Go Back   ADVrider > Bikes > Thumpers
User Name
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Thread Tools Search this Thread Display Modes
Old 03-09-2004, 06:19 AM   #1
overlandr OP
Joined: Nov 2003
Location: Sydney
Oddometer: 5,926
Keihin MX FCR 39 on an 03 640 Adv?


I am looking at getting hold of this carb from an 03 525EXC - cheap of course! The point is -

Has anyone else got this carb on the same bike?

Is fitment and set up going to be a hassle?

Do I need to get a loads of other parts to make it fit?

Will it greatly improve the mid end performance and economy ?

Is it generally suited to the engine - I see this carb is used in the 02 660 Rallye Engine

Where can I get Kehin parts - preferably in OZ?

Any information on this match would be good. Cheers People
overlandr is offline   Reply With Quote
Old 03-09-2004, 10:12 AM   #2
neduro's Avatar
Joined: Jul 2003
Location: Colorado Springs, CO
Oddometer: 12,052
I've got no direct experience with this conversion, but I know the FCR is a fantastic carb once tuned. The trick is, it's difficult to tune correctly, so I'd be wary if I wasn't ready to mess with it a bunch. Hopefully you're also comfortable with jetting and have have access to an EGR and a Dyno.

If you can get it dialed, though, I bet you'd really like it.
Doubletake Mirrors- Folding D/S mirror that is both useful and indestructible.

Dual Sport Riding Techniques DVDs: Clear instructional DVDs to improve off-road skills.
neduro is offline   Reply With Quote
Old 03-09-2004, 11:32 AM   #3
Beastly Adventurer
Tim's Avatar
Joined: Dec 2002
Location: Guernsey, Channel Islands, UK
Oddometer: 2,364
People seem to run FCR41s on 640s rather than the 39, but I would guess that you should be able to get it set up OK.

Try asking at KTMtalk, a guy called James Dean (made up name?!) seems to be very knowledgeable.
A good friend will come and bail you out of jail...but a true friend will be sitting next to you saying........."Damn..We F*cked Up" - Anon.
Tim is offline   Reply With Quote
Old 03-09-2004, 12:27 PM   #4
Flanny's Avatar
Joined: Feb 2003
Location: Ottawa, Ontario, Canada, the World, the Universe
Oddometer: 2,738
The 39mm should actually be better than the 41 on the 640 for the dirt...more low end response, while still have the "snap" of a pumper...

The 41 is more intended for supermoto due to the big top end gains...
Flanny is offline   Reply With Quote
Old 03-11-2004, 07:53 PM   #5
Gone, but never forgotten. RIP, Mack...
Mack's Avatar
Joined: Sep 2002
Location: Austin, Texas USA Native Oregonian
Oddometer: 3,797
Flanny, and group. As I'm getting ready to pull the trigger, and order a Keihin for my 640 ADV, if anyone has additional feedback it would be appreciated. In an ideal world, I'd have dyno charts to look over for a BST 40, TM40, FCR39, and FCR 41 equiped 640 ADV. I'm pretty commited to the FCR 41, as the bike will see just as many street miles as off road miles, and it seems the bottom end is strong enough as is, but more top end when riding with GS's, into headwinds, etc. is always a plus. Then again, the Rallye 660/700's certainly don't seem to be lacking in top end! Thanks, Mack

PS. It looks as if the kit isn't all that, with many complaining of throttle cables that don't work that well, and poor fitting carb adapters. I might just end up buying the carb, and using the RFS throttle cables, and intake boot. (Overlandr, if your getting all the above with the carb, at a good price, it sounds like it would be a pretty good deal.) I'm off to KTMtalk.
Österreichische Motorräder und deutsche Autos. Wie wundervoll kann das Leben sein
Mack is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Times are GMT -7.   It's 02:59 PM.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2015