Don’t know how much they are, but if your going to change anything I would recommend going with a full kit from a reputable shop.

 

Adjustable is the way to go. The SLP Magnum Force work great without a spring or helix change over stock. More to be had for sure with other components.

 

we will be testing these this winter. but i already know the 650 and 850 long stroke motors do not like any tip weight. so i don't see these being any good really? i could be wrong but i don't think so.

 

Remember that being stated in a different thread. Also, remember you stated the belly busters were slight better then the magnums. Like the low end belt grab of the magnums, but don’t neccessarily need the adjustability. Sort of hard to tell where the weight is. Not much meat at the end of the tail and at the heel ,and a bunch of meat in the middle. I’ll be interested in hearing the results.

 

what really works well in the 850's is 11 series weights. and these have no tip weight all in the heel. four strokes use 11 series weights. in the older 800's it turn these into rockets down low but had no top end. struggled to reach 100 mph. the 850's seem to top end very well with these. we ran out of winter as we were testing these. but my first test were pretty amazing. again no tip weight. lost a 1/2 second et. in 1000' on the snow and 3 mph. that is huge. but we need trail and deep snow testing before we make a change.

 

EPI version are the torquers. Did you have to go up a couple grams over the belly busters?

 

down.

 

Hi Rick, are you still recommending the 76 belly buster over the slp magnums after another season of testing?

 

yes they just seem to really work better in a wider range over the slp magnums. to the point none of our trail sleds or our race set-up 850 have them in it. still if your changing elevation's etc. or deep snow riding mixing it with trail riding the magnum force do work here. it's just in perfect hard packed conditions it pretty hard to beat the belly busters.

 

They have the Pros in 76 gram. That is the heaviest in this style.

BELLY BUSTER PRO WEIGHTS - 76 GRAMS - BBP76S
$134.99
Part #:
BBP76S

 

If you’re going to try them, go with 74s, that aggressive profile will act like a 76.

 

I've navigated from Dalton's adjustable to SLP Magnum adjustables and now into the 76 Belly Busters.
I know you've been testing different combo's of clutching this year.
Curious if you've found a weight that has turned into your "GO TO" weight?
I've been happy with the Belly Busters but never stop thinking about it.
Was thinking next year try 11 series or some of these others discussed.

 

I have a set of used 74 belly buster pros I would sell
They act lighter than 10-11 series I think. There is no tip weight. 74 pro buzzed along at 8300 with stock everything else on 22 xcr. About same as 10-72

 

So do you personally feel the standard belly busters worked better for you? This seems to be the norm. EPI explains the pros as being a Improvement but not the feedback or from real world testing by some reputable tuners....thanks! If we are looking for 8050- 8100+

 

I think the belly busters which would be Polaris 10 series work well. 74 up to 78. I like the epi torquer weights also which would be Polaris 11 series. 74-76 gram. 👍🏻

 

The pros need more tip weight imo

 

The 74gr pros I tried actually turned more rpm the my 10/72 weights. 11/74’s pull way harder then both the pro’s and the 10 series.

 

Any reshimming needed for spider with 11 series?

 

I agree
I always used STM weights on turbo cats because you can load accordingly
Anyone tried a set ?
Just curious but as stated above I would use a 10/76 or a 11/74 for close results. Heel weight is good on the 850.
Next season I’ll try a set of STM weights I think just to see how they work.

 

I agree
I always used STM weights on turbo cats because you can load accordingly
Anyone tried a set
Just curious but as stated above I would use a 10/76 or a 11/74. Heel weight is good👍🏻 On these it seems. For changes with helix and conditions I may try a set next season.

I have a set of those( STM) in my Yamaha Apex and love em.. I actually learned a lot buy using these weights. Quality weights too!

 

I ran flat profile on my cat turbos. I would think if I run the same profile as a Polaris weight with an STM they could be made to work pretty well. I always had good luck with them so I think I’ll try them next season. Can add 14 grams to heel, mid, or tip and anywhere in between 👍🏻

 

Anyone trying these EPI belly busters in a 650?

 

I found this old thread and just wondering if anyone had some real world results on the belly buster pros or the standard belly busters on the 850's.

 

I tried the Pros last year and didn’t like them. They were good at holeshot but they were slower going down the track. The 11 series work really good at the drag strip but not the best for trail riding. The 10 series profile works good for all around conditions which is why I use the SLP magnums for my trail sled, easily change weight based on conditions and temps.
I scored a set of Heavy Hitters from Fett Bros for $50 on clearance so I’ll try them as soon as we get enough snow.

 

I had great luck with STM weights. Quality, easy to adjust and well supplied info and tech. Loved them on my Apex. Most consistently recommend and go to weight on the Polaris is the bell busters.( 10 series)

 

So I changed the bushings in my slp magnums and there is still just slight wiggle in them compared to polaris 10-72s. Is this normal?

 

Polaris weights are nice and snug when new.. good thing. Doesn’t take long at all and they are broke in nicely. This is if your pins are not wore.

 

Just thought new bushings would snug them up a bit better. Obviously they are better than they were but just not what I was hoping for.

 

belly buster pro's arn't that good in the 850's. just like above good hole shot. slower down range and suck on the trail.