Loose Spark Plugs

[nowready05]

I am having a problem with my spark plugs becoming loose when out riding. Yes I properly tighten them down, maybe a little extra tight, but they always loosen up after a few miles. Motor is a SLP 903 and running 40% 110 race fuel and 60% premium 91. Using Amsoil Inerceptor oil premixed. Elevation is about 3000' to 8000'. The next step I was going to try is increase the race fuel, maybe 50/50 mix. Any help would be appreciated. Trying to get this motor dialed in properly.
Thanks for your input.

 

[retiredpop]

Don't know if this is the case with yours but I have heard detonation will cause this.

 

[jeepin270]

Detonation

 

[nowready05]

Detonation

If it is detonation, what do I need to do to correct it.
Thanks

 

[ullose272]

det, more race gas or richer jetting

 

[AdrenalineAddict]

It must not be severe deto or your motor would be junk by now, try mixing 50/50 this will raise your octane a wee bit. When you squeeze the throttle if it doesn't run/sound clean don't run it.

 

[Goinboardin]

More race fuel is the easiest answer. Make sure ignition timing is not too advanced, and that your not too lean, or running hot.

 

[jeepin270]

Do you have a knock sensor? What are you using for gauges? Fuel controller? How much compression or what size domes? I ain't no expert but the more information you provide the better chance you have of getting good tips.

Whoops, I jus noticed this was in the edge section. I browse all polaris as a whole

 

[nowready05]

det, more race gas or richer jetting

Took the sled into the shop today. Going with richer jetting and still going to go 50/50 fuel mix. Hope this helps.

 

[nowready05]

Do you have a knock sensor? What are you using for gauges? Fuel controller? How much compression or what size domes? I ain't no expert but the more information you provide the better chance you have of getting good tips.

Not sure if I have a knock sensor. Using Racepak Avenger 2. Not sure of dome size. Was going up a long hill on a groomed trail and reached a max egt reading of 1150 degrees. Did not see any reading higher than this all day. Sorry I could not provide more info to your questions.

 

[nowready05]

It must not be severe deto or your motor would be junk by now, try mixing 50/50 this will raise your octane a wee bit. When you squeeze the throttle if it doesn't run/sound clean don't run it.

I do not think it is severe. I did notice that at the lower elevations, like along the river bottom the motor does not run as well as when up in the higher elevations, seems not as crisp and responsive down low.