another polaris worn cam question - ATVConnection.com ATV Enthusiast Community

Polaris Discussions about Polaris ATVs.

another polaris worn cam question

Reply

  #1  
Old 07-13-2015, 10:09 PM
Weekend Warrior
Thread Starter
Join Date: Jul 2015
Posts: 4
Default another polaris worn cam question

so i just bought my first 4 wheeler. its a 97 polaris scrambler 500 4x4. bought it not running from the second owner. with very little effort, i got it running. starts up and idles great. has no power and back fires through the carb. did a little looking and i guess the cam is a problem. so yanked the valve cover off, and sure enough, the exhaust lobe is warn.
my question is, i want to put the h.o cam in.
do i just buy a replacment cam and rocker for a 01 sportsman 500?
what jets should i put in the carb? stock h.o jets?
i saw where the h.o carbs are a little bigger compared to the non h.o
would i be better off getting a hot cam? i didnt buy it to go mudding, or to make a hotrod (i have a 10 sec camaro and a corvette for that ;]) me and my buddies like riding trails, and climbing hills. however they all run modded banshee's so id like to atleast somewhat keep up.
all help is much appreciated.
heres a link to the cam i was looking at. if a hotcam is smarter, please post a link!

New Cam Shaft Camshaft with Exhaust Rocker Arm 2001 Polaris Sportsman 500 HO | eBay
 
Reply With Quote
  #2  
Old 07-13-2015, 10:23 PM
Weekend Warrior
Thread Starter
Join Date: Jul 2015
Posts: 4
Default

the hotcam i was looking at

Amazon.com: Hot Cams 5246-1 Camshaft: Automotive Amazon.com: Hot Cams 5246-1 Camshaft: Automotive

i know ill need a new rocker arm as well with any new cam
 
Reply With Quote
  #3  
Old 07-14-2015, 02:38 AM
old polaris tech's Avatar
Polaris ATV Expert
Retired and loving it!
Join Date: Jun 2008
Location: North Texas
Posts: 24,352
Default

Stick with the cam on ebay.. Haven't heard any negative reports on them and supposedly shows it's the HO cam. Only difference between the HO cam and the non HO (3086212 cam) is the cam lobe duration. Both cams lobe height is the same.HO cam just holds the valves open longer and quicker.What really makes the HO engine different from yours is the HO cam and larger 40mm carb on 2001 models and up.Plus adding a Hot Cam or any other high performance cam without addressing better air flow,better fuel supply and a better flowing exhaust is just a waste of money. For an 18 year old model I'd keep it stock and ride it.Just my two cents.
 
Reply With Quote
  #4  
Old 07-14-2015, 09:37 AM
TLC's Avatar
TLC
TLC is offline
Extreme Pro Rider
God forbid he lets the polishing secret out!
Join Date: Jul 2006
Posts: 11,807
Default

The Sportsman 500 had the H.O treatment in 2001 Cam and larger 40mm carb.
The 500 Scrambler had it done 3 years earlier in 1998.
There was people on this site installing the cam and carb from a 1998 Scrambler 500 and making their own Sportsman H.Os well before Polaris though of it.
 
Reply With Quote
  #5  
Old 07-14-2015, 10:11 AM
Weekend Warrior
Thread Starter
Join Date: Jul 2015
Posts: 4
Default

thanks for the replies everyone.
guess ill go with the h.o cam. what about jets? do i just get a jet for a stock ho? or will i even need to change jets?
 
Reply With Quote
  #6  
Old 07-14-2015, 10:24 AM
Weekend Warrior
Thread Starter
Join Date: Jul 2015
Posts: 4
Default

i have a leaky petcock. cant find anything specific for a 97
will one for a 98 work?
 
Reply With Quote
  #7  
Old 07-14-2015, 10:34 AM
TLC's Avatar
TLC
TLC is offline
Extreme Pro Rider
God forbid he lets the polishing secret out!
Join Date: Jul 2006
Posts: 11,807
Default

Originally Posted by Cole Hadden View Post
thanks for the replies everyone.
guess ill go with the h.o cam. what about jets? do i just get a jet for a stock ho? or will i even need to change jets?
I know a person who install a used 500H.O motor into his 425 Polaris 4x4 . He kept his 34mm carb and said the 500 H.O motor ran fine without any jetting.
 
Reply With Quote
  #8  
Old 07-14-2015, 11:38 AM
old polaris tech's Avatar
Polaris ATV Expert
Retired and loving it!
Join Date: Jun 2008
Location: North Texas
Posts: 24,352
Default

Originally Posted by Cole Hadden View Post
i have a leaky petcock. cant find anything specific for a 97
will one for a 98 work?
Oem valve here.Dirt Cheap Yamaha, Polaris, Suzuki & Kawasaki OEM Parts & Accessories Cycle Parts Warehouse Or the same part # on ebay. Supposed to fit several different models. http://www.ebay.com/itm/POLARIS-3-WAY-FUEL-SHUTOFF-VALVE-PETCOCK-SPORTSMAN-500-325-335-400-330-7052161-/171455029110?hash=item27eb841f76&vxp=mtr
 
Reply With Quote
  #9  
Old 07-18-2016, 07:17 AM
Weekend Warrior
Join Date: Jul 2016
Posts: 7
Default

I have a 2000 Polaris xplorer two stroke, blowing coolant from reservoir, head gasket has been changed, fan seems to operate fine, any ideas? Thanks
 
Reply With Quote
  #10  
Old 07-18-2016, 07:23 AM
Weekend Warrior
Join Date: Jul 2016
Posts: 7
Default

Also have a 2001 Yamaha grizzly, no spark, changed coil , stator, last owner disconnected starter switch due to ??, and installed other push button, I realize this should be repaired, but it did work.... So cdi maybe?
 
Reply With Quote

Thread Tools
Search this Thread
Quick Reply: another polaris worn cam question


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: