Ducati Monster Forum

Moto Board => Tech => Topic started by: ducatiz on January 28, 2010, 04:48:36 AM

Title: Why not Mikuni TDMR vs Keihin FCR?
Post by: ducatiz on January 28, 2010, 04:48:36 AM
the Mikuni TDMR is a flat slide carb with identical (?) performance characteristics to the Keihin.

Has anyone tried it or have a reason not to use it?
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: Speeddog on January 28, 2010, 08:07:14 AM
They look good, and I've used sidedraft flatslide Mikunis on other engines and they work fine.

Seem pricey:
http://www.kedo.com/base_com/32294.html (http://www.kedo.com/base_com/32294.html)

Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: brad black on January 29, 2010, 03:40:17 PM
price is a real issue, but the main thing is people want to buy what's been done before.  how many people have fitted mikunis that you know off?  how many have fitted fcr?  that's the difference.  they'd need to be significantly cheaper to get into the fcr market, no matter how good they are.
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: ducatiz on January 29, 2010, 05:00:29 PM
thanks for the input.  i wonder why mikuni doesn't price them better to siphon off the FCR base...   [bang]
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: 2001cromo on January 30, 2010, 09:12:24 AM
I read somehwere recently that the Mukini's had the ability to fit a TPS and the Keihen's didn't.
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: ducatiz on January 30, 2010, 09:40:52 AM
Quote from: 2001cromo on January 30, 2010, 09:12:24 AM
I read somehwere recently that the Mukini's had the ability to fit a TPS and the Keihen's didn't.

they both do.  See the electronic ignition thread about the TCIP4 module.  I figured out another version of the FCRs which comes with the boss for a TPS
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: krista on February 04, 2010, 07:52:55 PM
I've been told Mikunis have incredibly stiff throttle springs and are more elusive to tune. When people I look up to tell me not to waste my time, I don't argue...
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: ducatiz on February 05, 2010, 03:59:44 AM
Quote from: chris on February 04, 2010, 07:52:55 PM
I've been told Mikunis have incredibly stiff throttle springs and are more elusive to tune. When people I look up to tell me not to waste my time, I don't argue...

sounds good too me, plus they list for about 10-20% more..   i just wonder who uses them?
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: ducpainter on February 05, 2010, 04:24:54 AM
Quote from: ducatiz on February 05, 2010, 03:59:44 AM
sounds good too me, plus they list for about 10-20% more..   i just wonder who uses them?
People who believe that FCRs have flimsy springs and are difficult to tune. ;)
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: greenmonster on February 12, 2010, 04:03:09 AM
Quotei just wonder who uses them?

Quite a few on the german Monster Forum.
I think they appreciate the choke function.
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: ducatiz on February 12, 2010, 05:18:09 AM
Quote from: greenmonster on February 12, 2010, 04:03:09 AM
Quite a few on the german Monster Forum.
I think they appreciate the choke function.

is that a sarcastic comment?   ;)
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: greenmonster on February 12, 2010, 01:20:39 PM
Just a tad. ;)
Think Mikunis are quite common & many are more used to them and more Mikuni dealers.
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: LA on February 12, 2010, 01:29:37 PM
Why don't peep's use Dellortos on Ducs?

They are Italian ........ aren't they?

LA
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: Speeddog on February 12, 2010, 02:27:24 PM
Quote from: LA on February 12, 2010, 01:29:37 PM
Why don't peep's use Dellortos on Ducs?

They are Italian ........ aren't they?

LA

Old Ducs run Dellortos.

They don't/didn't make a downdraft AFAIK.
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: brad black on February 13, 2010, 01:48:31 AM
and they have a heavy return spring and aren't as nice to deal with.
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: krista on February 13, 2010, 12:14:21 PM
Quote from: greenmonster on February 12, 2010, 04:03:09 AM
Quite a few on the german Monster Forum.
I think they appreciate the choke function.

If pumping the throttle once or twice didn't work for the FCRs, people might care more...
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: junior varsity on February 16, 2010, 03:47:03 PM
I've only ever seen the Mikuni's sold on Kaemna.de (as far as sites that sell goodies go that I care to troll regularly). None of the major US-targeted web vendors offer these. FCRs, on the other hand, are offered on several of the sites, namely ck's and motowheels.

It seems from my reading that the advantages of the Mikuni flatslides over the Keihin flatslides is not enough to warrant the additional cost when you factor in the availability and widespread knowledge related to FCRs. Just not worth switching over, so it seems.
Title: Re: Why not Mikuni TDMR vs Keihin FCR?
Post by: Rock Store on February 24, 2010, 11:24:57 AM
The PHM,s & PHF's are of the taper needle type carburetor with concentric central float chambers & have a horizontalmain barrel & can be mounted up to a maximum inclination of 40 degrees from the horizontal,this is even more evident with the front horizontal cylinder ,useing the Malossi short manifolds,the rear is straight up with the maslossi manifold.the springs for the slide come in 3 different weights from 1.4kg -0.7 coupled with the Ducati Tommaselli, daytona type 1/4 throttle makes things quite liter & smoother.
I have an NOS Malossi Dellorto kit onec carried by Ducati Performance for the belt drive SS's Malossi boots,Manifolds ,short ones,& alloy meshed turned bell mouths,t throttle cables,& moret,heir 40mm PHM,pumpers,these also were offered at the time  in 41-42 1/2 mm.they were expensive and still are,The FCR is a superior Carb no doubt for its flat slide & roller bearing slide at that,& its the carb that made DP drop the Malossi line alltogether,I have the rack on my SS of the FCR & on self split FCRs with malossi manifolds keeping the Dellorto's company.The Dells will be used on another project or perhaps this one.
"Malossi Dellorto A real carburetor"
later..RS