Blew chain, need quick advice!

[Coxy]

Hey guys, went to load my sled last night and found it was locked up tight. Chain was holding on by 2 links, and the loose junk was bound up in the reverse idlers. Somehow the case survived with only minor gouging. Anyway, appears that it has a 18t top gear, and the smaller gear on the lower is 40. Since im buying a new chain now, thinking about a gear change too. 162x2.5 CE, 12psi boost for now, ride with the 2 stroke boys in the tree's and climb as well.
Pretty hard on belts, last one i had lots of black deep in the secondary, which is where my thoughts on gearing up come from. Would i benifit from 19, or even a 20t top gear?
Also, any of the BC, or alberta boys know where would stock a gear and chain i could get comming asap? Thanks!
Coxy

 

[BigFish BC]

better throw you clutching set up on here too guys will be able to help you better

 

[Coxy]

Currently has dalton adjustable weights, set around 72g. Black primary spring from Alpine, unsure what it is. 45* helix, EPI purple, trying a few different tensions. Im looking at getting a set of 8BU's to try. It works okay, but im thinking the gearing will help overall

 

[summitboy]

Which rollers and what is secondary wound to ? When you say hard on belts what does that mean ? Blowing up ? Pulling cord ?

 

[E&S]

Gears

780-997-3818 Darren, can have everything shipped out by tues for ya

 

[Coxy]

14.5 rollers, think I wound it 0-3? I'm new to torsion springs, cat guy ya know lol. Clutches hot and pulling cords. Last one I changed in revy left black all over the bottom half of the secondary. I wanna twist the secondary up more, but I ran out of weight.
Darren, appreciate it! I'll try and call on my lunch tomorrow.

Anyone have any input on gearing choice? Also just noticed it has a 70 pin chain, with 18/40 gears... Charts say 68 for that gearing?

 

[summitboy]

Are you pulling just cords ? If so i would be checking alignment. Just had a guy doing the same thing and the alignment was out 2.5-3mm from front to back on secondary (not square) You should be able to run that 19 with that track no problem. The only time ive seen the 18 needed was with a big 174. You gearing up is not going to fix this problem rather make it worse. Check the alignment first and let us know what you have. When you say Alpine black spring in the primary are you talking Yamaha Blue White Blue ? How many miles on that chain ?

 

[Coxy]

Ill see if i can strait edge it up and check for square for sure. She just gets hot hot. Even with lots of cool down time, venting, etc. Not sure on primary spring, havent scraped the paint off it yet like the secondary spring lol. Ill get a 19t gear and 68 chain comming then. No idea on the chain milage, dude i bought it from is a pathalogical liar. Im assuming its OG being a 70 pin, so my guess is 3000km or so. Sled was rebuilt after an avy and got a new gauge etc, so god only knows. My bad for not tearing it down sooner, but just lucky it didnt grenade and take the case apart in the back country. $1000 bucks or so just to get a chopper off the ground around these parts

 

[sledheadd]

I have the same sled with the same track stock gearing and I get over 500 miles on my belts.(I run up to 17lbs of boost)
I'm betting somethings not right.
With venting I'm seeing 75 to 90 degrees on the clutches after some good pulls

You'll want to run that epi purple at 0-1. IMHO

 

[BigFish BC]

Currently has dalton adjustable weights, set around 72g. Black primary spring from Alpine, unsure what it is. 45* helix, EPI purple, trying a few different tensions. Im looking at getting a set of 8BU's to try. It works okay, but im thinking the gearing will help overall

not sure on the black primary should be a blue white blue or pink white pink,make sure they are the 14.5 mm rollers.45*helix is ok but i like the 47*should have the alpine black or the epi purple in the secondary wound 0-1.if you are going through belts on the nytro you have something wrong ,out of alignment or snow getting on them.i have mine vented too run 15-18lbs boost a 174 x 3 track stock gearing no heat issue or belt slip over 1000km on my belt now.i run the dalton weights too the work great you should be pulling 8600rpm

 

[Tuesday]

I agree gearing taller is going to make it worse! As others mentioned, clutches, alignment, are prob the 2 big things to look at. Deep snow and riding hard is also hard on anyones belt. More venting and try to give the belt a rest once in a while is helpful.

One of the common yami set ups is b-w-b, 14.5 rollers, loaded bu's, epi purple 1-0, 44-48 helix on shockwave.

Lastly we change chains pretty much every year. At 3000km it wouldnt hurt to swap in new bearings throughout the drive system as well.

GL

 

[culvert]

You mentioned this was a wrecked sled rebuild. I would think you have an aligment issue if its taking belts out.
Get that checked for sure, & taller gearing is only going to make more heat, like everyone has said.

 

[summitboy]

I bet the its the alignment ! The wind won't matter too much in your situation. 10-50 will be fine. I would put a straight cut 47 and be done with it. Check that alignment !

Also keep a spare chain and 2 tubes of grease in the trailer and you can fix a blown case on the hill instead of paying 500-1500 for a huey !

 

[Sleds R Fun]

Chain Case

18 top gear puts quite a dog leg in the chain might want to try 19.
14.5 rollers, blue white blue primary spring, Fully loaded 8bu's weights. Found lighter weights good for tree riding. A heavy weight pulls hard and nice but I couldn't keep cords in when on and off throttle.
Secondary 47 helix, your black spring, and run some good tension as this will give you a nice backshift. However if you wind it to tight you will also take out cords. I run mine 3-3 aproxitmatly.

Good luck!

 

[Coxy]

Thanks a lot guys, got lots of ideas and opinions to work with now. Still trying to round up a chain, and maybe a top gear for this weekend. It's tough when I work underground on dayshift! Pain in my *** lol
Appreciate it!