Joined Nov 2012
2K Posts | 821+
Iceland
I don't know about fitment, but you might also want to check out the Keihin CVK-40. The DR-Z400S and SM models have a 36mm Mikuni BSR carb. People have had very good results with swapping in a 40mm Keihin CVK - not only is the bore bigger but the carb itself is better designed as far as I've read. (These carbs come used off of KLR650's, $100+ on EBay.)
Joined May 2011
700 Posts | 3+
Wisconsin, U.S.
i have a mikuni tm40 pumper and i love it, i am not ther first on to do it so there is a little info out there
viewtopic.php?f=7&t=138
here is one of a bunch of threads with good info
viewtopic.php?f=7&t=138
here is one of a bunch of threads with good info
Joined Nov 2012
170 Posts | 0+
Transilvania
Well I think Im going to look for something else. I just realised that the BST 40 doesnt have an accelerator pump. So it wouldnt make much of a difference compared to the Delorto. 
(. I was jsut excited since the guy was asking 100 euros for it.
Tom
(. I was jsut excited since the guy was asking 100 euros for it. Tom
Joined Nov 2012
2K Posts | 821+
Iceland
OK, so in case this is useful - the CVK40 doesn't have a pump, it's a vacuum carb - BUT it responds well to having holes drilled in the slide. Very quick action. People are surprised by it. It's not an FCR, but close.
Here's a thread with the CVK40 mod for DR-Z's: http://www.thumpertalk.com/topic/277054 ... 0-convert/
Basically it's the carb, attachment hardware for the bike, a KLR jet kit from JD Jetting (to get a good needle), and drilling the vacuum hole in the slide to 3/16". Supposed to be doable for under $200 total.
Note however that "it would take roughly a 42-44 cv carb to flow what a 39mm fcr does" (from the thread above). Someone actually bored out his carb to 44/42.5mm (also in the thread, pg. 7).
And ... there is actually a CVK42 carb used on Harleys that is a vacuum carb but it does have an accelerator pump. Just to throw it out there. That would be more experimentation than I would enjoy doing myself, but info is info, yeah?
Here's a thread with the CVK40 mod for DR-Z's: http://www.thumpertalk.com/topic/277054 ... 0-convert/
Basically it's the carb, attachment hardware for the bike, a KLR jet kit from JD Jetting (to get a good needle), and drilling the vacuum hole in the slide to 3/16". Supposed to be doable for under $200 total.
Note however that "it would take roughly a 42-44 cv carb to flow what a 39mm fcr does" (from the thread above). Someone actually bored out his carb to 44/42.5mm (also in the thread, pg. 7).
And ... there is actually a CVK42 carb used on Harleys that is a vacuum carb but it does have an accelerator pump. Just to throw it out there. That would be more experimentation than I would enjoy doing myself, but info is info, yeah?
Joined Nov 2012
170 Posts | 0+
Transilvania
That sounds nice . The season is almost over and the bike is going to hibernate during the winter so I will have plenty of time to make my mind up on the best choice financially. If I wish to get a Keihin FCR, a 39 mm is not enough for a 650?
Tom
. The season is almost over and the bike is going to hibernate during the winter so I will have plenty of time to make my mind up on the best choice financially. If I wish to get a Keihin FCR, a 39 mm is not enough for a 650?Tom
Joined Nov 2012
2K Posts | 821+
Iceland
The DRZ tuners start going for the FCR-41 at 470cc and up, for the top-end, mostly in supermoto use - at that point the bike reaches 60rwhp - but is spinning quite a bit faster than the 650 so not sure how it translates. Afaik the 39 is fine in that context except for not reaching full potential at high rpm.
(I am NOT an expert btw, just try to read a lot.)
A quick search didn't reveal the FCR bore the later 650s use. I would 't be surprised if it were 41mm.
(I am NOT an expert btw, just try to read a lot.)
A quick search didn't reveal the FCR bore the later 650s use. I would 't be surprised if it were 41mm.
Joined Nov 2012
2K Posts | 821+
Iceland
Did you see this? FCR 39 for sale here, just popped up. http://husaberg.org/classifieds.php?act ... &ad_id=661
(That's CHEAP for an FCR.)
(That's CHEAP for an FCR.)
Similar threads
Register CTA
Register on Husaberg Forum! This sidebar will go away, and you will see fewer ads.
Sign Up
