Clutching advise/ suggestions from the Experienced tuners

[IDAHO HOT SHOT]

I went on my 1st ride today. We rode from 8500 9500 ft. The snow was 3 ft on the slopes, 3+ on the north sides and 2-2.5 on the south slopes. Much to my surprise, the snow had a great base for this time of year. I am riding a 2011 155 Pro. 58/40 helix with stock secondary spring, 19-42 gearing and 10-64's with a blue/pink spring. the tach showed 7850 - 7900 consistently all day. I'm wondering if I should drop the extra set of 62's in for the next ride but I don't want to gain too many R's. I'm also wondering if I should grind the 64's down to 63. Ideally, I'd like to run a Belly Buster weight, but I don't want to guess at $100 a set. Typically how much RPM is gained per gram? This sled pulls extremely hard and I am wondering if I should leave well enough alone...but, to me, there is always just a little more..........................
Thanks in advance

 

[AKSNOWRIDER]

Idaho, you need to check rpm with the memory recorder..for some reason the tach has a hard time keeping up with the motor...all day today mine read 7700-7800 when climbing in deep pow..but run the recorder and it was showing 7950-8100 with 44 to 49 mph track speed without uncovering the track on a bomb hole...yet on the one long steady pull I did it read 8100 for a solid 4 seconds on the tach(which matched the memory perfect when I hit replay)...if it is showing 77-7900 on memory I would weigh your stock weights on a gram scale and grind them about 1 gram lighter and match them weight to weight(grind on the backside toward the tip area...might even do a half gram to begin with),,1 gram off each weight is roughly 100 rpm...

 

[B00nd0ck3r4lif]

If im not mistaken 64s are recommended for 4-6k ft. With 64s when im riding from 4-6k I was pulling 8050-8150, previously when running 66s at 4-6k i was pulling 7900-8000 so i picked up a couple hundred rpms by dropping to the correct weight. These sleds pull really really hard when you are seeing 8200-8250 on the tach (so hard they feel like a mod sled at times). I think you will be pleased by the results of putting the 62s in.

I'm about to switch to a heavy heeled type of weight myself, being able to sling more weight should help keep RPM from fluctuating.

 

[2XM3]

agreed I run mine at 8200-8250 It loved the SLP mtx weights btw

 

[portaboy]

what do they come with stock weights for 7500 to 9000 feet

 

[WyoPro]

Idaho, we went to that same helix last year with a .36 rate...at that elevation with blue/pink in the drive and black/purple in the driven 10-60's should be right around 82-8300...go 9500 ft+ and 10-58's worked well....

 

[Greene Machine]

I checked the the 62s in my new sled and they were actually 62.4 on the scale so make sure you check them and grind them all to match.

 

[IDAHO HOT SHOT]

Idaho, we went to that same helix last year with a .36 rate...at that elevation with blue/pink in the drive and black/purple in the driven 10-60's should be right around 82-8300...go 9500 ft+ and 10-58's worked well....

Were you running 19 top though. That sounds light compared to what I'm hearing for 19-42.

 

[F-Bomb]

This sounds familiar...didn't we discuss this at a sled show?

 

[WyoPro]

Were you running 19 top though. That sounds light compared to what I'm hearing for 19-42.

Yeah, that was with the stock 20/42 gearing, tried 19-42 and didn't see an improvement.

 

[IDAHO HOT SHOT]

This sounds familiar...didn't we discuss this at a sled show?

Yep, finally got to hit the hills with it.