will a 1997 300cc engine and transmision fit in a 2003 250cc fourwheleer?

 

Not likely at all. You can shove it in but you would have to do lots of fabrication to make it run.

 

exactly how much would it take?

 

They have different wheelbase, 43.9 vs 44.3 inches. The bevel gear outshaft on 250 is shorter than 300 also. Not only that, the motor mount brackets on 250 frame will not fit with 300 engine. Like I said, the engine will fit inside the frame craddle, but you've got tons of work to do make it work. I wouldn't do it.

 

im wondering how much it cost for a 250cc 2003 bayou engine or any bayou enging that could just be put in without modifications, my cousin sheered the head off the bolt (assuming he hit a rock) and the rest vibrated loose, he noticed it was losing oil, so he tried to make it back (3 miles from camp) he made it about 1 mile before seezing the engine.... so thank you for your time

 

If the engine siezed due to loss of oil, it is likely that the only damage is to the top end.

I had a Bayou 220 that siezed due to loss of oil. All that I had to do was rebuild the top end. Bored out the cylinder, put it new oversized piston and oversized ringset and and wrist pin. It runs like a champ to this day.

The only difficult part was getting the wrist pin out. The wrist pins push out with a special tool. This one would not budge. So, I stuck a rag in the opening in the crank case to keep any shavings out and used my Dremel to cut a groove in the top of the piston. Using a plain screwdriver, I split the piston. All that was left was the wrist pin in the connecting rod. Turned out the reason it would not budge -- some of the aluminum from the piston had melted onto the wrist pin. So...using my trusty Dremel once again, I just ground off the melted aluminum and the pin came out OK.

Total cost of parts (plus labor to bore out the cylinder): about $200 as I recall.

The feeling I had when I got it running again when it appeared all was lost -- priceless!

 

but would that be the problem with a 250cc.... there have been things that were changed from the 220 to the 250 from what i have heard

 

Get to the bottom of the problem and fix what you got if you can't find another 250 engine. It is a simple air-cooled engine. An average skilled guy can remove the engine from frame and split in half in less than a couple of hours on this bike. Replace what's damaged and put it back. The 220 engine should fit in perfect if you can find one. Fix it!