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Discussion Starter · #1 ·
Hi,

I here have a 39mm carb, which to my opinion is from a 450/525EXC.
It doesn't have a hot start. The number on the side is 3900R...

I have however no clue from what year. Can someone tell me?
Also, what's the funtion of the pipe (to which a hose can be connected) on the side of the carb (see 2nd picture)?

Thanks!
Frank.




 

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That appears to be a 2006 (ish) Keihn FCR 39 carb.

The pipe is a vacuum port (best guess).
 

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Oke, thanks!

Maybe a stupid question, but what do you mean by 'ish'? :)
The changes from year to year are very subtle.
You would have to check the for a serial number stamped
on the casting to be 100%.

I did not see the red hot start button on your photos, so
it may or may not be the FCR-MX carbie.

Check out this site.

http://www.keihin-us.com/am/products/fcrmx.php
 

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Discussion Starter · #5 ·
The changes from year to year are very subtle.
You would have to check the for a serial number stamped
on the casting to be 100%.

I did not see the red hot start button on your photos, so
it may or may not be the FCR-MX carbie.

Check out this site.

http://www.keihin-us.com/am/products/fcrmx.php
That's right, it doesn't have a hot start.
The serial number goes like 3900R...
It did find info on the carbs which have 3900E... etc., but nothing about this one with 'R'.

I'll also check the Keihin site.

Thanks!
 

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Better late than never

Sorry for the delay but I just saw your question about which FCR carb you have.

I am sure from what you have there it is a 2008 FCR-MX 39 carb built for a Polaris 450S outlaw. Look it up on BikeBandit if you need a diagram of it and a part list. That carb listed for over $900.00 on bike bandit. Good carb.
 

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Discussion Starter · #7 ·
Sorry for the delay but I just saw your question about which FCR carb you have.

I am sure from what you have there it is a 2008 FCR-MX 39 carb built for a Polaris 450S outlaw. Look it up on BikeBandit if you need a diagram of it and a part list. That carb listed for over $900.00 on bike bandit. Good carb.
No problem, better late than never ;)

Thanks mate!
 

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Frank,

Did you get that carb from the guy on eBay in Michigan?
 

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Noss machine adapter

I don't know what bike your planning on putting your FCR-mx on but you may need to buy a carb adapter for your application to reach the airbox and I have used a company called Noss Machine which makes really nice FCR-MX adapters for any application you may have. The trx450 adapter seems to be the common choice for lots of applications. Mine is on a XR650L Honda. What the adapter does is extend the intake side of your carb to fit to an airbox or just a good mount for a filter of your choice...I like Uni the best. The adapter has a bit of a velocity stack for better flow and holes for the two slow jets you see at the intake. DO NOT buy the "bolt on" type adapters from Sudco because they won't work on your carb. Those have bolt holes on the adapter which are for the universal type Keihin carbs that Sudco sells...you need a "slip on" adapter that you will silicone or epoxy into place IF you need to/ It is an improvement from just the square rough intake but you'll see when you look at photos of your carb type at Noss machine... also you need to plug that open large brass fitting on the right side of the your intake which you probably knew...good luck...Just wondering where do you live? I am in sunny southern California. I get the feeling your in Australia???
 

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Could be, I got if from eBay back then.
You know him?
I was going to bid on one of his carbs, but found one local on craigslist.:D
 
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