I am new to this forum but already found so much useful information on the project I'm busy with. Thank you!
My 2002 WR426 had a heat seize and I got a 2002 YZ426 engine at a good price to replace it with.
I swapped the 2 engines out and installed the YZ CDI.
Valve clearances are fine, valve timing correct and spark test good.
The engine starts and idles perfectly but is slow at picking up revs and also start to backfire and run unevenly at higher rpm.
I did not get a carburettor with the YZ engine so is still using the WR carburettor.
Will this WR carb work as is or should I do modifications?
I am also still using the old sparkplug.
Edited by RooiBoer, April 07, 2016 - 09:43 PM.