This was a email I sent to slp , my question is at the bottom and thier response is at the top.
Hello,
The load from heal weight verses helix is different so you cannot accomplish as much efficiency with the helix otherwise developing the MTX and Magnum Force would not have been worthwhile.
On the most part all weight available other than ours resemble the OEM profile which was originally designed for low end torque triples. They will not load a high torque twin enough to match the torque curve real well no matter what you do with the helix.
The mass distribution and contour is a little different between the MTX and Magnum Force. Even though the MTX is still widely used and preferred the Magnum Force is the latest technology and efficiency.
Increasing the initial angle on the helix will increase load low to mid which the weights do to but the weights reduce a huge amount of belt slippage which the helix and conventional weights tend to make worse. Comparing “best” setups on an 800 both ways the Mag Force is 3-5 lengths faster depending on conditions. That is accomplished by more belt traction (less slippage) and matching the torque curve better.
Thanks
Starting Line Products
743 E Iona Rd
Idaho Falls, Idaho 83401
208-529-0244
Hi
Do you ever use mtx weights comboed with a progressive helix like a 60/42, does the extra heal weight compensate for a few deg meaning ie, be able to use a 58/42 with mtx and 60/42 without?
Or do these do 2 sperate things? Both load the motor correct,?
Second question, are the new magnum weights the same profile and heal weight as the original mtx weights?
Tks for your time.
Jeff
jacey welding ltd
fyi the magnum force have a lower heel HEIGHT than the mtx and require different shims under the spider.
they act very similar in shift characteristics to the mtx when the magnum force are fully loaded. However it’s hard to load the “heel” heavy on the magnum force if you are running in the lower end of the adjustment range.
I really see two methods of clutching out there.
trs, indydan style, low helix angles, light springs, light weights (not heel heavy)
(works with stock gearing or low gearing regardless, long lasting clutch wear items)
MDS, Carls cycle, SLP, A2d style, steep helix, stiffer springs, heel heavy weights.
(is favored by super low gearing/ more prone to overrev, DET and clutch wear.