i have a 1990 2x4 250 trail boss or blazer ? and on the left handle bar is a little button that when pressed with eng running will smoth out and raise the idle . what is it has 2 wires to it.

 

Does it do this in reverse or all the time?

 

its prolly the reverse override button so you can go full speed in reverse

 

all auto polaris have that little yellow button called an reverse override ride button. in the case for your bike it is so you will have fullpower/speed in while backing up. its designed to cut out the engine when its not being pushed in while in reverse for safety reasond.. welcome to the forum.

 

sounds good .it does change the idle in all gear ranges though. without pushing it the idle is loapinglike a old hit and miss engine.press it and she is smoth.

 

if its doing that in forward and reverse and doing it at idle, someting is wrong w/ the override. check to make sure the wires arent all corroded or the transmission switch isnt bad. this switch tells the override what gear your in so its not suppose to work while in forwards.

 

yhea check your override button!

 

Reverse limiter modules prone to failure on early models. Just pull black wire from module under headlight area that goes into terminal board. black kill wire there also. If doesnt kill with switch,wrong wire pulled! Or pay about $70 for new module,jmo not worth it. Will have full speed in reverse eliminating button. I Do it for customers frequently! Hope this is your problem,Good luck.