Sled Running Bad at Low Elevation

T

TPDP32

Free Member

Oct 25, 2008

76

3

8

Kootenay Powderville

• Feb 21, 2019

• #1

I have a 2016 M800, sled has run flawlessly for the last two years, but all of a sudden it has started running really bad below 1000 meters (3000ft) Sled runs perfect above that elevation, but lower down on the trail it won't hold revs over 6800 rpm. The sled has a new crate motor, new primary, new ECU, new reeds, powervalves are clean and adjusted. No codes come up. Any ideas? Sled was having the same problem before the new motor, clutch, reeds and ECU.

 

Cat00

Well-known member

Lifetime Membership

Nov 26, 2007

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85

28

• Feb 21, 2019

• #2

Do you have a can on the sled I had problems with an m7 I had running a can with not enough back pressure

 

T

TPDP32

Free Member

Oct 25, 2008

76

3

8

Kootenay Powderville

• Feb 21, 2019

• #3

I have a can but ran the stock one after the new motor was put in and the stock can vs aftermarket make no difference in the problem

 

S

Skywest

Free Member

Feb 19, 2017

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8

• Feb 25, 2019

• #4

What do you mean by it won’t hold revs? Like if you hold the throttle to bar it won’t go past 6800?

 

A

Allseasons

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Premium Member

Feb 2, 2014

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43

Rocky Mtn House AB

• Feb 26, 2019

• #5

Too rich.
Your running premium 91 fuel? Because that could be detonation happening.
The elevation tube isn’t plugged?

Can’t see it being clutching. Gotta be fuel or air or the power valve actuator not opening. That rpm is right when they should open. When you start up the sled, does the actuator open and close 3 times? It should if it’s functioning correctly

I don’t have experience with riding under 3000 so I’m grasping for you

 

Last edited: Feb 26, 2019

T

TPDP32

Free Member

Oct 25, 2008

76

3

8

Kootenay Powderville

• Mar 8, 2019

• #6

Running 91 . Sled just sputters out when you try to get over 6800 rpm . Only down low elevation though . As soon as we get above 3000ft the sled runs flawlessly. Come back into the valley and it hits a wall again .

 

O

Old & slow

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Feb 18, 2017

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Alberta

• Mar 8, 2019

• #7

TPDP32 said:

Running 91 . Sled just sputters out when you try to get over 6800 rpm . Only down low elevation though . As soon as we get above 3000ft the sled runs flawlessly. Come back into the valley and it hits a wall again .

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That's a strange one, did you ever check your fuel pressure? Make sure the plastic tube coming off the ecm is not kinked or blocked. That RPM is around when the power valves open another thing to check.