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FCR adapter...

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So, where can i get 1 of these, i dont have the carb yet (mate is slow as hell getting to the post office!!) and i want to be able to fit it right away and start jetting. Are there any dimensions you guys can give me to make 1 or? :p

thanks!

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Nobody that I know of has used an FCR on the 95 and earlier models. I think somebody tried and it didn't fit, although MX-Rob mentioned that the KTM version is a bit smaller.

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how do you mean it didnt fit? part of the frame in the way?

The starter motor occupies the space where the FCR float bowl would like to be.

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so does anyone know if the outside diameter of the 37 is the same as the 39? (airbox side)

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"As I understand it, the FCR-MX uses the same initial casting for the 37, 39 and 41 mm carbs so the overall dimensions are identical, including the outside of the intake bell and the carb spigot mount. The difference is that the 37 mm has a larger lip on the top surface of the intake that reduces the inside diameter and chokes it off to "around" 37 mm. So, the only practical difference between the 37mm and the 39mm is well after 3/4 throttle opening is achieved. They are the same carb through almost all of the slide's opening."

so the external diameter of the airbox side should be the same across models, meaning that i can get an engineer to make an adapter using measurements found on!!

http://home.comcast.net/~rshafer9/FCR_Install.htm

am i right?

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I wouldn't get anything made until you have the carb in your hands. The FCR is made in several configurations and could easily differ in important details. MX Robs setup is directed at the FCR-MX carb sold as an OEM part for the Yamaha YFZ450 quad. OEM FCRs are different that the 'racing' aftermarket versions. OEM carbs from different applications will not be identical. And then there are the standard FCRs and the FCR-MX versions.

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Buy your carb first. If it has a removable intake bell adapter you can buy an adapter of the correct length from Sudco or one of the other carb part houses. If it uses the intake boot as an adapter and has a flat edge at the carb opening, you can use the Noss Machine adapter. You won't know what you need until you have the carb in hand.

Personally, I had good results using a take-off from a '05+ YZ250F / WR250F and the Noss Machine adapter. You will have to turn down the Noss adapter slightly to fit in the airboot.

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if you havent been reading the other fcr posts..............i have a 94 and i made an adapter to mount the fcr. works perfectly. the only issue is you cant put the cover on the cable control side. doesnt bother me cuz the stock carb has exposed cables too. also i did not mount my airbox but there should be plenty of room to do so without any special adapters like the 96 and up models. heres pics of the adapter i made

<a href="http://s342.photobucket.com/albums/o418/princessamber5/?action=view&current=100_1156.jpg" target="_blank"><img src="http://i342.photobucket.com/albums/o418/princessamber5/100_1156.jpg" border="0" alt="Photobucket"></a>

<a href="http://s342.photobucket.com/albums/o418/princessamber5/?action=view&current=100_1155.jpg" target="_blank"><img src="http://i342.photobucket.com/albums/o418/princessamber5/100_1155.jpg" border="0" alt="Photobucket"></a>

<a href="http://s342.photobucket.com/albums/o418/princessamber5/?action=view&current=100_1157.jpg" target="_blank"><img src="http://i342.photobucket.com/albums/o418/princessamber5/100_1157.jpg" border="0" alt="Photobucket"></a>

<a href="http://s342.photobucket.com/albums/o418/princessamber5/?action=view&current=100_1160.jpg" target="_blank"><img src="http://i342.photobucket.com/albums/o418/princessamber5/100_1160.jpg" border="0" alt="Photobucket"></a>

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the carb is off an 04 yfz450 i installed the push cable as per mxrob but im not doing the vacuum port. i will install a raptor petcock. in other posts it is mentioned that a wr400 petcock will fit but it does not fit a stock tank. the lever will not go to reserve. probably will work on a plastic tank with no flange from the manufacturing process.

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I wouldn't get anything made until you have the carb in your hands. The FCR is made in several configurations and could easily differ in important details. MX Robs setup is directed at the FCR-MX carb sold as an OEM part for the Yamaha YFZ450 quad. OEM FCRs are different that the 'racing' aftermarket versions. OEM carbs from different applications will not be identical. And then there are the standard FCRs and the FCR-MX versions.

+1 It seems all the OEM FCR's have the same size intake bell OD. 54.5mm minus the lip for the OEM air boot. The new KTM FCR's have the same bell size as the YFZ450 carb.

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the carb is off an 04 yfz450 i installed the push cable as per mxrob but im not doing the vacuum port. i will install a raptor petcock. in other posts it is mentioned that a wr400 petcock will fit but it does not fit a stock tank. the lever will not go to reserve. probably will work on a plastic tank with no flange from the manufacturing process.

Nice shoe-horn job there. :) There ain't much room that's for sure.

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thanks. i probably could gain some space for the cover for the throttle cables if i cut the spacer down just a bit, but as it is i can change the main jet with the carb installed so i think ill leave it for now. i guess you might need the adapter for the airbox, i didnt try and fit the airbox boot to the carb since i wasnt installing it. the ID of the airbox boot for these model years is 57mm

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