DT125R ARCHIVE

xk120c · DTR Member

DT125 Engine Let go!

fray · Guru

Looks nasty mate. Defo needs a fresh top end and maybe a rebore. Get the cylinder off and check and get some more pics up.

craigbulmer · Guru

Will defo need a rebore looking at the state of that piston.. its fecked lol..

DeeTee · DTR Senior Member

looks like another case of the piston colliding with the power valve, not the first time I have seen that...remember 'satelite1' ?

topgunmaniac · DTR Member

OUchhhhh Collision,, Top End Rebuild Incoming :P hehe, Nasty man, Hope u dont Need A Rebore, But it looks like the case here

DeeTee · DTR Senior Member

But will it take a rebore? Think about it IF it collided before and you re-bore and fit a bigger piston....Dohh!!!

Only speculating but do you see my point?

SimsonS51E · Guru

Big Question Here ...

Is ...

What's the scenario for the piston hitting the powervalve ?????

DeeTee · DTR Senior Member

SimsonS51E wrote:

Big Question Here ...

Is ...

What's the scenario for the piston hitting the powervalve ?????

I wondered if it has similarities to this incident

http://www.activeboard.com/forum.spark?aBID=66365&p=3&topicID=34662185

SimsonS51E · Guru

Nasty !

RudiRulez · DTR Senior Member

seen quite a few thread lately where people pistons have been wrecked by there powervalve, what the hell is going on!

http://www.activeboard.com/forum.spark?aBID=66365&p=3&topicID=35607170

http://www.activeboard.com/forum.spark?aBID=66365&p=3&topicID=34662185

plus this thread, and theres another somewhere i just cant find it.

-- Edited by RudiRulez on Friday 28th of May 2010 12:39:50 PM

craigbulmer · Guru

Satellite1's near enough had a reason.. full chat at 80 mph for 15 miles.. what did he think was going to happen!

BUT
these other two :/ weiiirrdd

This one has probably been rebuilt a good few times, 90ish year one. Maybe taken too far back. Hmmm.

Sarks isnt old and only 6k, his is the most mysterious tbh :S

-- Edited by craigbulmer on Friday 28th of May 2010 12:49:27 PM

Dickhead · Nonce

mine just let go at 13000 miles looks like the ring wore past the limet then sliped past the locator pin causeing it to exit the exhaust port just pinned it all the way home

satelliteone · DTR Senior Member

i can do 80 all day long now.. i regularly do.. not at 15 miles either. like close to 30 miles each way from the GF`s. done over 1K on my present set up. Very realible at 80mph, no impact damage either. kweeelioo

Soz to hear, looks like a P.V fail to me. Has it been over bored?