I have a 1995 Xplorer 400 4x4 and it wont idle to save its life.
When it revs down it will back fire from hell. The Plug is black in color and where the exhaust comes out it is wet and black. The quad will run out pretty good but wont idle. This is my first quad so i dont know much about them. I am mixing it 40:1 .
Please send me some helpful info.
Thanks Daniel

 

do a compression check

 

i will do that later today when it warms up. It is 48 degrees out right now.

 

okay did a compression test and it was about 96psi
what should i do now??

 

Rebuild the top end, new piston, rings, and bore. Good luck Doc

 

I tore the engine apart and this is what i found.
Tell me what you think and what may have caused it.
Where can i get discounted parts for it.
Thanks Daniel

 

DOnt do discount parts! Go with Wiesco piston kit , factory gaskets(400s dont work well with Cometic or cheaper gaskets) get the piston from the shop that does the boreing.

 

should i do a overbore? say like a 1 or 2 mm overbore?
since i am already gonna have it all apart.
Thanks Daniel