If you think 1.5mm helps (and it does) can you imagine having the equivalent to 3mm of shims?
Stock is 2:45 :1 initial cvt ratio, with 1.5mm of shims you get about 2.75:1 initial cvt ratio, with my Coop45 sheave +0.5 shim I'm at 3.1:1 ratio.
I measured mine finally, and after machining, and no shim now, I'm just a hair over 3:1,
so I'm intrested to see where i sit with the 0.5mm shim added back in
My bike does over 60 mph on gps... And remember I only have a 37 hp 550 with heavy Growlers tires . That's the beauty of a machined sheave. You get your cake and eat it too!!!! Way more of the line torque with basically no top speed loss.
I don't plow or do much work with this bike. But I do alot of slow technical riding and yes the extra low gearing is awesome !!! High range ends up between high and low, and Low is just ridiculous when compared to stock cvt . Low speed crawling was much improved on my quad. Again when compared to stock.
A stiffer spring will slow your CVT from shifting up. Keeping you in a lower gear longer. It also improves back shifting ( down shifting) . Your engine braking will be stronger. And it adds clamping force on the belt witch will prevent slipping in extreme duty situations
everything vincent said right here is spot on, my 700 kodiak hit 104kph(64mph) stock with slightly heavy 26" reptil radials. Now, after machined sheve, griz weights, and purple spring, I hit 108kph, (67mph), and at a much quicker and smoother rate.
That's impressive. That must pull the front end up off the ground quite easily. Did you loose much top end? I don't care a whole lot about top end speed because I rarely go that fast, but it is fun getting there quick. Do you do any plowing with it? I may add a stiffer spring later, right now I don't want to get it to the point that it's to hard to finesse the throttle when plowing or hauling a trailer full of firewood. This is the only thing holding me back from doing more right now.
oh yeah, in hi, i barely have to put effort to lift the fronts, in low, if i punch it hard, I can't keep it from lifting the fronts, mind you I'm a big guy 300+ and naturally sit further back on the seat. But I find throttle control is better now, finessing over objects is easier, so I think you will have no issue plowing.
All good stuff. I just might have to do the secondary spring next summer, I won’t be doing much more than plowing or hauling firewood this winter. You recommend the purple spring with the 1.5mm shim? That seems to be the most popular.
purple is a very good choice, especially along with the 1.5mm shims.
