Yamaha 250 Twin

[jjjcost]

hi guys i just got a late 70's yamaha 2 stroke 250 twin of a guy in my neighborhood right now its seized up so i have oil in the top end with the heads off, any good ways to unseize this other than how i am? im also planning on putting this engine into a yamaha blaster cause its engines blown and this ones alright other than the seizure. any ideas of how much hp these things made?

[climb any hill]

That's awesome, a twin cylinder blaster?? Wow!!! I'm waiting on that build for sure!
What bike/quad does this motor come from? How bad is the seize? I would remove the head, flood it with PB Blaster!

[rm250dude]

post some pics of it and ill try my bes to tell ya all about it and so will everyone else on this site

[jjjcost]

yea it will be pretty cool once i get it fitted in there lol its a ds7 250 from what i know, pretty cool lol the blasters gunna have two exhausts.

[climb any hill]

What pipes you thinkin of running & how will you set those up?

[flotek]

we need pics

[joe22883]

did teh early 70's rd come with a 250?

[jjjcost]

im going to use the original pipes for now and put them at an angle along the chassis, im pretty sure they made rd250s but i dunno. right now i a combonation of auto trani fluid and nitro lol maybe that will unseize it.

[flotek]

http://www.tz250racing.com/history_of_the_tz250_2.php to bad you didnt get one of these babies the tz250 yamaha sportbike,with porting the old rd's ca n really rip

[joe22883]

try some marvel mystery oil