not starting after jumping and rippin it - HCS Snowmobile Forums

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Old 03-09-2020, 07:11 AM   #1 (permalink)
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Current Sled(s): 15 Pro X SB
Previous Sled(s): 14 SBA 800, 08 IQ600R, 03 xc600sp mod, 98 xc 600, 92 xcr 440
Location: otseghoe, mn
Favorite Riding Area: WYOMING mtns/ditches/off trail
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Default not starting after jumping and rippin it

Usually I would just start wrenching and leave the internet in the dust and try to troubleshoot the issue myself. But at this time Iím in the process of moving to a new house and wont be able to wrench on the sled for a little while. So of to the forum to get some input.
Sled issue:
So I was in WY this last week and ended up having to use my dads backup sled.
I was having a little jump session (like 3-4 hits). Holdiní er pretty wide ya know.
Anyway when I was pulling back onto the trail it was kind of sputtering like it wasnít jetted properly. Keep in mind my sled is a 15 SB Pro X 800.
Went to start the sled and as everyone rides away and nothing. I fiddled around with everything and checked this and that but nothing obvious. I changed to the spare plugs I had which were black and used. The plugs I removed were very white on the mag side and nice dark brown on the pto.
My brain is telling me mag side crank seal, but would that create a no spark issue? As the sled failed to start multiple times we checked for spark and there was not spark. Btw the sled was not stalling at idle or anything just tried reverse the one time and shut it off the other time to test if it was going to restart or not.
When the sled would restart after a while of looking at it the sled would run pretty good at WOT but mid range was questionable.
Was reading online about issue that would create a no start that if the af ratio is off at startup it wonít fire.
Have never done crank seals on this engine. Did top end last summer with rk tek pistons and itís been running good since then.
Was thinking about the capacitors above the clutch coverÖ.
Another thing was maybe the stator or timing sensors in the mag housing?

Did a compression check with a very questionable tester when on the mountain @ 8300í and that revealed 70psi on each cylinder. This was concerning but the fact that they are similar is good to me. So I havenít had time yet to grab my gauge and check at home here in mn now that im back.
How much compression loss should one see at elevation?

Summary: While riding in Wyoming hitting a jump I get back onto the trail and the sled is not running the best. Shut it down, and when I tried to re-fire to head out it wouldnít start.
Mag side plug was white and pto brown.
Couldnít find anything obvious.


My main suspect ideas:
1. Mag side crank seal
2. Low compression
3. Stator or timing sensors in flywheel housing
4. Capacitors on clutch cover

Any input would be great! Itís the end of the season now so plenty of time to wrench on it during the off season so figured I would get some input!
Thanks
Kent
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Old 03-09-2020, 07:48 AM   #2 (permalink)
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Check all electrical connections, throttle lever free play, relays, and definitely check compression with good gauge. Check exhaust valves and cable. Pull recoil and visually inspect seal for excess leakage. The get into testing components.
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Old 03-09-2020, 08:20 AM   #3 (permalink)
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Current Sled(s): 15 Pro X SB
Previous Sled(s): 14 SBA 800, 08 IQ600R, 03 xc600sp mod, 98 xc 600, 92 xcr 440
Location: otseghoe, mn
Favorite Riding Area: WYOMING mtns/ditches/off trail
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lever was replaced when i upgraded the bars. adjusted free play then.
exh valve assembly and cable replaced recently.
two relays on the pto shock tower have been replaced. am i missing relays elsewhere?

was reading how the recoil housing contains two timing sensors as well.

if the compression test checks out i might just bring it to my dealer.
if i can for sure say its a crank seal i could pull the engine myself.
but the troubleshooting of each component throws me off sometimes.
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Old 03-09-2020, 12:43 PM   #4 (permalink)
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Current Sled(s): 2015 Polaris 800 Switchback, 2016 800 Rush
Previous Sled(s): 2002 Polaris EXCR800, 2003 EdgeX 800, 1999 Polaris XCR800
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I just bought my 2015 800 for a no start too (8500 miles). Only difference was mine was getting spark. I checked the capacitors, stator, throttle safety switch and kill switch. The throttle safety switch has 2 resistance checks of throttle and in throttle, this would cause the computer to kill the spark. That was not the case on mine.
They adjusted the throttle butterfly and the throttle position sensor.
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Old 03-09-2020, 01:24 PM   #5 (permalink)
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Quote:
Originally Posted by crazyman View Post
lever was replaced when i upgraded the bars. adjusted free play then.
exh valve assembly and cable replaced recently.
two relays on the pto shock tower have been replaced. am i missing relays elsewhere?

was reading how the recoil housing contains two timing sensors as well.

if the compression test checks out i might just bring it to my dealer.
if i can for sure say its a crank seal i could pull the engine myself.
but the troubleshooting of each component throws me off sometimes.

Have you tried unplugging and plugging in the hood connector? The connection at ecu? E-start?
The pins in the connectors can come loose or push out as you push plugs back together so check each wire to see if they are loose or pushed out of connector.

Last edited by Sledtuner360; 03-09-2020 at 01:28 PM.
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Old 03-09-2020, 01:32 PM   #6 (permalink)
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Current Sled(s): 15 Pro X SB
Previous Sled(s): 14 SBA 800, 08 IQ600R, 03 xc600sp mod, 98 xc 600, 92 xcr 440
Location: otseghoe, mn
Favorite Riding Area: WYOMING mtns/ditches/off trail
Riding Since: 1
Default

Quote:
Originally Posted by Sledtuner360 View Post
Quote:
Originally Posted by crazyman View Post
lever was replaced when i upgraded the bars. adjusted free play then.
exh valve assembly and cable replaced recently.
two relays on the pto shock tower have been replaced. am i missing relays elsewhere?

was reading how the recoil housing contains two timing sensors as well.

if the compression test checks out i might just bring it to my dealer.
if i can for sure say its a crank seal i could pull the engine myself.
but the troubleshooting of each component throws me off sometimes.

Have you tried unplugging and plugging in the hood connector? The connection at ecu? E-start?
The pins in the connectors can come loose or push out as you push plugs back together so check each wire to see if they are loose or pushed out of connector.
Sled doesn’t care if the hood is on.
No electric start.
Haven’t and won’t have time to work on it for a couple weeks.
Just looking for input once I get around to it.
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Old 03-09-2020, 07:29 PM   #7 (permalink)
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I just replaced my relays I think there was 1 in bag above clutches
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Old 03-10-2020, 06:07 AM   #8 (permalink)
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Current Sled(s): 15 Pro X SB
Previous Sled(s): 14 SBA 800, 08 IQ600R, 03 xc600sp mod, 98 xc 600, 92 xcr 440
Location: otseghoe, mn
Favorite Riding Area: WYOMING mtns/ditches/off trail
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Quote:
Originally Posted by jeffs polaris View Post
I just replaced my relays I think there was 1 in bag above clutches
there are two right on top of the shock tower on the pto side. but i havent looked in that bag above the regulator. will rememebr to check that too!
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Old 03-13-2020, 01:01 PM   #9 (permalink)
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Current Sled(s): 15 Pro X SB
Previous Sled(s): 14 SBA 800, 08 IQ600R, 03 xc600sp mod, 98 xc 600, 92 xcr 440
Location: otseghoe, mn
Favorite Riding Area: WYOMING mtns/ditches/off trail
Riding Since: 1
Default

At my dads today wasting time. Of course the compression tester is packed in my shit to move to my new house. Oh and the weights to change it back over to low elevation. So all I had to do was poke around the sled and such. But the damn thing started when I tried. So maybe it will be easy to load and move to my new house. But will be tearing it all down to inspect everything this spring.
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