Apex se chaincase sprocket swap

[L.Rossiter84]

I got a 2011 Apex Se. Thinking about switching from the stock 24/37 sprockets to a 25/37. Adding one tooth to the top. Factory chain length is 70 links.

My questions are

1. Will my stock 70 Link chain be long enough or will I need to purchase a 72 link chain
2. Will there be enough room at the top of the inner half of the case to clear the chain and bigger sprocket without it attempting to self clearance lol.

Thanks in advance y’all!

 

[Stubbs]

Why? The sled is already over geared…

 

[L.Rossiter84]

I wouldn’t say it’s over geared, it has all the torque in the world to overcome the extra tooth. Another upside to it is if your putting on long miles it should (very small amount). Lower fuel consumption a little. What would you suggest instead of going a gear swap

 

[steiner]

I dont think you will see any gains. These machines are geared and clutched very well from the factory. I dropped in a 24 tooth into my Attak last season ( factory is 23). So far I have seen no gains in mileage or top speed (GPS)

 

[L.Rossiter84]

I dont think you will see any gains. These machines are geared and clutched very well from the factory. I dropped in a 24 tooth into my Attak last season ( factory is 23). So far I have seen no gains in mileage or top speed (GPS)

Okay, what’s something you would suggest to get alittle more out of er

 

[steiner]

Depends how much you want to "get out of er"
Air box mod and a fuel controller would get you a little bit.
Yamahacharger will get you about 20hp more ( Hard to find these days)
Turbo or supercharger, where your wallet is the limit

 

[Stubbs]

Gear Calculator - Hurricane Performance

To use our Hurricane Gear Calculator, fill in the fields below with appropriate information. Then click on the Calculate button when you are finished.

hurricaneperformance.ca

Here’s a link to an accurate “gearing to speed” calculator. Plug your numbers in and see why gearing up doesn’t really make sense. If you’ve got adequate traction gearing down will yield faster acceleration. When I was running a gen 2 Ape I had a modded airbox and appropriate mapped PCV along with aftermarket clutching. I routinely used a little less fuel than the stockers in my group and my sled had a performance advantage as well. Like Steiner said though, the parts are getting hard to come by these days.

 

[sideshowBob]

IMO:
I have had an Apex since 2007 and if anything I would gear the sled down a bit to 23/37 but you would need a 68 link chain. I have tried numerous gearing combinations and higher gearing never helped with top speed or trail performance.
On my Yamacharged Apex Attack[136"] I currently use 22/40 gearing with a 70link chain and I find its the best gearing combo I have used.
Works for me!

 

[hydraulic yam]

Any test drives or adverts show these sleds being driven like you stole it.
Maybe lots of fun , but not good mileage.
Probably your best mileage will show up when the skis and the track have
gone the same distance and driving like you have your wifes horse
in the trailer .. basically no spinning up furrows and skidding to stops just
to do it again. Ride at speeds you don't need to be sliding around on the
seat just to keep from flipping etc.
BUT lets face it .. most people didn't buy an APEX just to drive it like a
VK ... You bought it to have fun .
Carry a bulb siphon and a 1 liter container to scavenge some fuel from buddies
when you come up a bit short.
I drove an 40th anniversary Apex long track for a test ride at a snow cross event
back in 2008 , It was 50deg F , water running down the ski slopes , 1 foot of slush
and I still smile thinking about it.
I have seen people put next larger tire size on vehicles and kill their
mileage . Most engines have a happy RPM and expect as mentioned that
Yamaha clutching was aimed at performance but considered mileage
when not pinned to the bar as well.
If it is worse than an other identical sled , maybe check your clutches
for wear or grime on the secondary ..
Ron