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More Spring or Less Weight??

P

probill

New Member
Messages
9
Age
70
Location
Ontario
2016 SB 800. Changed gearing to 22/38 . Changed Primary spring to 120/310 . Installed 70 gram Polaris 10 series weights. Changed secondary to 50/44 Full progressive with 7043151 Polaris spring. (forgot to write down what the rate is. Will have to look it up and post later). In stock form sled would pull 8400 no prob all the time. Now I only pull 8000 and maybe 8050. Should I install a higher finish rate primary spring (I have a 140/330) or should I go to 68 grams weights?? I run the Gates belt. Clutches are cool to the touch. Belt to sheave clearance is .15
 
10-70s are a lot of weight for a stock engine.
 
What about if your riding hard enough to get the pipe temp up so it's crispy and then pull it hard from say traveling around 6500 rpm will it pull higher rpm,less or same. ?
 
probill said:
2016 SB 800. Changed gearing to 22/38 . Changed Primary spring to 120/310 . Installed 70 gram Polaris 10 series weights. Changed secondary to 50/44 Full progressive with 7043151 Polaris spring. (forgot to write down what the rate is. Will have to look it up and post later). In stock form sled would pull 8400 no prob all the time. Now I only pull 8000 and maybe 8050. Should I install a higher finish rate primary spring (I have a 140/330) or should I go to 68 grams weights?? I run the Gates belt. Clutches are cool to the touch. Belt to sheave clearance is .15
Click to expand...
Are you sure that's the right part number? I don't see it in the Master Repair Manual.
 
7043057 140-200 red/blue
 
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I didnt check it specifically from around 6500 but I was on a lake for about 30 minutes and I really dont take it easy on this sled so i am pretty sure the pipe was good and hot. I just got it on a straight away and ran it hard. The RPMS just top out and stay at around 8000. Last year in stock form this thing was a rocket and would pull hard and fast. I think I need to get the RPMs up to see if the snap will get back in to this sled. Dont know if I should try it with a new spring or lighter weights.
 
I would drop to 68 grams. Im resistant to running springs over 310 not that I would rule it out but just explore the other direction first. See where the 68 get you. Is what I personally would try first.
 
whate it do when you launch it out of hole. Does it overshift (drop rpm) and have a hard time recovering as opposed to pulling it fromhigher rpm while moving at speed ? Or no matter what is it 8000-8050.
 
i was going to post the same questions....my set up is almost the same except the 48/44 helix and stock spring in the secondary 123/203...pulls like a whore down low...but doesnt pull past 8000...maybe sees 8050.
 
Also, the red/blue spring has a low spring rate. It may work with the 68's, but I doubt it will work with the 70's. I vote for the 68's and try a black/green (140-220) and see if you get your rpm's back. If you get them back then you could try a 140-200 or a 155-222.
 
Lid....Thanks for the suggestions. I never tried to launch it so cant say what the RPMs are. I will try that this weekend. I have 68 gram weights so will try that this weekend. I also have the 155/222 spring. Do you think that would work with the 50/44 helix or should I put the stock helix back in and try it with the 155/222 spring??? thanks
 
The spring rates 120/203 is 73#/ in, 140/220 is 73, 160/240 is 72, 155/222 is 61, and the 140/200 is 54. For example when the secondary starts to shift out the 140/200 is going to allow the secondary to shift out much quicker then the stock 120/203.
 
Try just changing to 68 first. One change at a time. And see how it responds. Then you can play with secondary spring to sort of fine tune . the 68 will change the characteristic of shift so try that change alone.
 
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