Maintenance & Technical > KX500 Original

1987 KX 500 rebuild time + parts interchange question

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sandblaster:
If your kips are locked open you will loose the smooth transition of your power delivery.
The engine will roll on then suddenly hit faster with power which is fine for drag racing or hill climbing, but not so good for much of anything else.
Boyesen's are good for making power lower in the RPM range whereas the V-Force reeds make power up higher in the rpm range.
I've never ran the round slide on a 500 so I have no comment there but there should be a few on this site with that experience.

-Wossner 86.50mm bore piston kit  - Good
-Wossner or OEM connecting rod kit  - Good - get your crank balanced..
-Cometic gasket kit  - Good
-All balls cranks kit  - can't comment on that, I use OEM or comparable German, British, US, Japanese, Swiss, no Chinese bearings
-Boyseen Rad valve - Boyesen's are good for making power lower in the RPM range whereas the V-Force reeds make power up higher in the rpm range.
So that depends on what you are wanting the engine to do, which pipe, ect.

Mike Grant:
The Boyseen rad valve sounds like the ticket for me. I will be using the bottom to mid range power alot more then top end on the local tracks and trails I ride. My bike already has a Pro Circuit pipe with an FMF silencer so I hope the parts setup works together. My next big problem I am running into is finding a good pair of KIPS valves which looks like it is going to be a major pain in the ass.......any onr have a set they want to sell  :-D

Goat:
It's been a long time since I've ran the round slide carb but the Keihin PWK is an excellent carb and easy to tune. If you can find one cheap I say go for it but I don't think it's a justifiable purchase if it's more than $80 shipped. I paid something in the $50 range for mine to replace the Keihin PJ carb that came on my 87 that couldn't hold a tune or even keep an idle. The PJ has been a paperweight for 3 years now :P

I'm not sure about the rad valve as I have never used one but your pipe and silencer combo work good together. I had that setup on my 98 and tried it out on my 87 before I built the pipe I'm running now with a PC silencer. I run mostly track with some short runs through the trails.

motopunk:

--- Quote from: Mike Grant on September 21, 2014, 04:35:50 PM ---I have been checking out as many threads as I can to try and figure out what the most reliable and proven parts are so I don't end up regretting any of my purchases. I came across something interesting last night when I was looking for kips valves. Check out this link and look at the KIPS removal they did on the engine


http://rpmmfg.com/1987KX600BBSS.aspx

-I know it would be ideal to keep the KIPS working but considering this is an 87 engine without the center KIPS valve which alters exhaust port timing and volume. Would I be missing out on much power?

-I was also wanting top purchase the Boyseen Rad valve because it cures the intake manifold cracking problem for good. I needed a new set of reeds anyways so this combined with a new intake boot puts me within $50 of a  Rad valve + a  bit of extra power to boot

-Also curious if purchasing a 39mm pwk is going to be worth the money compared to the stock round slide......sure looks alot better

So here's where I have my parts list right now.....hoping to order on tuesday

-Wossner 86.50mm bore piston kit
-Wossner or OEM connecting rod kit
-Cometic gasket kit
-All balls cranks kit
-Boyseen Rad valve


--- End quote ---


the 86-88 engines with the 2-valve-kips are a powerhouse ... the newer 3-parts kips 89-2004 makes a little bit smoother power delivery from down low but the peak power is nearly the same like the 86-88 ... ;)

conrod kits , crank bearings/seals and piston fit from 83-2004 ... i have on my 86 and 88 engine hotrod-conrod-kits , allballs bearing and seal kit and wössner 2-ring-pistons installed and i run it with 1:40 motul 800 premix oil ...

intake manifold is the same from 87-2004 you can get a new one at any kx-dealer... ;O)

yeomans:
Mike, I can sort you out with some kips valves or if you only need the one for the left side. :-D
Is it steel or aluminum valves in the head right now ? I've got a few to choose from.

I Just put that wossner rod in my 86

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