DT125R ARCHIVE

medxb183 · DTR Senior Member

my piston

Seiki · Admin

Crap in your engine maybe? Moved to correct section

Spartan · DTR Senior Member

Exact same thing happened to mine pretty much in the same place too:

Forced a rebuild. I put it down to heat, I couldn't find anything else that could have caused it. When i got the bike there was little to none coolant in the rad when i emptied it as the red light was coming on constantly, the previous owner must have had it overheating often or something. I think the damage must have already been done and shorlty after it gave up.

After the rebuild and service it's been great since though.

NEV · Guru

My lads Speedfight piston was exactly the same, and that was down to a semi-seize, due to the oil pump not working properly, a common fault on Speedfight scooters. Twice his did it. It can be down to something as simple as not bleeding the pump properly, (air block)

My monies on the same with your pistons too! Thats why alot of people go pre-mix.

-- Edited by NEV on Monday 2nd of May 2011 12:28:36 AM

medxb183 · DTR Senior Member

thanks for the replies,im not going genuine parts this time,im thinking of using a Mitaka piston set....

CooS · DTR Senior Member

Sam happened to my old speedfight 2 scooter it was heat seized new piston and barrel had to be brought!

DT-R_bradders · Guru

medex that piston that broke..wat was stamped on the inside m8 be interestin to know wat make tht piston is???

bkray · DTR Senior Member

Mitaka is no good in personal experience, although, think im the only who has had issues.

medxb183 · DTR Senior Member

DT-R_bradders wrote:
medex that piston that broke..wat was stamped on the inside m8 be interestin to know wat make tht piston is???

genuine yamaha cry original from when the bike was new