RMK DET issue

kurtis.g

Member
Joined
Jan 23, 2011
Messages
13
Reaction score
0
Location
edmonton
Had a MNTK fix kit installed and a aftermarket head. Since my sled runs good, But at lower elevations like the trail ride up to the cabins in McBride or Valemount my sled throws a det code when I open the throttle up a bit. once I'm up in the alpine I can go WOT with no issues. I'm wondering if anyone else has had this issue with a fix kit? one theory I have is with the fix kit theres a little more power and im over revving and it throws a DET, another is maybe my compression is too high and im actually getting detonation.
 

TDR

Active VIP Member
Joined
Dec 19, 2012
Messages
927
Reaction score
1,393
Location
Edmonton
I’ve been through this before. Watch your revs down low cause it’s easy to hit det on the trail with the extra hp. My sled would rev enough to hit the rev limiter, det and shutdown. The high compression head and fix kit provide more hp.
 

kurtis.g

Member
Joined
Jan 23, 2011
Messages
13
Reaction score
0
Location
edmonton
yeah that's what I do, Im wondering if i can change up my clutching I hate having to limp up the trail
 

TDR

Active VIP Member
Joined
Dec 19, 2012
Messages
927
Reaction score
1,393
Location
Edmonton
Then you might suffer at elevation. The trail up is only the conduit to the fun zone!!
 

ABMax24

Active VIP Member
Joined
Sep 10, 2013
Messages
4,573
Reaction score
13,162
Location
Grande Prairie, Alberta, Canada
Your aftermarket head bumped compression increasing the chance of detonation. If you want to run WOT at lower elevation you either need to drop compression, retard timing (don't recommend this as it negates the power created by the higher compression head), or run higher octane fuel. Adding 5 liters of race fuel or av gas per tank should be enough to keep DET at bay, and don't even be tempted by the 94 octane pump gas as it will have significant amounts of ethanol added to bump octane ratings, and ethanol poses a whole other set of issues for 2-strokes.
 

kovs

Active VIP Member
Joined
Apr 12, 2009
Messages
800
Reaction score
1,040
Location
Rosetown, sask
Have to agree it’s fuel couple gal of av or race should solve issue
Used to run a stage kit on pro and with fuel controller and nitrous. It would just keep pulling rpm with good fuel. Maybe fuel map bumped up numbers to 9200 rpm helped?
On spray here in sask racing it would turn 87-8800rpm. Don’t think they are rpm limited like Doo @ 8600
 

Chrisco

Active VIP Member
Joined
Mar 28, 2007
Messages
2,478
Reaction score
6,038
Location
Stony Plain
ABmax24 Is right on the money, bump up the octane a bit and good to go.
 
Top Bottom