Discussion Starter · #1 ·
Hows it going, new to this forum im generally a Yamaha type guy, but I'm helping a buddy of mine fix his old fourtrax and cannot seem to get this thing to run. So I've already went through a couple of basic tests, compression test gave me 120psi at w.o.t. a spotless carb, disconnected the airbox, etc now for the interesting part, first I'm noticing the fuel pump isnt coming when I'm trying to crank it. I tested fuel pump and it works great, I am noticing it dosent kick on even to prime it when I drain the carb bowl.amd second I'm old school when i test for spark i just pop the spark plug out put it back in the coil and ground it to the engine.the weird thing is when I have it touching the engine no spark, but when i pull it off the engine so it's not making contact it will actually arc to the engine. I'm almost able to stretch the arc at least 1.5 inches but the second I make contact with the the cylinder boom no spark.ive never seen this before and not really sure what it means. I'm thinking to just try and hook up a on old gas tank and try to see if I can start it by gravity feeding the fuel for test purposes so I can eliminate one or the other from the equation.but any help would be greatly appreciated!