Maintenance & Technical > KX500 Original
crank stuffer
kaw rider:
Bdi
i had stewart cut the base. he has the tooling for it. that cylinder was .004 warp. set up for zero deck height. plus tighten up CCR. i did all the exhaust mods and porting, to much time to do for a paying customer. plus there other mods to intake side and alot of exhaust tunnel work. i what to have great buttom end with this set up. 158* closed exhaust to 192*exhaust open kips. stock kips around 165-168* to 182-185*exhaust. i'm up here in sled country and guys have custom cylinder that are 12 port. the kx 500 motor was designed around a bike frame and made for 4,000-6,000 rpm. i'm working on a cylinder now that will have alot of welding done to it.
kaw rider:
Not trying to get into an arguement over the subject, but as of that time nobody had ever questioned the large side mills on the pistons to the people that we delt with at Wiseco. I was told by "someone who should have known" that the Kawasiki guys didn't realize it at the time either. Once it was brought to their attention I am sure there could have been several reasons for it.....the pipe thing sounds as good as any I have heard, and better than I could have came up with....lol
Like I said, I am sure we didn't discover anything that other builders hadn't already noticed......maybe we just didn't keep our secrets as well as some others did
I have seen the same type of problem with a couple of the Snowmobile engines, (even seen one that opened their hook exhaust ports straight into the crankcase at TDC, with the cutaway under the wristpin), it seems to happen more in the first year or two that they would start using the auxilary exhaust ports.....and then they seem to change the designs.....
BDI:
The only thing I wonder is why people that want more bottom end dont just make the main exhaust port smaller I'm allways talking about the upside down triangle and there is good reasons that works real good for making good bottom end and you dont really have to make the port a lot smaller Its more or less the shape but thats more then I feal like typing about right now. Happy new year
doordie:
Playing with mspaint.....
1.Modified portshape and more portarea.
2.Modified portshape to avoid shortcircuing but need refilling with JB-weld and with little less portarea.
3.More portarea with lowered exhaust floor.
1+2+3=maybe more power without shortcircuing! 8-)
(Mike Melde have a similair portmap)
I have a barrel with sleeve and can test this mods later.
doordie:
--- Quote from: BDI on December 30, 2007, 05:14:13 AM ---
--- Quote from: doordie on December 29, 2007, 11:44:15 PM ---This is a easy mod to raise ccr... :-D
--- End quote ---
Hey doordie those are ceramic main bearings aren't they? very nice 8-)
--- End quote ---
Yes,but isn?t a KX500 engine.... :wink:
BUT soon will my engines runs with this hybrid ceramic bearings.....and a composit
rod from a Swedish company www.mxcomposites.com
Ceramicbearings from a another Swedish company www.vasatech.se
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