Does oil come up the conecting rod? I have tried bushings for gears in the past. Brass won't work. Bronze is ok and oilight is ok but softer. That thin will need to be pressed in than reamed while it is installed. The material will compress when you push it in there. Expanding reamers work well to creap up on the size you need.
The bearings/bushings in the connecting rods are brass. I've got this motor completely broken down, i know the inside of these motors like the back of my hand.
How ever, there's more bad news...
CFMoto designed these cylinders with VERY THIN lining. When I let them know I found a company that wanted to make aftermarket and over sized pistons, I got this response:
"Emerson,
That would be a good option if it would work however, we do have a few small obstacles.
1. We use a cast in liner, this design offers great heat transfer at a good production cost. Trouble is, the actual liner thickness is not so much and boring could compromise strength.
2. We use a progressive hardness, this means the deeper you go into the bore the softer the material. The best wear surface is the original bore diameter."
So, over sized is not an option unless the BRP cylinders would fit (which they appear to), but the cost to get them, plus the cost for be to have the pistons made wouldnt be worth it.
I could also go with STD sized pistons with and higher compression, but I have no way of replacing the bearings with a higher quality bearing since they are all "sheeve" style bearings, and not your typical roller bearing. I would also need a more aggressive cam to deal with the higher compression.
Over all, other than the basics of adjusting fuel map, better flow air filter & exhaust, CFMoto has closed the door on any significant performace modification. I think this is a VERY bad idea. People love and go after CanAm, Polaris, ect because of the potential and things that can be done. These were designed in a way where nothing worthwhile performance wise can be done.
Bums me out for sure.