Should I replace the carb when doing the ho cam? If not is there side affects of running the non ho carb? Thanks

 

Cots of the carb and intake manifold(around $550) isn't worth the effort on a a 17 year old machine for the hp gain imo.The only difference in the HO cam is the duration(holds valves open a tad longer),lobe height is the same on both style cams.A lot of people have just swapped cams with no problems on non HO machines. Plus you have the best carb(BST34) as far as reliability and easiest to rebuild when it's needed.The BST40 carb was always dribbling gas,the float was hard to adjust to keep it from doing this,plus the long cable idle adjuster could be a pain versus the straight idle adjuster on the BST34.Stick with the updated cam and enjoy it as is.

 

Thanks for the info

 

I have another question for ya. My old man has a 98 and his clutch is rubbing the clutch cover. This 99 is doing the same thing. Any ideas why?

 

I put a Web Racing cam in my Arctic Cat and a 5 degree advance timing key and a K&N filter and removed the restrictive flame arrestor from the muffler. Was easily able to tune my stock Keihin carb to make it really haul azz. I ended up running the Dynojet needle on the 4th c-clip and fattened the main jet from a 150 to a 155. You may have to slightly richen the pms screw and go up 1 or 2 size main jet, but thats a wild guess. My guess, the Web cam is a lot hotter than the HO Polaris cam, but if someone makes a timing advance key for it, you might see a nice gain, but may have to run premium gas.

 

Both clutch covers have been updated,but before you check in to replacement covers which are larger and beefier around the drive clutch,you might try adjusting the small "L" bracket that supports the backing plate. By moving it out just a tad on the frame I've been able to stop a lot of drive clutches from grinding against the covers. All would grind at an idle,stop when you gave it a little throttle as the clutch would move inward away from the smallest part of the cover that would sometimes melt down from heat and would touch. Item #25.Dirt Cheap Yamaha, Polaris, Suzuki & Kawasaki OEM Parts & Accessories – Cycle Parts Warehouse Item #26.Dirt Cheap Yamaha, Polaris, Suzuki & Kawasaki OEM Parts & Accessories – Cycle Parts Warehouse If moving the bracket doesn't help,you could always jump to the latest covers that are cheaper than your replacements. You'd have to adapt the larger exhaust outlet to work with your smaller duct but many people have.2002 2012 Polaris Sportsman 400 500 800 XP Clutch Belt Cover 2633926 | eBay

 

Thanks again!!

 

Thanks for the info on the BST34. Good to know.