atc trx 70 swap??? [Archive]

killerklown

03-25-2009, 04:38 PM

I have a 85 ATC70, previous owner scwered up the head, so I'm looking for a cheap replacement. A guy may be willing to sell one off his 87 trx70 for cheap, do they interchange?

Vealmonkey

03-25-2009, 06:28 PM

Yes, they will intechange. Also if you can find a deal on a trx90 engine, it will bolt in to the stock location.

killerklown

03-26-2009, 02:15 PM

I have two differant motors here.
One head is marked: HM-F2 the other is HM-F5
One cylinder is marked SY-A3 the other SY-B2
Any ideas what the numbers refer to, or better yet, can you decipher this?
thanks again...

Vealmonkey

03-26-2009, 03:38 PM

Probably just some kind of manufacturing number or dating system. They should still be pretty much the same engine, no big deal either way.