1986 Yamaha YZ490

I am the second owner of this bike. The first owner parked the bike in the early nineties after removing the piston for some reason. I honed the cylinder and installed a Wiseco standard bore piston and rings. I also installed new Boyesen power reeds.
The combustion chamber appeared to have damage from detonation. I machined the head to clean this up and modify the combustion chamber which I have learned is a common mod for these bikes. I did put a smaller main jet in because it ran so rich it would bog shortly after half throttle. It had a 440 main, nd I installed a 400.
I have also completely dissassembled,cleaned, nspected and reassembledthe rear suspension, nbsp;
As you can see in the pictures the gas tank is cracked. So you will need a gas tank.
I don't think the bike has many hours on it. It appears to possibly have the original tires, hain and sprockets.
I have not put one hour on this bike since getting it running. I have just ridden it in the yard, nd around the block one time to make sure all the gears are there.The transmission shifts good, nd I don't hear any noise from the crank bearings.
The bike is hard to start. Which I have heard is common with these bikes. It has so much compression that it is very hard to kick, ut it seems like the softer you kick it the easier it starts.
It is missing the air scoop on the left of the engine. It is also missing a few misc. fasteners for the plastic.

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