Vintage Sno-X 540 XL-5 Setup?

sloTJ

sloTJ

Member
Joined
Jun 27, 2013
Messages
288
Location
Cambridge, WI
Hey TY! I need help/tuning suggestions for my vintage snox sled. I built a 1985 XLV 540 fan specifically to run leaf spring vintage classes in WI. Nutterville BeaterCross, Arpin, Ditch Banger, etc type events.

Current setup: bone stock engine, oil inj deleted, boyesen reeds, 40mm Mikuni round slide carb jetted 420m/45p, AA5 tube, 7dh2 needle, 2.5 slide, wahl bros throttle block, rsi bar setup, psi SRV pipe, stock gearing and clutching… tallest lug height you can run is 1.25.

What gearing and clutching would be best to run in events like these? Ditch the stock primary for a comet or P-85? Weights? Springs?

Improvements I know I need are higher engagement and snappier response clutching wise, somehow plastic skis on the leafs, hydro brake setup, newer ripsaw 1.25” SR-V seat… Anyone else with more experience on setup would be super appreciated! Thanks.
 

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All I got is that I would say go with the lowest gearing you can fit in there. I believe those things come geared to do around 80MPH. You will never need anything close to that kind of top end. If you do lower the gearing you will almost for sure need more primary weight. Not sure what clutch that year has on it. If it has the YP clutch the 570 Exciter 87M & 82M weight work better than the 8VO weights I suspect would be in a YP of that age. They are also heavier. Make sure the shift RPM is right. I know more about the old Phazers than SRV/XLVs. Good Luck
 
Back in the day...I had great luck installing a Polaris p85 primary and Polaris secondary on the older Yamahas. You would have to get a machine shop to modify the jack shaft to accept the keyed 1 inch Polaris secondary.
 
Maim said:
there used to be a company that made a leaf spring kit with plastic bottoms but have not seen it in years. ski skins allowed?
Click to expand...

I have them on my 1972 Moto Ski Grand Prix....nice addition for sure.


Plastic Ski Conversion Kit for John Deere, Kawasaki, & other 26

This kit includes everything you need to install a pair of modern plastic skis on your John Deere or other brand* snowmobile with 26" leaf springs**. This kit is a direct bolt-on for 1980+ Liquiire, Trailire, or Sportire. The benefits of using a plastic ski include better handling, less...
newbreedparts.com
 
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