Trailblazer 250. Sluggish and dead spots in throttle.

Where is a good starting point for the air/fuel mixture adjustment??????

 

1-1 1/2 turns starting point. REMEMBER air/fuel MAINLY for idle. Needle position,wear on needle,jetting,needle and seat should be checked also along with clean air filter.

 

OK, 1-1.5 turns???

Does that mean turn it all the way in, then back out 1-1.5 turns?????

 

TURN screw clockwise until LIGHTLY seated,turn out 1 turn initially.Crank engine,continue turning out SLOWLY UNTIL engine rpm drops or begins to run rough,turn back in,LISTEN to engine,rpm,stop at a GOOD idle. Should end up between 1 1/2 - 2 1/2 turns out. JUST takes a little practice. Good luck

 

Correct! JUST dont tighten screw down hard! Just turn clockwise till LIGHTLY seats,then turn out and try 1 turn out,can adjust while running, turn adj screw out from initial setting until engine rpm drops or runs rough,then turn back in till you get a good idle. Just takes a little practice. Good luck

 

ok thanks alot...also.....what do you think of the mikuni tmx flatside carbs.....

is it a good upgrade.....also what size would I get.. 35 or 38 mm

thanks again

 

Dont really recommend for the 250 piston port engine,cost will outweigh the benefits! GOOD engine,but not a firebreather even with mods. Can bring out a little more hp with aftermarket options that are available.

 

I noticed its not a screamer. Just want to get rid of the dead spot/spots in the throttle. It drives me crazy.

Guess I could get a rebuild kit for the factory carb and go that route.

Plus the TMX is actually cheaper than a new factory carb