I picked up a 190 jet for my trailblazer and i installed it about an hour ago and it will not fire. I was told i needed around that big of a jet but it doesnt want to fire. I had moved the needle up one position when i had just the pipe and haven't changed it yet. What is the problem?

 

Could you have fouled a plug?That is a very big jet for a 250.My HPD modded and ported 250 runs a little rich with a 160 and the needle in the middle.drop down to a 170 and a new plug get the clip back in the mid or you could mess up your midrange.Get the top end right first then work down.

 

it sounds fat to me to i was thinking about 160 also.

 

See i have been running a 150 and a couple people told me to go 190 or 180 and i couldnt believe i was that low on the jetting. Your right my midrange really sucks with the needle position. Thanx for the advice. And i had just put a brand new plug in.

 

It dont take much to foul a plug.And a little advice dont listen to non Polaris people when it comes to working on them[img]i/expressions/face-icon-small-wink.gif[/img]

 

i got my jetting right with a 180 main and the needle at 1 position about stock. this is with a pipe, porting and no snorkel with a twinair filter.

 

With all my mods i couldnt even get a single fire with a 190 even after i checked to make sure i opened up the hole on the jet and just wouldnt fire. Then i put the 150 back in and it fired up after about 10 pulls. I'm planing on picking up a 160-170 jet today.

 

put the 150 jet in i had starting problems also change the jets starts great now[img]i/expressions/face-icon-small-cool.gif[/img]