2016 XP900 starts runs 5 seconds and dies

Knowfish · 2025-09-29T15:50:02-0400

Just put in my 4 th new motor. It starts runs for like five seconds and dies
Put in new injectors, new airbox, new stator, new plugs, new throttle body.
New voltage regulator, new throttle position sensor, took all wiring.
Connections apart and checked
And the same thing happens starts then dies.
Taken it to the polaris, dealer three different times
And they can't find anything
I would appreciate any help

Knowfish · 2025-09-29T16:00:20-0400

Also put in new fuel pump.

Titos · 2025-09-29T17:25:28-0400

Holy smokes. The 4th motor in the same machine?
What happened to the other 3?

Did you replace the fuel pump? I don't see that on your list

Knowfish · 2025-09-29T17:58:30-0400

I bought a rebuilt one from rev 6 in Utah and it was bad
Send it back got another bad one then got another bad one pretty schooled now on on putting them in and out. I added that after but yes, new fuel pump, and it holds 55 pounds.

Titos · 2025-09-29T18:07:11-0400

Dur, I see the fuel pump comment now. haha I am blind.
Thanks for the tip to never buy from rev 6

Sorry, I'm not an engine expert and can't really help

larrygugliotta · 2025-09-29T21:41:06-0400

Is the tachometer working?

Knowfish · 2025-09-29T22:08:32-0400

Now it won't run at all, I turn it over and it trys to start then just coughs
Was watching the tachometer and it jumped to 800 .I assume that can't be right as it didn't run long enough.
Fuel pressure was 55 when I tried it

2016 XP900 starts runs 5 seconds and dies

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