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03 340 primary spring?

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SpencerA

Member
Mar 30, 2010
679
18
18
Portland Oregon
Oem blue and white engaged to high for my 8 year old. Tried gold and silver and super boggy now and can’t even get it up on trailer. Any ideas which spring to try?
 

RMK-King

Super-Moderator
Dec 25, 2007
1,928
1,374
113
North Dakota
You could try the Polaris black #7043120 60/340, just watch the peak RPM as that spring will add approx 300RPM. 2gram heavier weights will bring the RPM back down if needed. I can't imagine your 8yr old is going to be running wide open much anyways so peak rpm probably doesn't matter for now.
 
Last edited:
S

SpencerA

Member
Mar 30, 2010
679
18
18
Portland Oregon
You could try the Polaris black #7043120 60/340, just watch the peak RPM as that spring will add approx 300RPM. 2gram heavier weights will bring the RPM back down if needed. I can't imagine your 8yr old is going to be running wide open much anyways so peak rpm probably doesn't matter for now.
went back to oem set up. Have my 8 year old get used to high engagement.
 
S

SpencerA

Member
Mar 30, 2010
679
18
18
Portland Oregon
Huge difference in performance with the lighter weights and stiffer spring. I did notice though the manual calls for a 8 and not 9 plug. PO had 9's, I read a previous post that said changing the plug made a big difference in their sled. What do you guys think? I'm going to put 8's in regardless but I didn't have a chance to test it.
 
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