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800 top end rebuild

7.7K views 16 replies 3 participants last post by  Steeltom  
#1 ·
I have a 2012 800 that has around 9k miles on it. Had a loss of power for sometime and figured it was time for a new top end. Pulled everything off and took the head off and got everything torn down to the pistons. I removed the lifters from left to right and all were good except the far right one next to the cab. It was cupped pretty badly. Looked at the cam and it doesn’t seem too worn. Would I be okay to just get a new set of lifters and try it? I didn’t plan on completely removing the engine and I think that’s the only way to remove the cam. Thanks for any help or suggestions
 
#7 ·
Here's a Ebay listing for one from Caltric for $39.85 - it will also bring up a listing for that includes camshaft & lifters for $68.85

Can't speak to the quality of their camshaft, but I've bought other parts from Caltric for motorcycles & RZR and was pleased with the quality.

 
#11 ·
Thanks again guys for the help. I was thinking I could get by with not splitting the case and just removing the cover and stator and flywheel and pull the gears off and slide the cam out. Maybe I was just thinking wrong on that. One thing that is a little confusing even after reading it in the manual is getting the gears timed back.
 
#12 ·
That can be a little tricky but they all have marks but I have read on people's rebuilds that they mess it up and have to split the case again lol. Can't remember what gear but oneof them you have to heat press it back on and line up the gears at same time. Are you just replacing camshaft or are you going to rebuild further? Like I said seems full rebuilds are not much less then buying a rebuilt drop in motor ready to go.
 
#15 ·
Pretty much everyone recommends splitting the case to replace the camshaft - there are advantages to doing this as you can check and make sure that all of the bottom end is in good shape,
If you review the "Polaris Bottom End" video that I attached - it shows how to set timing gears during reassembly (starts around the 40 minute mark)
- I would suggest you watch the whole video along with the "Top End Build Up" one done by the same guy - there are many helpful tips in them.

Are you still trying to replace camshaft without removing engine & splitting the case?
Here's a link to an old thread on the question, that has c2turbo "David" with "Complete Performance" in Marietta GA saying it can be done.
- looks like his last post on the forum, was in May 2013, but it appears that they have a active Facebook page
(see his comment below)
(YOU CAN change the cam with out splitting the cases did one last week. you do have to pull the motor and side cover. you don't have to pull the head off but take the rockers out and push rods. we use 4 magnets to hold up the lifters pull the side covers and magneto and 2 gears slide the old cam out molly up the new one slide it in and reassemble.NOW with this being said ! Polaris recommends that the lifters be replaced, this can be done without splitting the cases but not without removing the head.the whole deal can be done in about 2 hours once the motor is out which is about another 45-1hour if you are fast and everything goes well
Thanks David
complete Performance
770 519 7525

Good Luck
 
#16 ·
A little update here. So I got everything tore apart all is well. New cam in and getting ready to time it. So I put the crank at top dead center lined all the gears up correctly and put the bolts in. I test it and spin the crank once and I see the cam gear is not in time. The crank spins twice to one on the cam. Here is a picture of what I’m talking about. The second picture is after one spin of the crank. My question is that correct. After 2 spins of the crank everything is in time again. Am I off on my timing 180 degrees?
Image

Image
 
#17 ·
Here's a couple of old posts that should help answer your question