This needle illustration may help.

 

No, don't remove the reed stops.

 

THanks guys,
Since i lowered the clip and he had a chance to ride it, it did run better. The other thing i want to do is change the front spocket down 1 tooth or so for more torque. I think this will also help it run better. What do you guys recomend for a sprocket and where to get it?

It is running and now does not smoke so much and it takes off a little bit better.

Thanks and keep the help coming. This forum is great.

 

My boysen reeds are the two stage kind. They came with their own reed stops. The instructions specifically said to remove the stock reed stops and use the ones supplied with the reeds.

 

[quote]
Originally posted by: bisho12
.... The other thing i want to do is change the front spocket down 1 tooth or so for more torque. I think this will also help it run better. What do you guys recomend for a sprocket and where to get it? .... q]

You can replace the factory 19T front sprocket with an 18T front sprocket from an '01 Polaris Scrambler 50. This will give your mini more power from say 4+ MPH and more but won't give it more bottom end take off. For more bottom end take off, changing the rollers is a better option.

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Thanks Spike,
How should i go about changing the rollers? I saw some posts where they take them out. Is this hard to do? Should i just change the sprockets and see what happens? He is 120 lbs 10 year old. He needs more torque for going over obsticles and climbing the hills. Top speed is not to much of an issue.

I should change the chain at the same time. Its an 2004 and we got it new. Can i use the same chain? Will it fit if i went up on the rear to a 39 and down one on the front?

Also does Billy Holt have these parts or is there another place to get them?

Thanks,
Bob

 

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If you install new sprockets, you should install a new chain. Unless the current chain only has a few hours on it. But, one should always change sprockets & chain at the same time. Save the chain & sprockets (if they are still good). These parts can be used as backup parts or to change the gearing back - if you sell your mini or pass it down to a different rider.

Front 18T 01 Scrambler 50 sprocket can be purchased from a Performance Dealer, from a Polaris Dealer or from Rebel Gears. http://www.rebelgears.com/pages/787898/index.htm Do shop around because prices do vary. We obtained our 39T Rear Sprocket from WRH Racing. I'm sure the other dealers or Rebel Gears sell it as well. Note: they sell a 38,39,40 rear T sprocket. We used a 39 but a 40 would work just as good.

Since your rider is heavy and you probably do lots of curd / mud with your Pred-90, I'd recommend a HD / HO rated chain. We went with the extreme quality / expensive RKO 428-HO chain. It's thicker then strock and thus, won't streatch / wear as much. Expecially on our crud / mud trails.

If you want, change the chain / sprockets and "see how you like it". If you are looking for momentium power gain and NOT 0 - 6 MPH "extra" power gain, then changing the sprockets might be the best option for your riding conditions. I do know that changing sprockets / chain is a "no brainer" upgrade. Especially if your chain is worn out and needs to be replaced anyway.

Not too many people are comfortable in taking a CVT apart and changing its rollers. But, each of us have to start some time.


Hope this helps as well...

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Mine are also. I removed the stock reed stops and used the ones that came in package. We had a knocking sound in midrange that was very noticeable. Tried alot of things to fix it and finally put stock reed stops back in. Noise went away. I think that the reeds where fluttering, slapping, something. I also think this may have been the rpm range that the secondary stop may have been opening. We had no problems at idle or full throttle range. Not a noticeable difference in performance between stops. Also our motor has been modified so this may have an effect over a stock motor. Harmonics can be a funny (sometimes distructive) thing in motors. These are just my experiences. If our motor didn't make noise I wouldn't have tried the stock reed stops again either. Also, Jon at Miniatvs said not to use any reeds without the stock stops as the reeds could hit the case. This may only pertain to stock reed blocks as that is what I was dealing with.

 

I think this will be a try it out kind of thing. I have the stock reed cage witht he Boysen reeds. I have Jon's top end magic on our Eton. No problems with the Boysen stops. Could be that I don't use Jon's pipe, so the sound wave is not slamming the reeds back to the closed position. Way to many variables to know for sure.