1988 Yamaha Warrior exhaust blows out of carburetor

[travis1995]

My dad said if I wanted a four wheeler I had to build it. Well it took me over a year to do it but now I am having troubles with the carubretor. My dad and I tried to rebuild it and we took our time doing it but the problems we are have are: we are getting exhaust blow out of the carburetor and exhaust out of the tailpipe it back fires at a high rpm and when we put the air box on the carburetor we have no acceleration. We have stop at a couple dealerships but they don't work on anything as old as my 88 warrior and have no idea. Can anyone help please. You can email me at [email protected]

Tags: Rebuilt Engine Carburetor

[DirtDemon]

My best guess is that your valve timing is off. Could be the ignition timing too, but I am leaning more toward valve timing.

Edited July 26, 2010 by DirtDemon

[superswire]

Sounds like its either way too lean, i would check that first orpossibly something in your valve train. Check all your jets and everything in the carb and make sure they are all correct. If you have a stock engine with a stock airbox, your jetting should be stock with the needle clip about in the middle and the air fuel screw about 1.5 to 2.5 turns out to start.

If its still a mess, just pop your rockerbox off and cheak to see that the cam timing and ignition timing are correct. Honestly though it sounds lean to me.

Be patient and if you dont have a manual, buy one and go through it step by step, you will get it right and it will be worth your effoerts !!!