Yes Kymco does produce parts for the other manufactures. I really don't like the mongoose 300 though. My friend bought one for his girlfriend and it is tall a narrow. My daughters TRX 250 EX is the same width but doesn't feel near as tippy. One problem I see with the Mongoose 300 is it is an entry level quad with an automatic transmission and easy to tip over. Its the perfect combination for a beginner to jump on and get hurt because they don't know how to ride a quad.
My friends girlfriend wanted an automatic because she didn't want to think about shifting. Guess what, she just got thrown off going around a corner on a fire road because she wasn't leaning. She was just setting on it giving it gas just like I warned him about when he was looking at buying it.
I am not saying it is a bad quad other than I really think they should have made it wider since it is a tall quad.
Kymco's are better than Chinese quads but I will stick to the big guys myself.
08 KFX 450R
Pro Armor A Arm, Frame and Swing arm skids, Dominator Bumper, Pro Armor PowerGRIP Nerf Bars and Pro Taper bars.
07 TRX 400 EX
Pro Amor A Arm, Frame, Swing arm skids and Fat Peg nerf bars.
07 TRX 250EX
92 KX 250
Custom Sandrail