i know its a old topic

mikeoutlaw · #1 (**permalink**) 12-16-2010, 01:52 PM

i have an 08 525 outlaw bought left over. took it in for backfiring recall (cut a little off header) still back fires! drives me crazie. i think for x mas i have a full exhaust (dont know brand) with this and rejetting and air cleaner. will this finally stop people calling it a pop poping polaris? thanks new here and love it!

**Bruce!** · #2 (**permalink**) 12-16-2010, 02:08 PM

Welcome to the board!

2much$inpred · #3 (**permalink**) 12-16-2010, 03:43 PM

when is the pop happening. while reving it really high or shifting into a gear when really laying into the throttle. let me know ill see if i can help. and also have u played with anything. anything at all let me know this too just so i can keep that in mind

mikeoutlaw · #4 (**permalink**) 12-17-2010, 12:15 PM

i did go up on main jet a couple of sizes didnt help. i left the size up from stock (i know they are lean) I think the exhaust is junk my dad bought a dsx 450 exhaust and it came with high temp silicon so i put some around the head pipe and it cured it for a short time. it is low hrs so the valves should be ok. i am a banshee guy first perf 4 stroke wanted to be different from the yamahas and honda guys. this is why i am going aftermarket exhaust (but dont want it to loud)i think the exhaust is bad again low hrs changed oil after 2 tanks it looks better than when i bought it . thank you oh yea it only happens after you let off the throttle under hard exell

2much$inpred · #5 (**permalink**) 12-18-2010, 09:29 AM

i really dont think there is a problem with the poping. mine does it too. if ur doing it laying into the gas then hey welcome to a four stroke. my first one that was heavily worked at one time shooting fire out my exhaust when i was shifting. theres something just about them that makes it do it. there must be excess somewhere that builds up for that pop. y putting on an exhaust i think the pop is going to be more noticeable

**blueline15** · #6 (**permalink**) 12-18-2010, 09:37 AM

I would also like to add that you may want to get the jetting chart for you dealer and confirm that your carb has the proper settings for you elevation and ambient temperature range. Both will play a factor in this. 3 common settings that may need to be changed are main jet, pilot jet, and needle clip position depending on what the chart says

mikeoutlaw · #7 (**permalink**) 12-18-2010, 05:21 PM

i have seen guys say they like it (LOSERS) i have a boring 4 stroke (YARD HELPER) no pop. i put stuff arund head to exhaust worked for a while! (plus wanted the farmal M pipe gone) thats why! talkalled to a ktm dealer (backed up) said they are lean But it has a dif exahust (Never heard of recall)
thanks for your help but it should not backfire! my friends 450 honda (NO) my fathers canam 450 (NO) my brothers raptor 700 (no) my uncles 450 yamaha (no)and the others i ride with But thanks!

**blueline15** · #8 (**permalink**) 12-18-2010, 05:32 PM

My guess is its stock jetting with a non-stock exhaust? If so there is your problem

2much$inpred · #9 (**permalink**) 12-19-2010, 02:57 PM

so were saying its a leak in the exhaust at the head. i thought of it once but went to thinking it was in the carb tunning if anything. this is good im learing a little on this one. what did they do to fix it. new exhaust rings to seal and shave the head

terrasmak · #10 (**permalink**) 12-19-2010, 08:57 PM

Just get a JD jet kit and go from there.