I have a 2000 trailblazer 250. The quad starts and runs fantastic, however, if I let it idle after start up the RPMs come up just enough to make it grind if I try to gently put it in gear. If I do a quick motion to "jam" it in gear, it goes, but makes a clunk sound. I am sure this cannot be good for the transmision. Once I get it in gear it continues to idle smooth and I can move from forward to reverse gear with no problems. If I place it in nuetral again the RPMs come up again just enough to make it hard to get back into gear. The quad is stock with the exception of an oil pump blockoff kit. How do I adjust the idle to keep it running but slow enough to be easy on the tranny. Thanks for any info.

Keith

 

I don't have a trailblazer, or have ever had one, but usually most carb'd machines have a idle adjustment **** on the left side of the machine right next to the carb....your other choice is to adjust the throttle cable....

 

yes the idle is on the left side on the TB just like any polaris... start your machine make sure it is good and warmed up... then revv the engine slightly let the RPMs settle and slowely turn the **** until u think it sounds slower, then revv the engine again to see if the RPMs rest at the same speed, u can usually tell by the sound. remember to keep trying this until your quad doesnt grind anymore or runs too slow. by the way your machine will have a harder time in the cold warming up with a slower idle also

 

I adjusted the idle on the carb down. I understand the throttle control on a Trailblazer is electronic. I also adjusted the barrell on the cable just down from the thumb throttle this seems to help a little but at times it still reves just a bit to high which causes the grinding or clunking. Thanks for your info.

 

Sounds more like the primary cluch not releasing all the way.This lets the clutch turn and it will grind going into gear and once you get it in gear it releases.Take the cover off and look at it while it is running the back clutch and belt shouldnt be turning.

 

Thanks for the info. This makes sense, I will pull the cover and check it. Did you mean when at idle in nuetral it should not be turning? If it is turning, how do I fix this? Thanks

Keith

 

My Sportsman did the exact same thing. I would put your idle back to where it originally was and focus on the clutches. I'm betting it's one of two things.

1. Your clutches are slightly out of alignment, which puts the belt in a bind at idle, which causes the primary to spin when it shouldn't. The longer it spins (i.e. Idles in neutral) the faster it goes. Thats why its hard to shift when its been idling for a while. Your dealer should have a tool to check clutch alignment. If it is out of alignment, all you have to do is either add or subtract shims behind the secondary clutch until its w/i specs.

2. Your belt is miscut slightly. You can check this by comparing the size of the outermost ribs/teeth on either side of the belt. If there is a noticable difference in size, this might be your problem. If the ribs/teeth are not symetrical on both sides of the belt, it won't ride in the center of the one-way on the primary clutch. This causes the belt to rub on one of the primary sheaves, which causes the primary to spin. You can try to fix it by installing the belt the "wrong" way (i.e. Having the lettering on the belt upside down if its read from the left side of the bike). Or, you can just install a new belt.

Hope this helps!

 

ftwflh and Enganear have it exactly right. There is a small chance your idle is a bit on the high side, but you really have more symptoms of a clutch issue (alignemnt, belt, need cleaning, etc)

 

my idle is on the right side of the carb? did u mean the throttle cable adjustment or the idle ****?

 

check your shims also... u need a tool to do this, if there isa big enough gap the clutch with press on the belt