Snowmobile Fanatics banner

1 - 16 of 16 Posts

·
Registered
Joined
·
116 Posts
Discussion Starter #1
How can i add more Top End RPM. Do i have some adjustments on the clutch or i need to change weight or others parts???? (Polaris XLT)
 

·
Administrator
Joined
·
13,092 Posts
What are your RPM's going to now? How much higher do you want them to go?



http://www.bolliger-mabillard.com

I Love B&M Coasters.
 

·
Registered
Joined
·
1,172 Posts
The two clutches work together as a team to accelerate you at a RPM determined to be best by the manufacturer. If you exceed this you can actually loose a lot of power and torque. If your Rpm dropped, and thats why you want to increase it then something is wrong in the clutches. To answer your question the easiest way to increase top end rpm is to go with a lower angled helix . But you dont want to sacrifice accelaration so you need a progressive helix something like a 42-34 should get you about 200 more rpm than the stock 36 degree at the top end.
 

·
Registered
Joined
·
2,584 Posts
I hope you aren't going on a principle of the more RPMs the better. Sleds produce their best power in certain ranges. On the SXViper it is around 6300 to 6500 I believe. Have to check on that but it isn't important you understand what I am saying, least I hope so. Also most clutchs on the secondary they have multiple holes to place the end of the spring in. If you switch it into a differnt hole it adds or decreases RPMs slightly. Try moving it to a different hole then take a run. If it went down then move it to the oppossite way. If you are at the end and can't go anymore then I would do helixes.



Edited by - Sled_Dog on February 07 2002 1:48:42 PM
 

·
Administrator
Joined
·
13,092 Posts
for a 200 rpm increase, take your helix off and tighten the spring by 1 hole, that will bring it up by about 200 rpm. If you lose performance (come out of your powerband) take the helix out and put it back.



http://www.bolliger-mabillard.com

I Love B&M Coasters.
 

·
Registered
Joined
·
116 Posts
Discussion Starter #8
Tightening the spring will not put more pressure on the Belt and Decrease RPM??? I was thinking i need to losen the spring pressure for have more RPM
 

·
Registered
Joined
·
278 Posts
By increasing the spring pressure it is harder for the secondary sheeves to separate causing the belt to ride higher and alowing the RPMs to increase.
I just replaced the spring and helix on a friends Indy 500 tonight and moved the spring tighter by one hole. It seems to help the engine stay in it's power band better by delaying total upshift.

2001 ZL800
Delta IIs
Power Breather
MBRP Silencer
Coupling Kit
Goodwin Clutch Kit

Creek beds don't make good brakes!
 

·
Administrator
Joined
·
13,092 Posts
Rtkat is right.



http://www.bolliger-mabillard.com

I Love B&M Coasters.
 

·
Registered
Joined
·
116 Posts
Discussion Starter #11
OK, but if the belt stay high in the clutch, the speed will decrease. Well, its not i was thinking
 

·
Registered
Joined
·
3,188 Posts
Well, you could always try a little re-gearing in the chain case for more top speed. Otherwise, tripple pipes will raise the peak horsepower to a higher rpm, and ultimately more speed, and power. However, re-clutching is a must.
 

·
Registered
Joined
·
116 Posts
Discussion Starter #13
What's the difference between a 22/41 and 21/39 gear???? The ratio is the same but not the gear... It is better to have bigger gear for the same Ratio???
 

·
Administrator
Joined
·
13,092 Posts
The difference between 22/41 and 21/39 is the 22/41 has a longer chain (I think)

Having 2 smaller sprockets would require a shorter chain.



http://www.bolliger-mabillard.com

I Love B&M Coasters.
 

·
Registered
Joined
·
8,842 Posts
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>Originally posted by fortress:

How can i add more Top End RPM. Do i have some adjustments on the clutch or i need to change weight or others parts???? (Polaris XLT)

[/quote]
I agree I would simply go with less helix smaller numbers but just the next size down from stock. If you want to regear I would drop my top sprocket down to a 20
I would not by pipes.
I had a 95 with pipes and a 20 tooth top sprocket and still never ran out of gear on top end but it had a great corner to corner or holeshot. but did the sled always run at 8000 or did this just start
you can email me I do clutching for speed running.
 
1 - 16 of 16 Posts
Top