Keihin MX FCR 39 on an 03 640 Adv?

overlandr · 03-09-2004, 06:19 AM

Hi

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

neduro · 03-09-2004, 10:12 AM

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.

Tim · 03-09-2004, 11:32 AM

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.

Flanny · 03-09-2004, 12:27 PM

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...

Mack · 03-11-2004, 07:53 PM

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.

03-09-2004, 06:19 AM	#1
overlandr ^OP Bend it Bend it Joined: Nov 2003 Location: Sydney Oddometer: 5,435	Keihin MX FCR 39 on an 03 640 Adv? Hi 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

03-09-2004, 10:12 AM	#2
neduro Tuareg 2013 Joined: Jul 2003 Location: Colorado Springs, CO Oddometer: 11,344	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. __________________ For Sale: FJ60, or Defender 90, 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.

03-09-2004, 11:32 AM	#3
Tim Beastly Adventurer Joined: Dec 2002 Location: Guernsey, Channel Islands, UK Oddometer: 2,291	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.

03-09-2004, 12:27 PM	#4
Flanny Flanny-it-up! Joined: Feb 2003 Location: Ottawa, Ontario, Canada, the World, the Universe Oddometer: 2,744	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 Flanny-it-up!...Check out the FlannyMedia Web Site and Blog at www.FlannyMedia.Com

03-11-2004, 07:53 PM	#5
Mack Gone, but never forgotten. RIP, Mack... 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. __________________ Ã–sterreichische MotorrÃ¤der und deutsche Autos. Wie wundervoll kann das Leben sein

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