Maintenance & Technical > KX500 Original
KX500 BIG BORE KITS
jigggawatt:
Hell I would like to make my 500 a 350 . I must be getting old :-D
hughes:
Getting good clean jetting will improve the power output greatly and it's cheaper. Do you have the stock carb for an 87 kx500? I am having a hard time finding jets for the VM38 carb. All the info I can get is that the carb and jetting for that year bike was special made and no O.E.M parts available. I'm looking at buying a new VM38 from tuckrocky so I can get the jetting under control on my bike.
monster malibu:
The jetting seems to be right on, the bike starts good and runs down the trail like a freight train. I just want more power/torque. Pretty much everything I own with a motor on it is not stock in any way(sled,4x4 truck,car,bike). I live in a small town and get some interesting responses when I tell people I just bought a KX500. My brother took my bike for a ride and said he doesn't like it. His exact words were "THAT THING'S TO F#%^*(! FAST, YOUR'E GOING TO KILL YOURSELF ON THAT"
BigGreenMachine:
--- Quote from: hughes on July 02, 2007, 01:53:55 AM ---Getting good clean jetting will improve the power output greatly and it's cheaper. Do you have the stock carb for an 87 kx500? I am having a hard time finding jets for the VM38 carb. All the info I can get is that the carb and jetting for that year bike was special made and no O.E.M parts available. I'm looking at buying a new VM38 from tuckrocky so I can get the jetting under control on my bike.
--- End quote ---
I just sold my two season old Mikuni TMX 38mm to a fellow triker. Great carb.
Mikuni VM should take mikuni large hex main jets hey?
kawsf:
If you want easiest big bore go with the 540.you can get the piston from la sleeve.
They have a copper head gasket that?s 60 thousands thick, it will smooth out the power.
The head needs to be cut 3mm bigger, and grind the power valve to fit.
Just send the cylinder to get replated to that piston. You don?t want to use the steel sleeve.
As for the carb use a number 8 slide, it will give you a lot better off idle response.
This set up is a lot smoother and way more bottom end than kx 500, been running one like this for 12 years.
If you need to know more about this setup just let me know.
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