wr 400 with 426 carb starting problems
Posted January 14, 2008 - 07:31 PM
Posted February 16, 2008 - 01:37 PM
I'm having the exact same problem! What the hell? The thing will only start with the hot start on. I plugged the vacuum nob at the intake.
Posted February 18, 2008 - 07:04 PM
All things being the same except displacement, the larger displacement will draw more are through the carb createing more vacuum, and draw more fuel through the same jet.
Stock yz426 uses 162 main, stock needle on 4 and 42 pilot
Stock wr400 (98) uses 168 main, stock needle on 3 and 45 pilot
You should check your feul screw and float setting, both will also make you very rich at idle.
Just some thoughts, hope they help.