87yz250 build

No it won't just bolt in, it may fit with some modifications but would probably need a lot of work to make it fit like fabrication of the mounts front middle, and also the upper mounts

The main thing would be swingarm rear main mount clearance

If you have the motor why not just try it in

An 86 engine would bolt in perfectly but you would have to run the 86 front pipe too as its different from the 87 pipe

My thread here may be of some use to you in your build process

http://www.vitalmx.com/forums/Old-School-Moto,22/Yz250T-1987-restoratio…