Maintenance & Technical > KX500 Original

What about 500 vs 250 transmissions?

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Hillclimb#42:
 Nice Link BigGreen. Thats more like what I was lookin at. I think the k5 turns more r's, or definately can. They don't list max Rpms in manuals and probably can't. Also any mods in performance, change max rpm. A pipe can shorten max rpms and make it get there faster, or vice versa. I think everything has been dyno'd so its possible to get close to knowing, by finding results of a similar bike. Cranks, piston mods, probably even timing can affect max rpms. Thats where the big money is spent. 8-)

BigGreenMachine:
Lessening rotating mass is the easiest way to increase max rpm, shaving the flywheel for instance.

Max KX500 RPM is around 10000?

BDI:
What ever you do don't take me the wrong way I like your approach I was just giving you a hard time. I have spent countless nights staring at the ceiling trying to go to sleep thinking about ways to get to the top of the hill faster. soon you will realize just how little the other guys really know and they will be trying to chase you down. It does not surprise me that you baffle people buy telling them you are under geared people just assume to climb a hill you have to gear down and they will gear down and go slower and they will want to gear it even lower trying to go faster. I like to gear It right to the point the bike does not want to peak out In rpms and then back it off a little Or figure out how to sqeez out a couple more ponies to make it pull the gear. keeping the gearing right at the threshhold of horse power Is how you are going to be the fastest. You should try 14/45 It's a tall gear your bike should pull and It makes your wheel base as long as It can be with stock swing arm It's my favorite gearing and I have tried a lot of gear ratios.

Hillclimb#42:
 That is the next step up in gearing. I'm 14-47 which is pulling 13.002:1 in second and if thats not tall enough then 14-45 is next. That is 12.480:1, which is how I think you need to change things. 1/2 of a whole number at a time.
 I don't take you or anyone else the wrong way. I just sort through the opinions for a common thread or I learn enough to agree or disagree. Some of the answers seem to be throw money at it, but I could spend another 5 grand on each bike, but I'm not loaded. I know what you're saying is right. I have to pull the tallest gear possible without a bog and without being at absolute top rev. The difference is that my gearing is for steep, solid traction with jumps. Where your experience in the sand is telling you that I'm way under geared. I am thinking that I'm close, or at least closer. I also needed the info for adjusting gearing between rounds, if its not. Wish me luck. I'll let you guys know how it goes, rippin this weekend. Later!

BDI:
I disagree It's my experience with the kx500 that is telling me that you are under geared. I'm not just some sand pansy, I grew up In the nevada desert ridding with my dad and uncles who road things like yz490s'  and TT600s' I road on an 80 they would climb the steepest nastiest rocky hills they could find. If It allready had a trail on It there was no reason to climb It because some one has already done It. If It was something they had a hard time getting up then they would sit there, smoke ciggaretts and drink water waiting for the boy to make it up. You have no idea how many times I have heard "GO BACK DOWN GET A BETTER RUN AT IT AND HOLD IT PINNED" Then as soon as I would get there the rest break was over and It was time to go again that's how I learned to ride no mercy and the fact that I can't find any one who likes to ride with me Is testament to that. I have climbed a hill or two that were not sand. The thing I learned about gearing Is those little asian people know what they are doing and the gear ratios In your tranny are optimized for the engines  horse power output and delivery the gear ratios that work best are not far off of stock gearing I spent a lot of time and money figuring this out sprockets are not cheep. Good luck and go kick some but and take that reed spacer out and give It to a competitor That's free performance  :lol: :lol: :lol:

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