2021 Yz250f backfires

Collin197
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Collin197
Edited Date/Time 10/28/2021 6:57pm
Hey guys,
I recently purchased a brand new 2021 yz250f and loaded both maps keefer recommended(free feeling/ more mid and top end) However on both maps I am getting a little bit of light backfire/popping on decel/coasting. I was told it could be a bad tank of gas so I am currently running v4 through it to try and clean it up some but I haven't had any luck. Bike has 3 hours on it and the only Mod is the twin air powerflow kit. any suggestions would be awesome!
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Rider 5280
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Denver Metro, CO US
Rider 5280 10/18/2021 1:13pm
10/18/2021 1:13pm
You likely got this right, but I did not initially, so I'll throw it out there just in case:
Check your maps to ensure you edited ALL of the numbers correctly, not just the settings in the table.


4
Collin197
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Rochester, NY US
Collin197 10/18/2021 1:45pm
10/18/2021 1:45pm
Rider 5280 wrote:
You likely got this right, but I did not initially, so I'll throw it out there just in case: Check your maps to ensure you edited...
You likely got this right, but I did not initially, so I'll throw it out there just in case:
Check your maps to ensure you edited ALL of the numbers correctly, not just the settings in the table.


Looks like that might be the issue! Never entered those values. I really appreciate it!!
2
kb228
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Mansfield, OH US
kb228 10/18/2021 7:08pm
10/18/2021 7:08pm Edited Date/Time 10/18/2021 7:08pm
Make sure your tps voltage is set to .62v at closed throttle. Theyre set lean from the factory
Collin197
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Collin197 10/19/2021 12:22pm
10/19/2021 12:22pm
kb228 wrote:
Make sure your tps voltage is set to .62v at closed throttle. Theyre set lean from the factory
How do you do that?

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BeachMX
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Anza, CA US
BeachMX 10/23/2021 9:13pm
10/23/2021 9:13pm
Rider 5280 wrote:
You likely got this right, but I did not initially, so I'll throw it out there just in case: Check your maps to ensure you edited...
You likely got this right, but I did not initially, so I'll throw it out there just in case:
Check your maps to ensure you edited ALL of the numbers correctly, not just the settings in the table.


This is GOLD!! I

I had just entered values on the table only on my 2020 yz250f... had no idea I could or should change the values on the outside! Been running like that for a year......

I re-loaded the maps this morning (TP & Keefer FF) with the side and bottom values updated, and.... huge difference!
Bike feels WAY better, and engine is running more efficient and screaming!

Thank you!!!!
1
Collin197
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Collin197 10/23/2021 11:51pm
10/23/2021 11:51pm
Update. Changing the values was the ticket. Bike was a night and day difference and no more backfires. Thanks guys!
1
PTshox
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Highland Village, TX US
PTshox 10/28/2021 6:57pm
10/28/2021 6:57pm
Rider 5280 wrote:
You likely got this right, but I did not initially, so I'll throw it out there just in case: Check your maps to ensure you edited...
You likely got this right, but I did not initially, so I'll throw it out there just in case:
Check your maps to ensure you edited ALL of the numbers correctly, not just the settings in the table.


BeachMX wrote:
This is GOLD!! I I had just entered values on the table only on my 2020 yz250f... had no idea I could or should change the...
This is GOLD!! I

I had just entered values on the table only on my 2020 yz250f... had no idea I could or should change the values on the outside! Been running like that for a year......

I re-loaded the maps this morning (TP & Keefer FF) with the side and bottom values updated, and.... huge difference!
Bike feels WAY better, and engine is running more efficient and screaming!

Thank you!!!!
Sigh... I did the same thing. Thanks for the info! Never entered those values out side the table. Jeez....

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