I just ordered the heavy below 4500 41-840kit. What's the difference between the 41-740 and the 41-840 kits? Can I get the second set of springs later? will it also come with a setup sheet? Are these kits instock?Glad to help out Shawn, the clutch kit we sell for the 2015 900 models without factory EBS, sea level to 4500' (SLP#41-740) includes adjustable weights to give you the best performance for different elevations. This is going to be key for you with the broad range of elevations you play at.I have a heavy 2015 900/4 and we ride any where sea leval to 13,000 in CO. What clutch should I buy? I also have the bully dog tuner on it.
For each 1000' that you go up in elevation, your RZR will loose approximately 3% of the horsepower it's engine is capable of at sea level. So the 75 horsepower you make at sea level is more like 50 at 11000'. (This is with a naturally aspirated engine with no electronic limiting)
At elevations above 4500' the drop in horsepower requires a different clutch calibration on the weights and the drive spring as well for this model. (Only the spring would need to be purchased as the weights have enough adjustability to handle the required calibration changes).
When you order the clutch kit, just ask about the additional spring and tuning specs so the salesman can send them along with.