3/16 " Intake Spacer

Discussion specific to the 1995 - 2006 KDX200 (H Series) and 1995 - 2005 KDX220R (A Series) models sold in the USA
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C George
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3/16 " Intake Spacer

Post by C George »

Here's something I made over the weekend. I'm no machinist ,so I improvised with a jig saw , bench grinder and some filing.
This is going between the read cage and the cylinder. The theory is more low end torque.

Image
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3/16 " Intake Spacer

Post by MCKDX220 »

Not bad, let us know how it works out !!!

Michael
87 KDX200 / 02 KTM 520 EX/C / 87 XR 200 / 90 XR 200
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C George
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Re: 3/16 " Intake Spacer

Post by C George »

Installed

Image
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Re: 3/16 " Intake Spacer

Post by MCKDX220 »

Dude, you are just teasing me, you probably won't ride for another 8 weeks to find out how it works out.

Was putting the carb back in a PITA, or not so much ???

Michael
87 KDX200 / 02 KTM 520 EX/C / 87 XR 200 / 90 XR 200
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Re: 3/16 " Intake Spacer

Post by Joshmcmillan »

Will be interesting to hear how it works!
07' CR450X (Main Bike)
07' KX125 (Completed basket case rebuild, for sale)
88' KDX200 (Not sure yet, runs but with rattly top end)
91' CBR250RR
Old Bikes: 97' KDX200, 00' RM125, 85' XR350, 94' KDX200, 02' CR80, 82' XT250, 98' CT200
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3/16 " Intake Spacer

Post by Gotanubike »

More low end torque from further fuel travel?

I can see how the expansion chamber mod would work, but nowhere in the fuel travel to the cylinder are there any variabile effects for combustion :hmm:
1990 KDX200
Bike Profile -> http://www.kdxrider.net/forums/viewtopi ... 61#p136315
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C George
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Re: 3/16 " Intake Spacer

Post by C George »

It's more a factor of Intake volume after the reeds close than it is fuel travel.
The carb fit's fine.
The Moose ones that are twice as thick " 10mm" might be a bear to fit.

XX - Plus I noticed when porting the intake that the stock cage depth slightly blocked
the rear cylinder boost port. Moving it back just 5mm / 3/16" helped that issue.

Yes , eight weeks at least , but that gives me time to grease all the wheel and suspension
bearings. :grin:
Last edited by C George on 09:10 am May 18 2014, edited 1 time in total.
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Re: 3/16 " Intake Spacer

Post by kdxoldrob »

i wanna know if this works also. i could make that..lol. in a car, the longer the intake runner the more torque it makes. didnt know if that applies to a 2 stroke? keep us posted
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Re: 3/16 " Intake Spacer

Post by C George »

The moose ones have some very good reviews . Also the V-force 3 reed cage has some good reviews and
it's mounting plate is twice as thick as the stock cage. I feel that many other people smarter than me have
proven that it helps the torque factor.

If you were running a 13,000 rpm 125 shifter cart , you'd want the intake as short as possible.
Last edited by C George on 07:30 am Mar 23 2014, edited 1 time in total.
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Re: 3/16 " Intake Spacer

Post by kdxoldrob »

cool. i was debating the v force 3 and the rad valve. i have heard mixed reviews about performance? i have been reading all the threads i can before i dive in..lol
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Re: 3/16 " Intake Spacer

Post by C George »

You really can't go any thicker than 3/16 / 5mm on a KDX as the throttle cable out the top of the carb is barely clearing the frame.
Last edited by C George on 09:11 am May 18 2014, edited 1 time in total.
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3/16 " Intake Spacer

Post by Gotanubike »

Somthing I just noticed here, on the new reed cage I bought to replace my melted one last year. It has a bigger spacer block compared to my old one...Anyone know why these looks different? It came off an E-series 1992 bike according to the ebay seller..Mine is a 89/90

Image
Last edited by Gotanubike on 12:16 pm Sep 24 2015, edited 2 times in total.
1990 KDX200
Bike Profile -> http://www.kdxrider.net/forums/viewtopi ... 61#p136315
Suspension Overhaul(Shock+89-92 conventional forks) -> http://www.kdxrider.net/forums/viewtopi ... 15&t=15255
96'-98' RM125 Showa 49mm fork swap -> http://www.kdxrider.net/forums/viewtopi ... 04&t=16994
KDXrider world map! -> https://www.zeemaps.com/map?group=186158
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Re: 3/16 " Intake Spacer

Post by Joshmcmillan »

Image isn't working. Says "you are not authorised to view this image"
07' CR450X (Main Bike)
07' KX125 (Completed basket case rebuild, for sale)
88' KDX200 (Not sure yet, runs but with rattly top end)
91' CBR250RR
Old Bikes: 97' KDX200, 00' RM125, 85' XR350, 94' KDX200, 02' CR80, 82' XT250, 98' CT200
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Re: 3/16 " Intake Spacer

Post by Gotanubike »

Oh I forgot to click submit...I got the link from the thumbnail beforyou click submit. Fixed
1990 KDX200
Bike Profile -> http://www.kdxrider.net/forums/viewtopi ... 61#p136315
Suspension Overhaul(Shock+89-92 conventional forks) -> http://www.kdxrider.net/forums/viewtopi ... 15&t=15255
96'-98' RM125 Showa 49mm fork swap -> http://www.kdxrider.net/forums/viewtopi ... 04&t=16994
KDXrider world map! -> https://www.zeemaps.com/map?group=186158
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3/16 " Intake Spacer

Post by 6 Riders »

Gotanubike wrote:Somthing I just noticed here, on the newisher reed cage I bought to replace my melted one last year. It has a bigger spacer block compared to my old one...Anyone know why these looks different? It came off an E-series 1992 bike according to the ebay seller..Mine is a 89/90

Image
Can't see the image, but.....I have a Boysen cage in my 94 and it is quite a bit thicker than a stock cage.
newbbewb wrote:^what he said.
masterblaster wrote:Man 6 riders you rock.
*side note...I'm drunk, so try to read what I'm trying to say, instead of what I actually type
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3/16 " Intake Spacer

Post by Gotanubike »

Somethin went all funky with the gallery images and my album contents made their own page somewhere...

This one work? If not I'll just use photobucket

Image

The cage itself is smaller to compensate for the larger spacer...They are the same height so I guess the thicker spacer wouldn't have an effect.
1990 KDX200
Bike Profile -> http://www.kdxrider.net/forums/viewtopi ... 61#p136315
Suspension Overhaul(Shock+89-92 conventional forks) -> http://www.kdxrider.net/forums/viewtopi ... 15&t=15255
96'-98' RM125 Showa 49mm fork swap -> http://www.kdxrider.net/forums/viewtopi ... 04&t=16994
KDXrider world map! -> https://www.zeemaps.com/map?group=186158
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C George
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3/16 " Intake Spacer

Post by C George »

C George wrote:Here's something I made over the weekend. I'm no machinist ,so I improvised with a jig saw , bench grinder and some filing.
This is going between the read cage and the cylinder. The theory is more low end torque.

Image

I hope to have the bike back together and out of the basement in a few weeks. :grin: :grin:
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🤟🤟
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Re: 3/16 " Intake Spacer

Post by KDXGarage »

Gotanubike, the one on the right may be an FMF brand cage.

Look up FMF Ram or something like that.
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3/16 " Intake Spacer

Post by Gotanubike »

That's a nice bonus...

Are the reeds themselves still available? They appear to be a different size from stock
1990 KDX200
Bike Profile -> http://www.kdxrider.net/forums/viewtopi ... 61#p136315
Suspension Overhaul(Shock+89-92 conventional forks) -> http://www.kdxrider.net/forums/viewtopi ... 15&t=15255
96'-98' RM125 Showa 49mm fork swap -> http://www.kdxrider.net/forums/viewtopi ... 04&t=16994
KDXrider world map! -> https://www.zeemaps.com/map?group=186158
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Re: 3/16 " Intake Spacer

Post by KDXGarage »

I am not sure on the reeds. Contact fmfracing.com to see
Thank you for participating on kdxrider.net. :bravo:
To post pictures from a device: viewtopic.php?f=88&t=24128
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