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post #1 of 31 (permalink) Old 11-08-2017, 10:04 AM Thread Starter
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sunk 420

i just bought a 2014 420 4x4 that is sunk, only has 500 miles on it and got a steal of a deal on it. I bought it from someone that i know and when he sunk it he brought it straight to my house and i drained the oil and pulled the spark plug and got the water out of the top end. Put new oil in it and went to start it to flush the motor and it wouldnt start i am pretty sure its a fueling issue because its getting air and spark. Ive fixed carb bikes that got sunk but never efi so this is a new area for me. im planning on changing the injector and fuel pump and draining the gas and cleaning the tank out but what else do yall think i should do, not to familiar with efi so looking for advice, thanks.
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post #2 of 31 (permalink) Old 11-08-2017, 10:25 AM
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Water in fuel, drain tank and flush lines. Will take a few cycles of the key to pump water out of injector.
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post #3 of 31 (permalink) Old 11-08-2017, 10:26 AM
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unplug all connectors and spray with wd 40 and apply dielectric grease. it should fire off with a little starting fluid in the air box after a good cleaning if not damaged
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post #4 of 31 (permalink) Old 11-08-2017, 10:36 AM Thread Starter
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the plugs were all dielectric greased before he went riding, pretty sure the snorkle failed and thats what killed the bike but i am definitely flush the gas tank and worse case change injectors and fuel pump
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post #5 of 31 (permalink) Old 11-08-2017, 10:59 AM
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I wouldn't replace anything just yet. Flush fuel system, including draining the fuel pump bowl, and unbolt the injector from the throttle body, cycle the key on and off a few times, pointing it away from you. It will spray some crappy water/fuel out each time you cycle the key on. Fill tank with fresh gas, and then reinstall the injector and try it.
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post #6 of 31 (permalink) Old 11-08-2017, 11:03 AM Thread Starter
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i did forget to mention that i did pull the injector out yesterday and turned the key on and off multiple times and all the injector did was spin and no gas came out, so im not sure about injectors because ive never had problems with my efi foreman yet so this is a learning curve. are the injectors supposed to spin, all i know is that the fuel pump is supposed to push gas to the injector and then spray the gas into the throttle body
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post #7 of 31 (permalink) Old 11-08-2017, 11:23 AM
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Quote:
Originally Posted by redhonda300 View Post
i did forget to mention that i did pull the injector out yesterday and turned the key on and off multiple times and all the injector did was spin and no gas came out, so im not sure about injectors because ive never had problems with my efi foreman yet so this is a learning curve. are the injectors supposed to spin, all i know is that the fuel pump is supposed to push gas to the injector and then spray the gas into the throttle body
the fuel injection on that atv does not spin, its operated from fuel pump pressure, no moving parts on the fuel injector.

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post #8 of 31 (permalink) Old 11-08-2017, 12:08 PM
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Personal opinion here but I wouldn’t be starting it up for the first flush, I’d definitely have filled the motor with diesel and kicked it over a few times. I’d also put it in gear and push it around or drag it a little with another ATV.
Any grit/dirt will eat those bearings up inside faster than you can imagine. Flush, flush and flush again before starting.

Have you checked fuel pressure? Is the fuel pump working, can you feel/hear it?

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post #9 of 31 (permalink) Old 11-08-2017, 01:04 PM Thread Starter
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I am gonna go home and check all that and shake it around and see what happens. I hear the fuel pump engaging but doesnt sound quite as loud as i think it should.
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post #10 of 31 (permalink) Old 11-08-2017, 01:40 PM
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Quote:
Originally Posted by redhonda300 View Post
i did forget to mention that i did pull the injector out yesterday and turned the key on and off multiple times and all the injector did was spin and no gas came out, so im not sure about injectors because ive never had problems with my efi foreman yet so this is a learning curve. are the injectors supposed to spin, all i know is that the fuel pump is supposed to push gas to the injector and then spray the gas into the throttle body

That's not the injector. That's the IACV (Idle air control valve). It spins when you turn the key off. Basically a choke for the EFI machines.

Follow the fuel line to where it goes into the throttle body. That's the injector. IIRC there are two 8MM bolts holding it in place.
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