Muddy Run

I have a Yamaha 350 in at once to try to fire up but won't. It's getting gas fire air and it has a lot of compression but still struggles to start check the timing it's top dead center valves are good valves are adjusted everything's working but won't fire I put my hand over the carb suck in gas and it tries to but it makes a lot of black smoke. Also when I put my hand over do you carb and tried to start it there's black black nasty stuff in the gas. So I don't know if it's trying to burn too much or what it is the gas tank clean and it anything to do with the gas it's with it firing. Took the spark plug out and it's pure black. What is dried up black not nasty corroded wet looking. Need help to solve the issue

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
 
 

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
 
 

View full post

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?

I have a 2001 yamaha warrior YFM350x and started to work on it. The person who I got it from put a new top end kit in it. I already took the top end off and checked, brand new still. Had to clean the valves so it can get better compression. Put it back together and turned it over and and made good compression but also had a loud clanking noise at the bottom, put hand over carb and stopped making the noise when I turned it over. And won't start.  I know it is not the top end. Just cleaned it and valves. Need help trying to figure out what's the problem.. thinking it's the crank rod but don't know. If it is the rod can i just get a new rod for it?(would be great if so). Or does it need a hole bottom end . In need of help.