What are others running for weights and pin weight/locations in their 11 or 12 Pro's for 6000' to 8000' and for higher elevations like say Cooke? Also what are you seeing for RPM.
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MTX weights
- Thread starter 800poodragon
- Start date
68 gram mtx, tied clutch, 8050 rpm at cooke. It is a 12 pro. Slp reccomendation on helix.
I am running the tied secondary with SLP recommended helix and spring and SLP spring in primary using 64 gram weights with 2 gram weights in each hole. Was only seeing between 8000 and 8100 for the most part (6000' to 8000'). Going to Cooke on Tuesday and trying to figure out what adjustments I need to make being pins are only usable one time. SLP said to go with 1 gram pin in each hole for Cooke but if RPMs are going to be the same as here should I be trying for higher RPM's? How does inner and outter pins affet RPM's? Though maybe I should just try removing the one outer pin for Cooke?
How important/and what benefit/comes from changing the Helix? Trying to understand what this does, and what you changed from stock to now?
Have been running Carls helix in the stock secondary with the stock spring and the primary using stock spring with 62 gram Belly buster weights. At 6000' to 8000' would hit 8300 to 8350 sometimes. Put stock weights 10-62 in and brought rpms down to 8200 to 8250. That also seemed to pick up a tad on top end but lost a bit of torque as well. I had the tied secondary and another primary clutch so I set them up with SLP recommendations and wanted to see if that made a difference. Sled is a 12 pro with SLP pipe, PCV and head.
So, what I don't understand is that I thought the MTX weights were supposed to be 4 oz heavier. Since I ride at Cooke (8-10k feet), that shows as a 10-60 weight.
That should mean that I run 10-65 MTX weights, at most, but with the spring changes that SLP recommended, they're saying to run the 10-65 MTX with 3oz in the outer hole (68 oz). That seems like it'd be way too heavy.
Thoughts? Rationale?
Running, BTW, Blue/Pink in Primary, Black/Purple in Secondary.
Thanks guys!
That should mean that I run 10-65 MTX weights, at most, but with the spring changes that SLP recommended, they're saying to run the 10-65 MTX with 3oz in the outer hole (68 oz). That seems like it'd be way too heavy.
Thoughts? Rationale?
Running, BTW, Blue/Pink in Primary, Black/Purple in Secondary.
Thanks guys!
just a fyi 10-60 are polaris weights and the slp weights are just 65 not 10-65, and the weight is measured in grams not oz.
T
theultrarider
Well-known member
I'm at sealevel to 3000 so what I run means nothing to you other than to show the comparison between stock 10 series weights and through mtxs. With what I'm running for helix and springs, I'd be running 10-68's. I did and hit my r's where they should be. With the mtx weights, I'm running 71g weights with 2g in the belly and 2gs in the tips for a total of 75. So with all that said, I'd trust what slp is telling you to run in yours.
I am in Cooke this week trying things out. Been running the 65 gram MTX with 2 grams in the inside hole...will run 8250 to 8300 out of town on the trail, get up to 10,000' in the powder and goes to 7900 to 8000 rpm's but holds them. Late in the afternoon when it gets cooler it will pull 8100 to 8150. If I go to 1 gram in the inside hole I think my RPM's will jump to high.
800poodragon - that's interesting. I ride at Cooke and will be there shortly again. So SLP says 3g in outer hole with 65g weights (sorry on the oz, was thinking something else). That's more than you're running, and they said outer hole, where you say you ran 2g in inner hole.
Some are saying above 8100rpm, sled falls a bit, should I put the extra weight in there to keep it, even in the cold, at that 8000 rpm max?
Some are saying above 8100rpm, sled falls a bit, should I put the extra weight in there to keep it, even in the cold, at that 8000 rpm max?
Pull 1g out of the tip.
At this point I have not had any pins in the tip. Only one 2 gram pin in the inside hole. Today RPMs would hit 8250 to 8350 out of town on the trail and about 8000 rpm's at 10,000 feet.
H
High Velocity
Well-known member
I just ran my MTX's for the first time today. '12 Pro 163 with PA head/HPS can, 19/46 gearing and SLP blue/pink primary spring. Running from 3000-7000 feet. 68 gram MTX with 2g in the inner hole, 1g in the tip. At approx. 3000 ft, I was seeing 8200 rpm. I only got to about 4500-5000 ft today, but on a steep pull, it was holding 8050-8100. I have one little issue now. When I first hammer the throttle, it will spike the rpm's and hit the rev limiter for less than a second. Not quite sure whether I should load the weights a little more or go with a helix that has a little steeper initial angle. Other than that, sled is much more responsive and pulls harder. Very happy, just have a little fine tuning to do.
<Dumb Question Alert>
When you say inner hole and outer hole, is that in relation to the clutch itself, or where the bolt goes through the weight; i.e. is it
Bolt --> Outer Hole --> Inner Hole
<or>
Bolt --> Inner Hole --> Outer Hole
<Expert Response Appreciated>
Thanks guys!
When you say inner hole and outer hole, is that in relation to the clutch itself, or where the bolt goes through the weight; i.e. is it
Bolt --> Outer Hole --> Inner Hole
<or>
Bolt --> Inner Hole --> Outer Hole
<Expert Response Appreciated>
Thanks guys!
T
theultrarider
Well-known member
bolt>inner>outer
aka
bolt>belly>tip
aka
bolt>belly>tip
