2010 sportsman 550 efi delayed start - Polaris ATV Forum
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post #1 of 10 (permalink) Old 07-17-2019, 05:43 AM Thread Starter
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2010 sportsman 550 efi delayed start

I recently picked up a 2010 sportsman 550 efi. When I got it the owner said sometimes, which on "cold" starts is always, that it takes a second to crank over. I haven't found any info on this problem.

Any feedback will be greatly appreciated.

Here is a "cold" start up. Less then 24 hour's sitting.


After it it's warm some times I get a stutter at start up


One other issue is the I have a small leak in the front diff. It doesn't appear to be any of the seals. The best I can tell is somewhere near the bottom of the diff towards the front. I only found this after seeing a small oil spot on the garage floor.


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post #2 of 10 (permalink) Old 07-17-2019, 05:52 AM
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Battery good?

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post #3 of 10 (permalink) Old 07-17-2019, 06:05 AM Thread Starter
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I haven't load tested it but it has 12.6v and is less than a year old


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post #4 of 10 (permalink) Old 07-18-2019, 06:33 AM
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Sometimes the fuel injector leaks fuel into the intake - the raw fuel pools in the cylinder and raises compression making it difficult for the engine to get over the first TDC stroke. Sometime holding the throttle wide open on the initial start lowers compression and eases the grunt. Or your battery may be slightly weak - put ameter across the battery terminals and see what the voltage drops to during cranking of the engine.
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post #5 of 10 (permalink) Old 07-20-2019, 04:42 AM Thread Starter
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Quote:
Originally Posted by latebird View Post
Sometimes the fuel injector leaks fuel into the intake - the raw fuel pools in the cylinder and raises compression making it difficult for the engine to get over the first TDC stroke. Sometime holding the throttle wide open on the initial start lowers compression and eases the grunt. Or your battery may be slightly weak - put ameter across the battery terminals and see what the voltage drops to during cranking of the engine.


Tested the battery

Off ~12.6v
Cranking ~ 6.4v
Idle ~ 14.4v

Im taking that the battery doesn't have the cranking power needed.




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post #6 of 10 (permalink) Old 07-20-2019, 04:45 AM Thread Starter
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Still having issues with the front diff leaking. I don't want to pull it but may have to. I unbolted it and jacked it up to try and get a look at the bottom of it but still couldn't get a good look at it. I still don't see any definite leaks. It's definitely coming from the bottom front somewhere.


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post #7 of 10 (permalink) Old 07-20-2019, 05:41 PM
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Quote:
Originally Posted by cutoutcummins View Post
Quote:
Originally Posted by latebird View Post
Sometimes the fuel injector leaks fuel into the intake - the raw fuel pools in the cylinder and raises compression making it difficult for the engine to get over the first TDC stroke. Sometime holding the throttle wide open on the initial start lowers compression and eases the grunt. Or your battery may be slightly weak - put ameter across the battery terminals and see what the voltage drops to during cranking of the engine.


Tested the battery

Off ~12.6v
Cranking ~ 6.4v
Idle ~ 14.4v

Im taking that the battery doesn't have the cranking power needed.


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My conclusion would be the battery has degraded and is not capable of providing full voltage when initially drawn upon, but test it once more with a jump from a known good battery (jump pack or any other good available battery) - if you jump with a car battery, do not leave the engine running like you would when jumping another car - just jump from battery to battery - if it starts normally with a jump, it's most likely the battery - if it still has a sluggish crank, it may be a dying starter motor. Check the current draw of the starter motor.
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post #8 of 10 (permalink) Old 07-21-2019, 02:05 AM
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If your battery is good, trying the suggested ideas, maybe the valves need adjusting. Some of the 550s had issues with valve adjustment.
How many miles/hours are on the machine?

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post #9 of 10 (permalink) Old 07-21-2019, 02:53 AM Thread Starter
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If your battery is good, trying the suggested ideas, maybe the valves need adjusting. Some of the 550s had issues with valve adjustment.

How many miles/hours are on the machine?


~2400 miles. Don't remember off hand how many hours. I'll check later


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post #10 of 10 (permalink) Old 08-01-2019, 04:17 PM Thread Starter
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Pulled the front diff out this past weekend and replace the inner seal for the 2 halves of the case and added a little rtv gasket maker around the outer flange for added comfort. Let sit for 36 hour's then filled the front diff, waited another 24 hour's to make sure it wasn't going to leak before reinstalling.

I haven't done anything with the battery yet. I can live with it for now. May toss a battery charger on it tomorrow just to see if it helps.


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