Quads from the past...

i have a 2004 Yamaha Kodiak 450 and it is losing oil but does not smoke what is it

I bought a 2003 Recon from a kid that beat it – all plastics cracked etc, When I replaced the rear brake the inside – axle, rear oil  - were clean and in good shape, so I think Honda won the kid vs quad battle.
It shifts a little clunky (I made the adjustment) and after riding for a while I get a hot friction material smell I wonder if he used the wrong oil and if any damage was done.

Introducing the 2020 Yamaha XT-R editions of ATV and Side-by-Side vehicles featuring exclusive XT-R features like a factory-installed Warn Winch, advanced suspension, special-edition paint and color-matched wheels with extreme terrain tires, all Assembled in the USA for unmatched Proven Off-Road capability, comfort, and confidence. 
YXZ1000R SS XT-R: https://yamaha.us/yYXZXTR 
Wolverine X2 XT-R: https://yamaha.us/yX2RSXTR
Wolverine X4 XT-R: https://yamaha.us/yX4XTR
Grizzly EPS XT-R: https://yamaha.us/yGrizXTR
 
 

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Introducing the 2020 Yamaha XT-R editions of ATV and Side-by-Side vehicles featuring exclusive XT-R features like a factory-installed Warn Winch, advanced suspension, special-edition paint and color-matched wheels with extreme terrain tires, all Assembled in the USA for unmatched Proven Off-Road capability, comfort, and confidence. 
YXZ1000R SS XT-R: https://yamaha.us/yYXZXTR 
Wolverine X2 XT-R: https://yamaha.us/yX2RSXTR
Wolverine X4 XT-R: https://yamaha.us/yX4XTR
Grizzly EPS XT-R: https://yamaha.us/yGrizXTR
 
 

i have a 1986 yamaha moto 4 200 and was wondering if i could put a 350 or 300 jug and piston on it to bump up the cc?