Clutch weight vs Helix angles

VenomMod

VenomMod

New member
Joined
Jan 11, 2007
Messages
519
Location
Houghton, Michigan
I know you're suppose to adjust RPMs with your clutch weights, but I was wondering what people like to do with there clutchs. Is it more advantageous to run heavier weights and lighter angled helixes or steeper helixes and lighter weights?
 

In my opinion i always like to go with heavier weight/shallower helix combinations, and the simple reason is: BELT GRIP. When you start using lighter flyweights with a more aggressive helix the clutches are grabbing the belt with silk gloves and it is very easy to get belt slip. Using heavier weights and shallower helixes allows much more belt grip. This in turn also allows you to run less twist on the secondary spring because it doesn't need to be way stiff to grip the belt in the secondary. Running less secondary spring force and twist increases your efficiency as long as the belt doesn't slip in the secondary and it doesn't overshift out of the hole. That is my breakdown in the simplest terms. Hope that helps.
 
It does, but with the lighter weight, does it make your sled snappier? My sled has a bit of a bog, and would like it to leave. I think though that i should mess with the needles. I just want the throttle response to be right there. I don't really want to put reed spacers on and all sorts of aftermarket accesories. Thanks for the input.
 
Last edited:
If your sleds got a bog, it's likely in the jetting. Lighter weight can make the sled feel snappier but it all depends on setup. I would go the heavy weight/shallow helix route. Even if the sled doesn't feel faster (which it should going this route) it will be and you will have better luck racing against your buds.

Couple questions about the bog are...

When does it bog? Right from a stand still and punch the throttle?
What are you running for carburation?
Have you done any intake mods? (reed stopper notch, reed spacers, aftermarket reeds)
Any other mods we should know about that could affect performance / jetting?
 
It bogs right at the punch of the throttle, before I had my engagement at 4800 RPMs and the bog wasn't a problem, but now that I'm around 4100 it is. 143.8 mains all across, 42.5 pilots, needles stock setting, I don't have any aftermarket intake mods. I am waiting on my Viper Forced Air Ducts though. Mains will probably be jumped up one size when I install them. It is piped. All carb settings are set to Hauck specs for their pipes.
 
Hows your belt? An old belt or improper belt height in the secondary will make em dog comming out. Make sure that belt is riding all the way up in the secondary, it should actually sit a little higher than the top of the sheaves.
 
I would try and turn the fuel screws out some more. Sounds like the classic lean bog from the SX motors down low to me. I had the bog until I went up to 45 pilots on my piped 600 SX. Not saying you have to go that high, just try turning them out a half a turn for now and then 1/4 turn at a time after that until you get it perfect. Once you get past 3 turns out on the fuel screws though it's time to get bigger pilots.

One other thing that helped was the reed stopper notch. 7000 kms on the sled since I did the notch and no problems, just better throttle response, although some people don't like the notch, they prefer spacers instead.
 
I may have to give it a try. I'm heading home for spring break so I'l have access to all my tools. I'll let you guys know how it worked when I get back. I've got my fingers crossed. I'm not having the best of luck in tuning so, something going the way it's suppose would have me doing backflips.
 
Last edited:
You must log in or register to reply here.


Back
Top