2017 KTM 350SXF hard starting

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10/28/2018 11:00 AM

Hello everyone. I got a 2017 KTM 350SXF and am having trouble starting it. It fires and fires for a while then will eventually start. Even after a while of running I need to use the cold start to start it. It will start right away usually if I use the cold start but if I don’t it won’t start. Checked valves and they are all in spec. Would it be inline fuel filter? Fuel injector? Any input would be great, thanks!

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10/28/2018 1:42 PM

To add to your list... is your air filter clean and or not over oiled? Just because your valves are in spec doesnt mean theyre good. What did the leak down test say?

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10/28/2018 5:04 PM

Fuel pump filter, fuel pump, injector dirty, TPS setting and inline fuel filter are all possibilities.
I would also suggest checking the condition of the battery. Do a load test, as if the battery is just down in voltage a bit it will be hard to start and may even turn over slow.

Paw Paw

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10/28/2018 5:15 PM

The oem batteries on the 17's are know to be terrible (was updated for 18), so if the bike runs fine once it's running I'd start there.

I put a WPS battery in mine, and it solved the hard starting issue.

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10/28/2018 7:38 PM

How many hours?

I’d check in this order:
-clean/correctly oiled air filter
-Change In Line fuel filter
-WPS battery
-ECU remap From Twisted Development
-Check Fuel pump for kinked line?
-Leak down test

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10/29/2018 10:05 AM
Edited Date/Time: 10/29/2018 10:06 AM

jmf535 wrote:

The oem batteries on the 17's are know to be terrible (was updated for 18), so if the bike runs fine once it's running I'd start there.

I put a WPS battery in mine, and it solved the hard starting issue.

This.
Mine started fine one day then went to shit the next. Wouldn’t charge or anything. Went with the wps and no issues.

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10/29/2018 12:18 PM

jmf535 wrote:

The oem batteries on the 17's are know to be terrible (was updated for 18), so if the bike runs fine once it's running I'd start there.

I put a WPS battery in mine, and it solved the hard starting issue.

Taylor415 wrote:

This.
Mine started fine one day then went to shit the next. Wouldn’t charge or anything. Went with the wps and no issues.

Which WPS model? The featherweight ones from Amazon?

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10/29/2018 1:21 PM

Looks like FirePower is the name of the brand now. Seems like the same battery, different branding.
https://www.btosports.com/p/fire-power-featherweight-lithium-batteries

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10/30/2018 8:35 AM

Thanks for all the help! I’ll start small with filters. Battery seems to be good. Lots of power and went to put it on the charger and it says it’s full of power

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10/30/2018 8:41 AM

CarlinoJoeVideo wrote:

Looks like FirePower is the name of the brand now. Seems like the same battery, different branding.
https://www.btosports.com/p/fire-power-featherweight-lithium-batteries

The ones in the link you provided only have about 120-150CCA's . Isn't that quite low? My current Antigravity 8 cell model has 240 CCA and it still takes 2-3 tries plus a crack of the throttle for my bike to fire up.

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10/30/2018 8:58 AM

CarlinoJoeVideo wrote:

Looks like FirePower is the name of the brand now. Seems like the same battery, different branding.
https://www.btosports.com/p/fire-power-featherweight-lithium-batteries

Kanewel433 wrote:

The ones in the link you provided only have about 120-150CCA's . Isn't that quite low? My current Antigravity 8 cell model has 240 CCA and it still takes 2-3 tries plus a crack of the throttle for my bike to fire up.

I’m not sure, I used that for a few years and no problems, never died.

I also have updated maps on my bikes that make it start super easy.

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10/30/2018 9:57 AM

CarlinoJoeVideo wrote:

Looks like FirePower is the name of the brand now. Seems like the same battery, different branding.
https://www.btosports.com/p/fire-power-featherweight-lithium-batteries

Kanewel433 wrote:

The ones in the link you provided only have about 120-150CCA's . Isn't that quite low? My current Antigravity 8 cell model has 240 CCA and it still takes 2-3 tries plus a crack of the throttle for my bike to fire up.

The Antigravity 8 cell is what I used on a 750cc triple-cylinder street bike...it's overkill for a dirt bike. 120-150CCA's is plenty.

I've been using the WPS/FirePower battery for a year now, and it's always started on the first try and I've never had to use the cold start button. I suspect something is off with your bike, if it's still that difficult to start with that battery...a remap would probably do wonders for you.

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10/30/2018 11:46 AM

CarlinoJoeVideo wrote:

Looks like FirePower is the name of the brand now. Seems like the same battery, different branding.
https://www.btosports.com/p/fire-power-featherweight-lithium-batteries

Kanewel433 wrote:

The ones in the link you provided only have about 120-150CCA's . Isn't that quite low? My current Antigravity 8 cell model has 240 CCA and it still takes 2-3 tries plus a crack of the throttle for my bike to fire up.

jmf535 wrote:

The Antigravity 8 cell is what I used on a 750cc triple-cylinder street bike...it's overkill for a dirt bike. 120-150CCA's is plenty.

I've been using the WPS/FirePower battery for a year now, and it's always started on the first try and I've never had to use the cold start button. I suspect something is off with your bike, if it's still that difficult to start with that battery...a remap would probably do wonders for you.

This is totally unfamiliar territory for me. Does that mean new ECU? Or is there a way to download a new map to the existing ECU?

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10/30/2018 12:12 PM

Kanewel433 wrote:

This is totally unfamiliar territory for me. Does that mean new ECU? Or is there a way to download a new map to the existing ECU?

No need to purchase a new ECU...you can simply send your current one out, and they will upload a new map.

Personally, I had Tokyo Mods do mine.

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10/30/2018 9:22 PM

jmf535 wrote:

The Antigravity 8 cell is what I used on a 750cc triple-cylinder street bike...it's overkill for a dirt bike. 120-150CCA's is plenty.

I've been using the WPS/FirePower battery for a year now, and it's always started on the first try and I've never had to use the cold start button. I suspect something is off with your bike, if it's still that difficult to start with that battery...a remap would probably do wonders for you.

Kanewel433 wrote:

This is totally unfamiliar territory for me. Does that mean new ECU? Or is there a way to download a new map to the existing ECU?

jmf535 wrote:

No need to purchase a new ECU...you can simply send your current one out, and they will upload a new map.

Personally, I had Tokyo Mods do mine.

Yeah you can send out the Ecu that’s under your seat to a company like Tokyo Mods or Twisted Development
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