Forum Main Tech Help/Race Shop 2019 KTM 450 SXF popping on decel

2019 KTM 450 SXF popping on decel

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atrdrvr7

Vital MX member atrdrvr7 37183 atrdrvr7 https://p.vitalmx.com/photos/users/37183/avatar/c50_KC_RideOn_Web3_1481741642.jpg?1481740764 https://www.vitalmx.com/community/atrdrvr7,37183/all 01/15/13 74 206 44 3

Posts: 280

Joined: 1/15/2013

Location: Houston, TX USA

7/21/2018 8:35 AM
Edited Date/Time: 7/21/2018 8:36 AM

Just picked up a fresh one a few days ago. Took it out for a ride yesterday. Went through the normal break in procedures. The bike was popping on decel the whole day. Pretty annoying to say the least.

Checked the exhaust over for leaks and found none. Also noticed the spark arrestor screen in the silencer has a hole blown through it after riding. I have the TPS tool that I used on my 16'. Is the setting the same for adjustment .60-.64 for the sweet spot? Any other ideas? Thanks

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kb228

Vital MX member kb228 61852 kb228 https://p.vitalmx.com/photos/users/61852/avatar/c50_48AD01BA_8BE7_43D5_B767_B4A5D12AFA64_1538263085.jpg?1538262140 https://www.vitalmx.com/community/kb228,61852/all 01/31/18 73 5433 1

Posts: 5510

Joined: 1/31/2018

Location: Mansfield, OH USA

7/21/2018 8:43 AM

If the bike has a new ecu and mapping the voltage is likely different. Look up a 19 service manual and see. Im putting my bets on the voltage being different and youre still off. I doubt you have an exhaust leak on a new bike.

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blaze 57

Vital MX member blaze 57 63102 blaze 57 https://p.vitalmx.com/photos/users/63102/avatar/c50_29027215_417282395400279_4545087439008085185_n_1523746770.jpg?1523746267 https://www.vitalmx.com/community/blaze-57,63102/all 04/11/18 12 207 1

Posts: 219

Joined: 4/11/2018

Location: Spokane, WA USA

7/21/2018 4:29 PM

I remember someone else reported popping on their new Factory Editions 450's when they came out last Spring. My TPS on my new 450 FE was only .49 when I checked it. Bumped it to .60 but I never had any popping to begin with. I ended up sending my ECU to Tokyo Mods for a re-flash along with the FMF full exhaust. Big differance.

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atrdrvr7

Vital MX member atrdrvr7 37183 atrdrvr7 https://p.vitalmx.com/photos/users/37183/avatar/c50_KC_RideOn_Web3_1481741642.jpg?1481740764 https://www.vitalmx.com/community/atrdrvr7,37183/all 01/15/13 74 206 44 3

Posts: 280

Joined: 1/15/2013

Location: Houston, TX USA

7/21/2018 5:22 PM

blaze 57 wrote:

I remember someone else reported popping on their new Factory Editions 450's when they came out last Spring. My TPS on my new 450 FE was only .49 when I checked it. Bumped it to .60 but I never had any popping to begin with. I ended up sending my ECU to Tokyo Mods for a re-flash along with the FMF full exhaust. Big differance.

Thanks. Im going to run it up to .60 and see if it fixes the popping.

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mx317

Vital MX member mx317 3927 mx317 https://p.vitalmx.com/photos/users/3927/avatar/c50_252_1593011107.jpg?1593010532 https://www.vitalmx.com/community/mx317,3927/all 04/01/08 5 https://www.vitalmx.com/community/mx317,3927/setup 71 3508 9

Posts: 3579

Joined: 4/1/2008

Location: TN, USA

7/21/2018 7:45 PM

Spark arrestor?

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Take it to the limit, one more time!

blaze 57

Vital MX member blaze 57 63102 blaze 57 https://p.vitalmx.com/photos/users/63102/avatar/c50_29027215_417282395400279_4545087439008085185_n_1523746770.jpg?1523746267 https://www.vitalmx.com/community/blaze-57,63102/all 04/11/18 12 207 1

Posts: 219

Joined: 4/11/2018

Location: Spokane, WA USA

7/21/2018 9:17 PM

mx317 wrote:

Spark arrestor?

I think they are just some kind of funky screen. The screen mesh may not be fine enough to pass forestry approval.

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sgrimmxdad

Vital MX member sgrimmxdad 39808 sgrimmxdad https://p.vitalmx.com/photos/users/39808/avatar/c50_tagupclose_1574854917.jpg?1574854894 https://www.vitalmx.com/community/sgrimmxdad,39808/all 07/23/13 3 70 1162 19 3

Posts: 1232

Joined: 7/23/2013

Location: Farmville, NC USA

7/22/2018 1:54 AM

We had to adjust our TPS to get rid of the popping on our 18 FE! Was at around 52 and we went to 60. Just added the FMF and went to 62!

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