KX Riders
Maintenance & Technical => KX500 Original => Topic started by: Tim short on February 13, 2016, 04:53:27 AM
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I was just curious about other member that have bored their kx500
How much and did you have to do any mods to the head ?
I am forced to over bore because of slight cylinder damage i was thinking a .20 or .40 over ? thought?
thanks
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I believe once you get to 88mm on the bore, you need to modify the head, but don't hold me on that. I'm at 88.5mm(535cc), and I believe I was told once you get to 88mm it needs to be done....but I also needed to have my center exhaust valve modified to accept the larger bore, as will at 88mm, otherwise catastrophe would result.
If you're really serious about going that much bigger...I strongly suggest Todd Pinnsonault...he did mine, and he's done several other members as well.
you can contact him here....
http://www.kxriders.com/forums/index.php?action=profile;u=1767
http://www.kxriders.com/forums/index.php/topic,10028.0.html
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another thing to consider if it's in your budget....is having the crank balanced/trued...this really makes a huge difference when you start going bigger on the bore size, because these things will vibrate themselves to death, and put your arms to sleep otherwise!...and Pinnsonault can and will do that too....worth every cent if you can afford it!!
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91mm bore on my bike.
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I "sleeved" mine out to about 530cc and really regretted it. It never made as much power as the standard one and noticibly loses power as it gets hot. I'm putting mine back to standard as a result - worth the extra expense of getting a cylinder re-plated in my opinion. :-)
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My bike is at 88 mm, which was done when Millennium Technologies re-sleeved my cylinder. They put in a LA sleeve and then bored it to 88 mm to fit the Wossner piston I already had. I purchased my running 1988 engine off eBay, and it came with a cylinder that was sleeved with a 1989 and up sleeve and had no KIPS valves at all. I purchased another head with KIPS valves and it was already sleeved and bored to 88 mm, but it was worn out. I only rode the stock bore 1988/1989 sleeve head a little bit before redoing he engine, and I don't remember a ton of difference in vibration between the stock bore head and the 88 mm head. My bottom end was done when I bought the motor off eBay, and it looks to be welded and balanced, so I may not be the best person to comment on vibration. When the carb is set up correctly, it really rips.
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... worth the extra expense of getting a cylinder re-plated in my opinion. 8>)
Yup, stock bore & re-plate recently on the last conventional fork '89 :evil:
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I "sleeved" mine out to about 530cc and really regretted it. It never made as much power as the standard one and noticibly loses power as it gets hot. I'm putting mine back to standard as a result - worth the extra expense of getting a cylinder re-plated in my opinion. :-)
who did the work?
mine's not sleeved...and makes considerably more power than the standard squared motor, with the way I had Pinnsonault set it up.
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91mm bore on my bike.
Mmmmmm.... Special :-P
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Thanks for the responses
do i need to do anything to the head if i put a 87mm piston in ?
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Thanks for the responses
do i need to do anything to the head if i put a 87mm piston in ?
you're good....once you get to 88mm, then the head needs to be modified.
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91mm bore on my bike.
Mmmmmm.... Special :-P
But it's just stock... Just ask all the guys I raced this weekend.... That's what I told them.... Muahahaha
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Okay cool thanks for the reply i guess ill get an 87 then, this project seems like it will be lengthy, i just painted the frame and am ordering the piston, then ill send it out to get bored, then i will have to figure out my power valve crisis and the lacking front brake, But by the time its done it should ride really nice and ill have a piece of mind knowing everything thats needed fixing has gotten it.
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Okay cool thanks for the reply i guess ill get an 87 then, this project seems like it will be lengthy, i just painted the frame and am ordering the piston, then ill send it out to get bored, then i will have to figure out my power valve crisis and the lacking front brake, But by the time its done it should ride really nice and ill have a piece of mind knowing everything thats needed fixing has gotten it.
post some pics when you get some time! :-)
"how-to"...
http://www.kxriders.com/forums/index.php/topic,10040.0.html
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[img]http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpsjr6kkily.jpeg/img]
[img]http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zps3qvbo4ca.jpeg/img]
[img]http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpswvtzyn4h.jpeg/img]
shes not much right now but i can say she's 100% mine :0
The real kicker for me is i ordered a 86mm piston just find find out i wasted my time and needs to get bored out (sorry about the whining, you could say i have dirt bike fever, i only got this last month and have ridden it a handful of times )
Im looking forward to riding it at mx338(southwick ma) this spring
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[imghttp://(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpswvtzyn4h.jpeg) (http://s1039.photobucket.com/user/Kx500er/media/Mobile%20Uploads/image_zpswvtzyn4h.jpeg.html)[/img]
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[imghttp://(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpsjr6kkily.jpeg) (http://s1039.photobucket.com/user/Kx500er/media/Mobile%20Uploads/image_zpsjr6kkily.jpeg.html)[/img]
(http://[URL=http://s1039.photobucket.com/user/Kx500er/media/Mobile%20Uploads/image_zpsjr6kkily.jpeg.html][img width=360 height=480]http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpsjr6kkily.jpeg)[/URL]/img]
(http://[/img[URL=http://s1039.photobucket.com/user/Kx500er/media/Mobile%20Uploads/image_zps3qvbo4ca.jpeg.html][IMG]http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zps3qvbo4ca.jpeg)[/URL]
[imghttp://(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zps57jpkiuj.png) (http://s1039.photobucket.com/user/Kx500er/media/Mobile%20Uploads/image_zps57jpkiuj.png.html)[/img]
sorry i used the direct link in the previous post ... still say even after the photo adding walkthrough
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that's alright, you got em posted.
that thing's pretty clean!...nice :-)
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I was expecting it to be worse for an 87 but its not awful besides the plastics(no biggie can get all from ufo) just little things like a top end chain guide tires and a little tic. The tranny should be good it has a 14 42 combo so i doubt the previous owner ever got it out of 2nd.
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I was expecting it to be worse for an 87 but its not awful besides the plastics(no biggie can get all from ufo) just little things like a top end chain guide tires and a little tic. The tranny should be good it has a 14 42 combo so i doubt the previous owner ever got it out of 2nd.
Don't be too sure, I use a 15/42 :-D
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Haha okay sandblaster :-D sorry I'm just used to a 13 50 setup i had last, i mean a 15 42 is really fast.
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I am painting the swing arm tonight using rustoleum textured i will post a pic later after an hour or two
I will soon order the piston and linkage bearings for the rear shock progress is moving slowly
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nothing wrong with slow and steady progress.
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(http://[URL=http://s1039.photobucket.com/user/Kx500er/media/Mobile%20Uploads/image_zpsqcjwcnpu.jpeg.html][IMG]http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpsqcjwcnpu.jpeg)[/URL][/img]
(http://[URL=http://s1039.photobucket.com/user/Kx500er/media/Mobile%20Uploads/image_zps9zgbww4g.jpeg.html][IMG]http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zps9zgbww4g.jpeg)[/URL][/img]
came out pretty good how ever i ran out of the paint (rustoleum textured gray) so ill pick some more up tomorrow to finish the other side of the swing arm. SO far i like the finish of the paint it looks good, much better than how the swing arm used to look see previous photos.
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(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpsirjiucma.jpeg)
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Thoughts on this color for the engine i dig it myself :mrgreen:
(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpsyqbk80rm.jpeg)
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Swing arm painted using hammered rustoleum looks pretty good!
(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpsqcjwcnpu.jpeg)
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I will probably paint the sub frame tonight because i love making her look all shiny :lol :-D
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lookin good!
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Foxx4beaver thanks ! its coming along
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keep the progress pics coming! :mrgreen:
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I'm lurking :-o
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Swing arm came out good i put a couple stickers on and im loving the look
(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpsenqqdopn.jpeg)
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Another one of the other side
(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpslrk90evs.jpeg)
I will be gettig new swing arm bearings hopefully this week and the engine should be getting bored in probaly a week and a half when i get the new 87 mm piston
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that did come out nice!...what was the actual color you used?
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The color is rustoleum hammered its the gray color i couldnt find a "name" for the color
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That did turn out very good looking
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Thanks very much guys i agree completely , the hammered was advertised as a paint that masks imperfections , it didid okay and the paint went on very flat , i hit it with clear afterwards for extra protection
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cool...should look great once it's back on the bike.
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Just found 87 powervalves the build is saved :mrgreen:
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where'd ya find em?
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Did you find a set on eBay, or did you misplace them?
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i had a broken pair of valves that were pulled i found new ones on eBay for 300 pretty pricey but its worth it i hope
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yeah, it's pricey, but I would've paid that too...just for the sole fact of how hard they are to find now-a-days.
were they in the U.S.?...or were they in the Netherlands, or Sweden...or elsewhere over seas?
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Foxxx4 beaver in cali usa i just checked he has another set on for 300 if your interested maybe he is a new seller of parts ?
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cool...
I don't need a set, but thanks for the heads up on the guy having more for sale :-)....maybe someone else on here can snatch em up.
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I cant wait for it to be back together this warm weather is teasing me up in Massachusetts
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were in Mass?
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Granville ma roughly 25ish miles west of springfield and about 8 miles west of the famous 338 sand track :evil:
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cool...you should recognize my avatar pic then. :wink:
I'm at Southwick a few times a year.
I'm in Plymouth...a.k.a...America's Hometown.
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:-D awesome man thats quite a haul for a sand track
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about 2 hours doing 80mph...not too bad.
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I guess thats do able, southwick is fun but bumpy after the first lap
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(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpsztxaztlf.jpeg)
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(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zps3gmnqecg.jpeg)
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(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zpspjwyopsk.jpeg)
some pics of the new machine power valves for 87-88 i got off eBay they look to be built better than the kawi one so thats a plus
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they look nice. 8-)
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They sure do thanks
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(http://i1039.photobucket.com/albums/a478/Kx500er/Mobile%20Uploads/image_zps4vegctpn.jpeg)
The new piston and gaskets also a swing arm bearing kit
I will also be retro fitting a kx250 06-08 chain guide on it ill post a pic of the process when i do it
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nice!...shiny new parts, like X-mass time!
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Yes sir it sure does feel that way now it feels like xmas eve waiting for the bike to go back together
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Finally got her back together took it to stick today for the open and looped her out and got a face full of dirt but i didn't damage the bike, it runs so much better than before
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awesome!...I mean about the getting it back together part, not taking a "dirt nap". :-)
post some pics of it completed!
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I will do maybe even a youtube video :-)
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(http://i1039.photobucket.com/albums/a478/Kx500er/IMG_1997_zpsrcfhc5tw.jpg)
(http://i1039.photobucket.com/albums/a478/Kx500er/IMG_1998_zps0wuv04pu.jpg)
Here she is the almighty haha
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f'n right!...looks good.
did you get that snow today?...we got about 4" here this morning, and supposed to get more tomorrow.
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(http://vid1039.photobucket.com/albums/a478/Kx500er/MVI_2004_zpsjcrtvybj.mp4)
video :)
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http://vid1039.photobucket.com/albums/a478/Kx500er/MVI_2004_zpsjcrtvybj.mp4 go to this link for a short vid and my file share
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yes sir the snow is from today i couldnt believe it :-D
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sounds good. :mrgreen: