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Discussion Starter #1
Hi all, new to the forum and new to atv’s. Forgive me if this is a stupid question.
I recently bought a 2018 Sportsman 450 HO and a 2018 570 SP. Both have under 50 miles. At full throttle, top speed, the 570 tops out around 6600-7000 rpm, but my 450 tops out 5600-5800 rpm at top speed. Even spinning tires on snow and ice I’ve barely seen the rpms on the 450 get above 6200.
Is this normal? I’m riding at 5000’ - 7000’ elevation, do you think the clutch needs to be adjusted for elevation? Is there an RPM limiter during break in? It just feels/sounds like there’s a lot left in the 450 that I’m not tapping in to, and I would like to get to know what to expect out of my ride before just shrugging my shoulders and assuming that’s all she’s got...
I realize it’s not going to hit 8000 rpm like my 2 stroke mountain sled, but having no experience on single cylinder 4 stroke atv’s I feel I should ask the ones who know. (My dealer looked at me like I asked him what the appropriate thrust was on an intercontinental ballistic missile)
Thanks..
 

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All sounds normal. If you bought the machine at that elevation the clutch should be adjusted for it from the dealer. You can have the ECM re-programmed from the likes of RVSPerformance. They'll raise the rev limiter and open up both machines. The manufacturer leaves a little to be desired in the tuning department so to make the machine emissions compliant.
 

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Discussion Starter #3
Thanks bp405,
Good to hear. I’ll just keep on riding it, and try to quit over-thinking / over-analyzing my fun.
(Easier said than done🙄)
Cheers!
 
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