General > Riding Tips & Tricks

Modern Axle Blocks for the k5

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Hillclimb#42:
Woah,  that may be another thread in itself. 14-47 is too close to 15-50 to ever switch one out for the other, Maddoggy. I always shorthand the math with the theory that one tooth on the front is equal to three on the back. Then you still have to be clear if you are gearing up or down in that math. Most guys change two in the rear like I am saying works well with these blocks. One tooth in the rear is barely noticeable. There is another school of thought, that if you need to change gearing, then just change the front sprocket one tooth, which is definately noticeable.

I have made number tables for hillclimbing using this formula;
Back sprocket teeth count  divide by Countershaft multiply Primary Gear multiply transmission gear = final ratio
                                          Primary on my 500 is 2.680, I always run 2nd gear and thats 1.444
example    47/14 =3.36    x 2.680 x 1.444= 13.002
                 50/15 =3.33  x 2.680 x 1.444 = 12.8997
                49/14 = 3.5   x 2.680 x 1.444 = 13.545
            or 47/15 = 3.13 x same stuff = 12.125

That final drive number represents the number of times the front sprocket has to turn to turn the rear wheel once. So you having that ratio would keep you at 13 :1 Front Sprocket to Rear sprocket. You want to change at least a half of a number, and maybe closer to a whole number to make a noticeable change. It gets pretty deep when you want to figure out all of the choices. Thats how i do it.

ktmdude:
There is some smart mo fos on this site. My head it still spinning. lol.

Goat:
Those blocks sound like an excellent idea. If anyone does make some let me know. I would like a set. If I had the machines to make them I would. Make things easier when I change my rear from nobbie (woods riding) to paddle (Dunes) as I run different gearing.

maddoggy:
i posted the wrong rear sprocket #. sorry, i meant 14/45. i guess i had stock gearing numbers on the brain. i want to lower the gearing some. the 15/50 has always felt a bit higher than i like for all around riding. the 50 is worn out so i will need to decide what other size i want to run when changing as well. heck maybe i'll shoot a little lower than the 14/45 combo for the local riding, and do the 15/50 for dune riding. i'm a little lazy when it comes to gear changing. i tend to just ride wherever with what is on the bike, but i hate riding the current combo locally because the available riding areas are either really rocky/boulder strewn trails or just small tight little open spots. anyhoooooo.........................

Hillclimb#42:
ktmdude, thanks, but I am not 100% that I'm right on that, but I think I'm close. I am waiting on the real smart guys to say what I'm overlooking. Sometimes its hard to post on here because I want to post correct info, and not guess. Usually some body throws in better facts. I see the countershaft turning 3 point something to turn the back sprocket, but still not getting what the final number is. I need to go back over that stuff. Maybe its turns of the crank to turns of the tire. something like that.

Goat, I am hoping one of our Kxrider machinist buddies will take this idea and run with it, too. I am a carpenter, but I don't think anyone wants them made from wood. :-D I guess I could make a mock-up out of oak. :?

Yeah, I hear ya' Maddoggy, its confusing. I would say that changing front and rear sprockets, instead of one or the other, adds to the mess. In my way of thinking, 14-45 = 15-48, or 15-50 = 14-47. They are not exactly the same, but close. 15-50 is a bit tall? then you would want like 14-49. Or you start running first longer before shifting. I don't know, its all preference and conditions, like you are saying. I don't change my gearing very often. Its kinda like jetting, once you find the sweet spot, and its finally dialed in, I just do a couple on the back, one way or the other. But each bike likes its own gearing. I did my homework on the charts to see what gearing I needed to pull 1st or 3rd gear holeshots and how close i could get the ratios to 2nd gear pulls. To make a long story short, 1st and 3rd gear holeshots are not close to 2nd gear ones with the standard sprockets, 13, 14, 15, 49, 47, 45.

This is how the blocks look on the Cr. We have a lip on the stock blocks of a kx500. Ours would have to be different design, but same dimensions from center.

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