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Discussion Starter · #1 ·
went to order my 154 summit x 2.5 and there is a option of low or high elevation.

does anyone know the specfics between low and high elevation model summit 154 2.5?

all i was able to find out so far was low has electric start.

main concern is if the low comes with the clickers, is there a fuel map difference and what the gearing and clutching changes are?
 

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In the past the only difference was the clutch set up.high elevation requires most times different Rams and less clutch weight. Sleds and everything else loose 3% HP for every 1000 feet u climb so the motor does not need as much clutch weight to maintain 7900 RPM.

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Not sure anyone knows yet with the pdrive. But older xms and xps was obviously lighter weights, sometimes spring changes. If you order just tell your dealer you want both.
 

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Best to wait a few more weeks until dealerships get more information. On the XP and XMs ramps and weights are different but Also the gearing on summits and freerides. I always order high because you get 441 ramps and put a 21 or 23T on top gear. Great set up for me on and off trail at low elevation.
 

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Im at 550~1700 feet

I ordered the 154 x 3" w/high elevation & elect start

Right now the dealer could tell me nothing about the difference in the two calibrations. Regardless, I will buy the low elevation kit after the sled arrives.

I suspect im going to be making my own cam arms anyway to try and make an all-elevation kit. I would like to make one to just add or subtract composite parts (weight) from "one" profile of cam arm for different elevations.
 

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Im at 550~1700 feet

I ordered the 154 x 3" w/high elevation & elect start

Right now the dealer could tell me nothing about the difference in the two calibrations. Regardless, I will buy the low elevation kit after the sled arrives.

I suspect im going to be making my own cam arms anyway to try and make an all-elevation kit. I would like to make one to just add or subtract composite parts (weight) from "one" profile of cam arm for different elevations.
Curious why you would get a high elevation sled when you are just above sea level? Why not order with low elevation from the get go?
 

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i was wondering which way to go as well , i typically will not be above 1000ft .

A little off topic but when i build the summit on the website is shows electric start and pull start included . I have one price back so far and dealer says es is optional . is it just a mistake on the website ?
 

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Metalhead
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Curious why you would get a high elevation sled when you are just above sea level? Why not order with low elevation from the get go?
i want to test the high elevation kit at low elevation and see what kind of range of adaptability it has.
 

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Discussion Starter · #12 ·
I was told the THMB(high elv) and THMC(low level) models are the same price,, both with electric start and black 2.5 summit x

The low elevation sleds all have electric start, high elevation is a option

The high elevation clutching with low elevation pin weight works a lot better off trail then the low elevation, seems like low elevation is set for trial riding and is hard on belts when off trail
 
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