Timing Gear Slipped - Poor Engine Performance - Polaris ATV Forum
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post #1 of 376 (permalink) Old 01-24-2014, 08:32 AM Thread Starter
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Timing Gear Slipped - Poor Engine Performance

I thought I would start a new thread, so that people can better search for the solution in the future if they have similar issues like I have had. There are too many threads that say the engine is running bad. In my case, I now know what the issue is, so might as well start a thread on it.

The Timing Gear slipped on my 2013 Scrambler 850 XP.
I will be taking pictures along the way and keep everyone posted with progress.


Scrambler XP engine by rangerbob316, on Flickr

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post #2 of 376 (permalink) Old 01-24-2014, 08:34 AM
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Did the chain jump a tooth or did the timing gear itself move? Is there a keyway or just press-fit? On a side note, my son's hockey team just played a tournament against a team from Kitchener and a few others around Toronto.


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post #3 of 376 (permalink) Old 01-24-2014, 08:36 AM Thread Starter
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I won't know for 100% until we get the motor out.
It appears the gear slipped. They are pressed on. I plan to weld it. The upper one has a shear pin so that should fail in the future

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If you can't hunt with the big dogs, stay on the porch with the puppies.

2013 Scrambler 850 XP, polaris 4,500 Synthetic winch, Tiger Tail, Triangle ATV Snorkel, CATVOS 3" Lift, 30" Silverback's, MSA Diesel M12 rims, Gorilla Axle's in the front, DHT Outlaw Axels in the rear, 1.5" wheel spacers on rear, QSC Clutch Kit, Big Gun EVO Slip On
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post #4 of 376 (permalink) Old 01-24-2014, 08:37 AM
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Hmmm, I would've assumed both were key'd. I would think a small tack weld would do the job.


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2015 Can-Am DS 90
2015 Can-Am DS 90
2011 Sportsman 850XP
Pure Polaris 2500 winch
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post #5 of 376 (permalink) Old 02-03-2014, 07:46 AM Thread Starter
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IMG_20140203_110339 by rangerbob316, on Flickr


image by rangerbob316, on Flickr

The valves were touching the piston as you can see in the one picture

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If you can't hunt with the big dogs, stay on the porch with the puppies.

2013 Scrambler 850 XP, polaris 4,500 Synthetic winch, Tiger Tail, Triangle ATV Snorkel, CATVOS 3" Lift, 30" Silverback's, MSA Diesel M12 rims, Gorilla Axle's in the front, DHT Outlaw Axels in the rear, 1.5" wheel spacers on rear, QSC Clutch Kit, Big Gun EVO Slip On
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post #6 of 376 (permalink) Old 02-03-2014, 08:10 AM
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What's the easiest way to check the timing? I have all my plastics off now playing with tps. Would like to check this before I put it all back together if possible.

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post #7 of 376 (permalink) Old 02-03-2014, 08:22 AM
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Wow that timing gear slipped a good amount. I think tack weld would be a good idea to prevent future failure.

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post #8 of 376 (permalink) Old 02-03-2014, 08:54 AM Thread Starter
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Quote:
Originally Posted by Ultra View Post
What's the easiest way to check the timing? I have all my plastics off now playing with tps. Would like to check this before I put it all back together if possible.

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I can't answer for you, my dealer hooked it up to his computer and it told him.
After he pulled the cover off the top, you can use a flashlight and look down in to the motor and you can see the two tabs that SHOULD be lined up.

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If you can't hunt with the big dogs, stay on the porch with the puppies.

2013 Scrambler 850 XP, polaris 4,500 Synthetic winch, Tiger Tail, Triangle ATV Snorkel, CATVOS 3" Lift, 30" Silverback's, MSA Diesel M12 rims, Gorilla Axle's in the front, DHT Outlaw Axels in the rear, 1.5" wheel spacers on rear, QSC Clutch Kit, Big Gun EVO Slip On
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post #9 of 376 (permalink) Old 02-05-2014, 06:17 AM
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My cam gear turned with 70 miles on the quad. Ruined the entire motor. Polaris told me they were going to rebuild the motor, I fought them, and got a brand new motor installed. I'm not happy with the quality of these machines!

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New Motor, the first one was junk
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post #10 of 376 (permalink) Old 02-09-2014, 12:45 PM
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Any updates Rangerbob316?

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