scratched although it looks like it may be cracked between exaust port and the small round ports on ether side

anyone got an idea ?

[Paulus]

Looks (and sounds) like detonation. Jetted too lean or an air leak maybe.

[Ixion]

Detonation. Preignition. Two strokes. It's what they do, is why we luvs them so

[4stroke]

i think i saw you come back on the quad with the lil trailer.
barty5 rupecop and cheese were out there to ohh and rupecop mrs on a kx85.
if you take it to a engine recon place they should be able to do a crack test on it.

[Reckless]

i think i saw you come back on the quad with the lil trailer.
barty5 rupecop and cheese were out there to ohh and rupecop mrs on a kx85.
if you take it to a engine recon place they should be able to do a crack test on it.

Jeepers we should be more organised!!!!!! I stayed home as I didn't think anyone from KB would be out there?? Bugger it!!!!! What do you think KB is for Grrrrrrr!!
Bummer Tommorth!
Pre ignition won't make the crank Seize and put those ring shaped the pits in the head. Looks to me like a bit of the ring or something has been bouncing around in the top end then locked it up! or then gone past into the crank area and locked the big end. Is the big end still locked up with the Barrell off???
Also have a look at the plug colour to give you an idea how lean it was running when it crapped out!!

Either way cancel your cheque and get on the phone and find out what the bloody hell the guy did to it before you bought it!! It should have lasted more than an hour unless you altered something before you rode it.

Fuck that's a bummer!!!

[theblacksmith]

Bits of piston skirt cracked off maybe? lodged in crankase and some might have come up through ports into chamber?? One theory. Check bottom of piston.Bummer aye.

[gammaguy]

probably done a big end and the marks are where the bits of bearing hammered the piston crown before escaping thru the exhaust ports.

stripdown the whole engine and check it out,find out why it did it or it will do it again after you rebuild it.which sucks.

[tnarg]

Shit thats not cool, first ride on bike and it dies. Ring the guy and see what the deal is. Did you check the bike out before riding it ie: water.oils etc ?

[barty5]

fuel mix ok???

[laserracer]

Sorry to hear about the new bike,i bet you were madAs long as you havent tampered with it since purchase and are useing the right premix.. i would contact the guy who sold it to you you maybe able to work out a deal ...or theres always small claims court

[Reckless]

i would contact the guy who sold it to you you maybe able to work out a deal ...or theres always small claims court

Yeh I would too!! If its the bike that had the add on headlight, sounds like he likes to have a fiddle and could have done the engine work himself. If you don't know to do the end gap on the ring B4 fitting it or are just to tight to replace the C clips in the top pin or don't turn them in the groove so the gap is opposite the hole, its the little things can cause this sort of stuff. Get onto him pronto so he knows it crapped put after an hour even if he spends some of the money you gave him to buy the parts it'll be a help for you!!

[tommorth]

fuel mix was 40-1 tts and 98 from bp only thing i did was take the lights off and change the fuel line as it was staritng to split and clean the plug.
The guy seemed very genuine dont think he really wanted to sell it
I had a pretty good look at it before i bought but im not an expert it seemed rich if anything heaps of spooge . I talked to him earlyer today think he's gonna stump up some but probably not a huge amount .

gammaguy The marks in the top of the piston and the head look like somthing has been bouncing around even some small rectangular bits still stuck in the piston and fixing the broken bits then having it happening again is what I'm worried about .

tryed taking a pic of the plug but the flash makes it white but its black with coppery spots on it

any recomendations of a place to get to rebuild the crank?

[Rupe]

any recomendations of a place to get to rebuild the crank?

I see your out west, so try to avoid the one in helensville.

[gammaguy]

yup,shes done a big end for sure.its a wear and tear thing although many factors can exaggerate it.use the best oil you can and also dont run it too lean or too rich.with a 2T,carburation is King.

get it rebuilt by someone with a good reputation,i could point you at a good place here in CHCH but probably not much help to you up there.

[cheese]

Spectrum are pretty good, but generally flat out.