86 carb and clutch experiences?

Reference and discussion for the various air-cooled KDX models

86 carb and clutch experiences?

Postby pkenney » 01:02 pm Feb 12 2018

Looking to improve the motor a bit on my 86.
It is stock, pretty fresh, and runs well but I don't feel it has the "tractor" factor I see on the newer bikes.
It has a good top-end hit but I have not been able to move any power to the bottom and don't really want to add a flywheel weight.

I'm using the 30 year old VM34 and looked into the RB mods but he does not offer anything for the Air Cooled KDX.
I have seen references to upgrading to the newer KDX Keihin but have not found much detail.
Anyone have first hand experience?

I've also been looking for a pipe but only find the DG available.
FMF tells me they don't have anything for the 86.
I also have seen some Hop-Up notes that say the stock pipe is fine.
Any feedback?

I'd also love to get a recommendation on a clutch kit.
Shopping the online stores, I have not been able to find a good clutch kit for the 86 but found that the KLX300 uses the same part number so I ordered an EBC kit.
Maybe it is my riding ability but it completely gives up on long hill climbs where a lot of clutch slipping is needed.
It comes all the way to the bars and takes a while to come back.
I use ATF but plan to switch to Maxima MTL-80 this year.

Thanks for any feedback,
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Re: 86 carb and clutch experiences?

Postby Jason » 03:37 pm Feb 12 2018

FMF pipe is definitely stronger than stock. DG may be your only choice for new and readily available.

1988 switched to Keihin PWK35 with the right side tab that reached over to the left to do the choke lever. It also has the air screw on the right and the idle knob on the right. Some have wedged it into the old boots and some have purchased the 1988 carb to engine and airbox to carb boots.

Not sure on the clutch kit.

I have been using Maxima 80 for a few years, works great for me.
Thank you, Julien D for all your hard work!

PLEASE! Do not "dip" PWK Keihin carbs in Berryman's to clean them! It will damage the internal o-ring (jet block gasket).
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Re: 86 carb and clutch experiences?

Postby doctord23 » 03:39 pm Feb 12 2018

88 model year had the Keihin carb so you can get the reed and air cleaner boots from that year.
Then you can use a Keihin carb off of a newer kdx, but it's tight to get to the choke lever from the left side.

I like what you did with the rear disc setup. What year brake parts did you use?
I had done a conversion with an 80's kx on an 87 that I used to have.
It makes a huge difference to have discs front and rear.

I just finished putting an 88 back together.
My Team Green:
2002 KX-KDX 220
2000 KDX 220
2003 KLX 300 DS
1988 White KDX 200C3
1984 KX500 (original owner)
1996 Honda Magna V4
2017 Honda Africa Twin DCT
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Re: 86 carb and clutch experiences?

Postby pkenney » 04:03 pm Feb 12 2018

I used 2002 KX125 Forks, wheels, and brakes and they were a huge improvement.

Converting the rear wasn't that bad but I had to machine a caliper stay that I bolted around the stock swingarm boss.
Also had to fab and weld the master cylinder holder to the frame which took some trial and error to get the angle right.
The sprocket side worked with the stock KDX axle spacer but the brake side needed an additional spacer with the KX caliper.

Thanks for the carb recommendations, I'm disappointed that RB doesn't have anything he'd recommend.
A carb is a carb right? I'd have liked to try his mods based on what I know about them.
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Re: 86 carb and clutch experiences?

Postby doctord23 » 08:00 pm Feb 12 2018

The air cooled C years are quite peppy on the top end.
I few things could be hurting the low end including ignition timing and kips timing.
My Team Green:
2002 KX-KDX 220
2000 KDX 220
2003 KLX 300 DS
1988 White KDX 200C3
1984 KX500 (original owner)
1996 Honda Magna V4
2017 Honda Africa Twin DCT
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Re: 86 carb and clutch experiences?

Postby pkenney » 09:52 pm Feb 12 2018

I've tried the ignition timing and didn't see much difference but have not really messed with the KIPS system.
I have verified that it opens at higher revs and the timing dots lined up at 11:00 with the rod all the way in.
I also read about a KIPS chamber spacer and it seems like a 10mm spacer is beneficial.

My carb isn't in the greatest shape and there is an odd needle in it so I want to be sure I get that system right.
I'm going to look for some 88 components and a fresh carb.

Thanks for all the suggestions,
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Re: 86 carb and clutch experiences?

Postby targetman » 03:38 am May 19 2018

Have you found an '88 carburetor yet?
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