2017 KTM SXF350 HELP!!!!!

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12/28/2018 9:35 AM

Here's what happened:

The bike has 43 hours on it. A few months ago the bike would not start and turned out the connector for the electric start button got water in it and the connector corroded. Replaced the starter relay and wired the main wiring harness directly to the starter button. Problem solved.

This past week while riding, the bike just randomly shut off in a corner and would not restart. We tried a new battery and it started, then put it in gear and it just shut off again and would not start back up. You can hear the fuel pump turn on, but nothing after that. I am not sure where to even start.

Someone told me it could be the fuel filter that is clogged, so I will start with that tonight.

Any other suggestions? Not very strong when it comes to electrical

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12/28/2018 10:08 AM

Does it start when its in neutral and then dies in gear - every time? Or does the starter not even turn over?

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12/28/2018 10:18 AM

first I would check to make sure you’re getting a nice strong spark... if you are then I would lead towards checking the fuel delivery system.. possibly a clogged filter, also may be a weak fuel pump or plugged/ dirty injector... my bet is on the pump I have seen several KTMs with no start issue caused by a weak pump... check inline pressure that will give you a good indication of the condition of the fuel system... if the pressure checks correctly check the injector spray pattern have also seen the o-rings on the fuel rail deteriorate and plug injectors...

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12/28/2018 10:31 AM

kb228 wrote:

Does it start when its in neutral and then dies in gear - every time? Or does the starter not even turn over?

This is a good question does it still turn over? If not disregard my advice your problem is else where...

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12/28/2018 11:42 AM

kb228 wrote:

Does it start when its in neutral and then dies in gear - every time? Or does the starter not even turn over?

It did the last time it started, now it wont even turn over. You just hear the starter relay clicking and thats it. Wont fire up.

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12/28/2018 1:14 PM

Try another battery

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12/28/2018 1:44 PM

kb228 wrote:

Try another battery

That is the plan. Thanks for the help so far. Will update later.

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12/29/2018 9:19 AM

Tried a new battery and replaced the in line fuel filter. Noticed fuel pump did not turn on when warming up the battery, she started but as soon as you give it gas it shuts off. Trying a different tank today from a buddies bike and I think it may be the fuel pump that is shot. Any suggestions?

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12/29/2018 9:51 AM

If the pump isnt turning on try replacing the small relay in the airbox, not the larger starter relay.

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12/29/2018 11:04 AM

Swapped tanks and bike starts and runs fine. Ordering a new fuel pump today

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12/29/2018 2:24 PM
Edited Date/Time: 12/29/2018 2:25 PM

mikejones202 wrote:

Swapped tanks and bike starts and runs fine. Ordering a new fuel pump today

Hold it, there is a big chance it is not the actual fuel pump, but one of the tubes of the fuel filter in the tank that is leaking (so it loses pressure when you hit the throttle). Quiet much cheaper to replace those with 3rd part then the complete fuel pump package.

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1/3/2019 9:47 AM

May sound stupid. But check the 10 amp fuses that are under the seat next to the battery. Mine wouldn't start after something similar and what do you know it was a fuse. Wish I would've checked before panic set in.

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1/3/2019 4:39 PM

mikejones202 wrote:

Swapped tanks and bike starts and runs fine. Ordering a new fuel pump today

Pull the fuel pump out and ensure the fuel line isn't kinked. This is a known problem.
If you do have to change the pump, search around and you can find the individual pump for a fraction of the price of the entire assembly.

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1/4/2019 9:55 AM

I had a kink in my 16 250f which I believe is the root cause of why the pumps take a shit. B4 mine died I replaced both inside fuel lines, eliminated inside filter and little outside filter with an external filter. Zero problems so far and only cost me about $70 to fix

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