Maintenance & Technical > KX500 Original
What about 500 vs 250 transmissions?
Hillclimb#42:
How weak. $2000 computer and can't use it any better than a 5th grader! I may have to wait on the girlfriend to help with the program. Thanks Paul. I'll be trying to get that to work this evening. :x :x
Hillclimb#42:
Alright, for anyone who is interested, I think I have figured it out. I actually am surprised at how little overlapping that there is in ratios.
Anyways here it is.
1.Find your primary gear ratio. Every bike is different, even from year to year.
2.Multiply that by the ratio of gear that you are in. i.e. 1st, 2nd, 3rd.... by that ratio, which is also model and year specific.
3.Then multiply your sprocket ratio. Which is on the gearing chart. Or can be figured by dividing back sprocket by the front sprocket.
Here is my sample problem for you math haters. :-D
Primary ratio of 2.68 x Second gear 1.444 x drive ratio sprockets (13-47) 3.62 = 14.009 rpm's to turn wheel once.
I changed to a 14 countershaft sprocket.
Primary 2.68 x Second gear 1.444 x drive ratio sprockets (14-47) 3.36 = 13.002
The final number, I think, represents turns of the motor to wheel. Whatever it represents gives a number to go by. I have done the math on 13,14,15 with 45,47,49 combinations and compared that with 1st, 2nd, 3rd gear ratios and there is hardly any overlapping of ratios. You think I'm right on the math or am I still off? Before I was throwing a final drive ratio from the manual which represented stock sprocket ratio. Check it out, I'm here for opinions.
BDI:
some times you can over think things But I like the fact that you are trying to make your own tracks rather than follow In some one elses. You don't sleep at night do you.
Hillclimb#42:
It actually stems from me telling buddies that I think I'm under geared. Then I get different answers from everyone, who should know about the cure. Then I want to make an educated change and not a shot in the dark. I started racing to have fun and now it is hard not to be as competitive as possible. Why spend the time and money to show up and get spanked by some 14-15 year old kid. It still happens, but not without me being close. I like making other better riders go for it. I rip the conservitive line and they have to jump the big nasty to win.
I realize not too many people are looking at these numbers this closely, but there is alot of performance in gearing. The thing is, I don't want to throw a sprocket on there without a clue on why or what its gonna do. The 250 won't thrash me and my pride nearly as fast as the 500.
I sleep normally, but am usually dreamin about riding, racing or fixing kx's. 8-)
I notice the time on posts is way off, but I'm not sure if thats me or the time where the site is based.
When not riding, racing or fixing I'm jonesin' for it. Isn't everybody?
BigGreenMachine:
http://www.everything2stroke.com/resource/gear.php
Anyone use this? Is it accurate??
I plugged in the gear ratios for an 88 KX500 and came out with a 76mph top speed at 8500rpm. That right?
Thats with stock sprockets and a 27 inch tire height.
Someone correct me if I'm wrong. WHat rpm does a stock KX5 max at?
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