400ex motor into stock 87 or88 frame

[bikebuilder]

i have a spare frame 87 and 88 laying around and have all the parts to build another bike and wanted to know if i can fit a 400ex motor or a 426yamaha motor into it. does any one know how hard it may be to do it

[Creech52]

Why not just use a R motor?
Also your gonna get some flames for wanting to hack up a good frame, but for the sake of giving you an unbiased answer you can basically fit either engine in fairly easily if u have some fab skills and the tools, your probably better off however asking in the Hybrid ATV section and also browsing around in there.

[rustyATV]

I guess he didn't like the pictures I put up in the thread he made in the Hybrid forum.