hey fossy, i talked to yamaha and they said if ur 426 is stock the 450 carb should work awesome..its a 39 mm bore..worst cause may have to put ur pilot or lift the clip on the needle one slot...let me know i can take one off and ship it to u , and u can look for one off ebay or something....
Fossy call me its les ,I need to know how much is left owing to you on the 440- cat you sold ,the fellow has the money but we need to know how much he still owes you ,call me at home 780-706-5018 its sunday sept 5 2008 732 pm alberta time call asap