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Discussion Starter #1 (Edited)
2011? 250 recon es in otherwise very good condition. Fixing it for a friend. Extremely hard to pull start. Rips-your-arm-off hard. Electric starter can't do it either. The carb was trashed internally from gas sitting in it so it won't run for more than a few seconds but it will run. But wow this thing pulls hard. Get it past the compression stroke and you can pull it ok. As far as I know it has never been apart so the timing is unlikely to be off. I've looked at the service manual and this thing does not appear or mention having a centrifugal compression release for starting. Am I correct? Have any of you seen carbon buildup so bad that it causes this problem?
 

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Had a pressure washer do that, exhaust valve stuck and bent push rod. No help I know

Did you remove the plug and pull the rope starter? Cylinder full of fuel? Crankcase full?
 

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what is the compression reading on things?
and I would never say anything cannot jump time, it can happen on newer and used atv's
you have not listed hours or miles on the motor(or know if it has tracking of them)
but timing chains can stretch and thus jump time and MANY honda models are even known to do so!
so, maybe start checking timing and see where its at from there!
 

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that motor has a automatic decompression release built onto the cam.
 
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that motor has a automatic decompression release built onto the cam.
is it not working, causing a problem, with to much pressure? i dont know this territory yet.
 

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Discussion Starter #8
that motor has a automatic decompression release built onto the cam.
Ok... So the next step is to pull that cam?m I couldn't find a service manual for that exact model but I can't find any info or diagrams showing the auto compression release.
 

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that motor has a automatic decompression release built onto the cam.
Ok... So the next step is to pull that cam?m I couldn't find a service manual for that exact model but I can't find any info or diagrams showing the auto compression release.
once you see the cam ?, you will see how its made onto the end of the cam. look your year/make/model up on partzilla.com, and have a look at the cam, then you will see what I am talking about :).
 

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Discussion Starter #10
I looked at the pic. Nothing real obvious that looks like it's a compression release. Guess I see better when I get it apart.
 

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I looked at the pic. Nothing real obvious that looks like it's a compression release. Guess I see better when I get it apart.
word from the wise !!!..DO NOT PULL THE CAM OUT UNLESS YOU HAVE THE TOP END TORN DOWN, AND THE CAM FOLLOWERS REMOVED FROM THE CYLINDER !!. WHY : if you do not do this, and you remove the cam first ?, YOUR CAM FOLLOWERS WILL DROP DOWN INTO THE LOWER ENGINE..AND RUIN YOUR DAY !.
 

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Discussion Starter #13
I looked at the pic. Nothing real obvious that looks like it's a compression release. Guess I see better when I get it apart.
word from the wise !!!..DO NOT PULL THE CAM OUT UNLESS YOU HAVE THE TOP END TORN DOWN, AND THE CAM FOLLOWERS REMOVED FROM THE CYLINDER !!. WHY : if you do not do this, and you remove the cam first ?, YOUR CAM FOLLOWERS WILL DROP DOWN INTO THE LOWER ENGINE..AND RUIN YOUR DAY !.
Great tip!!! Thanks!
 

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It sounds to me like the flywheel woodruff key is partially sheared, which causes the ignition event to be early, which kicks back when it fires and jerks your arm out while you're yanking on the recoil.
 

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I saw someone else mentioned it but didn't see if you confirmed... How easy does it pull with the spark plug out?
 
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most gas engines turn over easy with the plug removed.
 

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Discussion Starter #19
Finally decided to mess with this again. The cam has no compression release built into it. The intake lobe is .020 under minimum. The exhaust is .005 under. Going to get a new cam and followers tomorrow.
 
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