I bought a used 2003 Trailblazer 400 - 2 stroke ran good for a year or so now it keeps fouling plugs. I was hoping someone could steer me in the right direction for locating the problem. Could it be the injector? It just doesn't have the power it used to have and is very difficult to start. What also would be the correct spark plug? Thanks for any help or suggestions!

 

have you done a compression test? chances are it needs a new top end. also maybe the the oil injection isn't set correctly or too much premix if you go that way.

 

What should the compression be at? I use the injector to mix with gas. How would you check the injector out for putting out to much oil? Thanks

 

the compression should be at least 100 psi or better to have it run good. not sure about the adjustement if it has set marks on the pump. if you look at where the cable pulls up on the injection pump there might be alignment marks. either the way there should be an adjustment on the cable end. maybe someone w/ more knowledge for sure on the prpoer adjustment will chime in.

 

I will check the compression in the morning. Would you also know which spark plug would be best to use in it? Thanks

 

try this
//http://pi54.com/corp/manuals/Owners/9917859r03.pdf
' if it didn't work then its a ngk br8es/ gaped at .o28