1982-3 Yamaha 400 doesnt start..

[yamatrike400]

Yup i've seen your article. very nice. I'm going to be doing this head mod.
Yz 490 tips and tricks and the head mod diagram

Mine melted the piston because i was too lazy to buy a new air filter for it...And yeah i don't care what the 490 haters say, i love the thing. Simplicity, Power, Speed.