I have a bogging problem at low rpm on my Scrambler. I dropped my main jet from a 270 to a 260. This did nothing as the main jet is not being used at low rpm.

The spark plug is black coated, but not fouled. It is never the nice light brown color.

It only does it when I am going slow or taking off from a stop slowly. Other then that it runs great. Anyone got an idea? Can I adjust the idle curcuit to get crisper throttle responce at low rpm? Thanks.

'96 Scrambler w/RCR Stage 1 Kit, K&N filter, and Boyesen Power Reeds.

 

Raise the clip on the needle one notch , and return to the 270 mainjet. Out of curiousity , what are the numbers and letters on the needle? Polaris had a mid year change in 1996. Try this and lets see what happens .

 

It's on your jet needle, pull your carb. Clean, put you clip on the next notch up on the needle and try. Run a plug test after, this is common problem with season changes. You'll have to do this about every 30degree temp change. Keep moving the needle up until you get a light brown plug and the bogging goes away. Most likely one or two moves will do it. Good Luck

 

RickRitter,

Thanks. I will do what you have suggested. I will get back to you on those numbers too.

'96 Scrambler w/RCR Stage 1 Kit, K&N filter, and Boyesen Power Reeds.

 

If Rick's advice does not pan out, pull the bow and clean out the pilot jet. Also, may sure to blow out the passages for the pilot jet. I just had the same exact problem on a CR125R. I tried moving the clip, and it did not help. After cleaning the pilot and the rest of the carb, it is purring like a kitten.

Greg

 

I agree with Greg .

 

Always possible it could be needle & seat leaking a little, causing rich condition at low end!

 

It has been my experience that when the needle and seat are worn sufficiently to effect low to mid performance, the bike will not idle.

It sounds to me like this carb just needs a good cleaning. It is very easy to do, but most people go about the cleaning the wrong way. The best way i have found to clean a carb is to completely disassmble the carb. remove all the o-rings or rubber/plastic parts, and place all the metal parts into a solution of Yamalube Carb cleaner/Gas (50/50) Let this sit overnight, agitating the solution every couple of hours, then use a compressor to blow out all of the passages. This is a pretty easy process.

Greg

 

My needle and seat are brand new.

Thanks for the advice. I will let you know how it works out this weekend.

'96 Scrambler w/RCR Stage 1 Kit, K&N filter, and Boyesen Power Reeds.

 

Thanks all. I moved the clip on the needle up one notch and it cleared up the problem. It seems to have also given me more low-end power.

'96 Scrambler w/RCR Stage 1 Kit, K&N filter, and Boyesen Power Reeds.