Maintenance & Technical > KX500 Original
All about reed spacers -
BDI:
After about 80 hours of dyno testing I found that a six and a half inch spacer was good for a 25 horse gain. :wink:
3Razors:
Did anyone notice a loss of top-end power when doing this mod on the KX500? I am contemplating doing this but I'm steered away at times knowing that this mod (usually) takes away top-end power.
don46:
While I think the spacer mellows the bottom, I personally don't see the deal, I know most swear by them. In my case I use the 250 carb bored to 40mm, the idea being that the slide is moved closer to the piston, the shorter distance helps improve throttle response, this has been a tuner trick for a long time. the 250 carb is much shorter than the 500 carb, so then you add a spacer and it would seem that it would take away response and maybe thats why people like them, they smooth out the "hit". For my money I want instant response.
don46:
--- Quote from: BDI on December 19, 2007, 03:55:32 PM ---After about 80 hours of dyno testing I found that a six and a half inch spacer was good for a 25 horse gain. :wink:
--- End quote ---
If I use a 13 inch spacer can I get 50 hp :-D or a 191/2" and get 75, there you go I wouldn't even need a motor just a spacer and I'd have apretty hot bike.
Hillclimb#42:
--- Quote from: don46 on December 21, 2007, 05:35:40 AM --- so then you add a spacer and it would seem that it would take away response and maybe thats why people like them, they smooth out the "hit". For my money I want instant response.
--- End quote ---
I agree with you guys 100%. They mellow it out and that is perfect for most people. Its when you want to start shaving tenths or even hundreths or add another 200 rpm's to you rev that real power is gained. The adverse side of that is that alot of people would consider it too hard to ride. When people say its like riding a bright green rocket with no brakes, it doesn't paint a mental image of alot of controlable riding. The key might actually be to start with a flywheel weight and a spacer and then progress to the after market pipe, lose the weight and spacer. The trick is to tweak the way you intend and to set it up so you can rip as fast and with as much control allowed by that bad a** bike that you have there. :evil:
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