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Message started by mpescatori on 09/22/05 at 10:03:20

Title: Dell'Orto carb?
Post by mpescatori on 09/22/05 at 10:03:20

::)
I have found a 32mm Dell'Orto carb off a MotoGuzzi on Italian eBay, and given I do understand how those work, but know zero on how a Keihin works, I was wondering if it could be compatible... ???

I believe the standard carb is a 40mm, but is that the diameter of the butterfly valve (throttle) or the diameter of the intake ? If the latter is the case, then the butterfly valve _could_ be smaller, maybe 38, 36... so a well tuned 32 _might_ do the job... ::)
or am I just barking up the wrong tree :-/

Maurizio from Italy

Title: Re: Dell'Orto carb?
Post by mpescatori on 09/22/05 at 15:23:19

:D
Aw, come on guys, 12 views and not even somebody waving hello?
Haven't got a clue? :-/
Gimme a hand...
It isn't urgent, it could actually be unnecessary, ut I would appreciate some kind of support... ???

Maurizio

Title: Re: Dell'Orto carb?
Post by sluggo on 09/22/05 at 15:32:59

mpescatori wrote:

did you read the first post, " read this before posting"?,

you will get more responses if you would have posted it in the rubber side down section.

this section is for technical documents and tips and tricks not questions like you posed, that is why you havent recieved the responses. generally we are a very helpfull group. but don't always come to this section unless we need something.

also using the search feature you can find out about any topic that has been previously discussed. just set the default back further than 7 days.

welcome, i hope this clears things up for you

sluggo

Title: Re: Dell'Orto carb?
Post by babbalou on 09/22/05 at 15:47:39

I never tried it but I think the 32mm Dell'Orto would take some power off the top end & add back a little torque off idle & down low, compared to the 40mm stocker.

Title: Re: Dell'Orto carb?
Post by mpescatori on 09/22/05 at 16:07:13

Right... hmmm... we need a thinking smiley here...
anyway, I had been made aware of the RSD issue and bow my head in shame (the one with two ears, leave the 4 valves alone)
Now, that last comment makes me think, maybe if I get two 22-24mm carbs, a "Y" intake manifold, and set them up so one opens first, then the other, like a double barrel (no double barrels that small I'm afraid) maybe I could actually make it go faster AND use less gas at low revs?
??? ??? ???

Maurizio
Now, that 24/36 Dell'Orto I saw somewhere...

Title: Re: Dell'Orto carb?
Post by klx650sm2002 on 09/23/05 at 02:01:05

A slide carb would need to be at least 37mm to equal the flow of the standard 40mm cv.

Clive W :D

Title: Re: Dell'Orto carb?
Post by lancer on 09/23/05 at 06:30:03

I had posted a response when you first put your question up, but somewhere along the line it was dropped.
I have to agree that for the Savage you need a 36-38 mm carb to provide the flow needed. It would work with a 32-34 but the top end would be severly limited. I have not personally used a Dellorto before but have heard good things about them. If you are going to make the change, make it a good change. If you put a small carb on you will gain nothing.
I had thought about the dual carb setup before, but the time and expense would be too much...especially with the very mild state of tune of the stock Savage engine. If you were to build a race ready engine then it might work.

Title: Re: Dell'Orto carb?
Post by WD on 09/23/05 at 07:28:25

Why not just order a 2 barrel carb off of BikeBandit? Get one for an XT550 Yamaha. Just shy of $600 US. For the body casting, the complete unit will run over $1000 by the time it is dialed in. :o >:(

For a true bolt-on "improvement" with minimal work, swap your BS40 out for an HSR40. HSR series flow better than most other Mikuni 40mm carbs. And, you can performance tune the HSR, where as the BS series is limited to jet changes and mild tract polishing.

You could probably make an S.U. work, but, why?

Buy one of Lancer's Edelbrocks or Amals and be done with it.
-WD

Title: Re: Dell'Orto carb?
Post by klx650sm2002 on 09/23/05 at 10:18:24

Could try a Keihin FCR39/41.

Clive W :D

Title: Re: Dell'Orto carb?
Post by mpescatori on 09/27/05 at 16:48:05

I hope I get the humor behind the comments by Lancer and WD.
I have also found a Dello'Orto 30/32 double barrel ''for a fistful of dollars'' but have to see how to link it to the head via its own manifold.
I recal somebody ranting about SUs.
SUs come in ''inch'' sizes, 1 1/4'' to 2'' sizes, and 40mm match the 1 1/2'' size. Smoother pickup and extremely simple to setup, and seldom if ever goes out of tune.

Still, I can work on a Dell'Orto, never even seen a Keiin before. This is my first jap bike ever.

Maurizio
PS By the way, Mr. Moderator, if a question over compatibility between different brand carbs, throttle disc diameters and airflow isn't technical, what is? ???

Title: Re: Dell'Orto carb?
Post by Reelthing on 09/28/05 at 04:57:11

The tech section is trying to be for documents and pictures on how to do things with the discussions about it here -

anyway - I may have missed something - but do you have a Keihin carb on your ls650 and not the stock mikuni bs-40?

Title: Re: Dell'Orto carb?
Post by Savage_Rob on 09/28/05 at 06:05:00

mpescatori wrote:

PS By the way, Mr. Moderator, if a question over compatibility between different brand carbs, throttle disc diameters and airflow isn't technical, what is? ???

I don't recall any dispute as to whether the question was technical in nature. However, that's never been the point. The point is that the Technical Corner forum is for technical documentation and procedures - not questions of any ilk. Questions and discussion go to the Rubber Side Down forum. If one should develop into something that would be truly useful as a document, it can be cleaned up and placed in the Technical Corner. This is explained in the DO NOT POST QUESTIONS HERE: READ THIS FIRST! (http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1120506946) post at the top of that forum.

Drive through please...

Title: Re: Dell'Orto carb?
Post by mpescatori on 09/28/05 at 08:40:19

OK
Point taken, especially because if I intend using this forum then it's a VERY bad idea to have an argument with the Moderator.
My former experience lies with these gentlemen
www.mgcars.org.uk
you're welcome to visit, and the ''general topic'' questions are just that, general topics; anything which has to do with a cross threaded plug or a magnetic sump plug collecting swarf or tuning the ignition advance to take SantaPod 110RON fuel, well, that's ''technical''.
But I guess those gentlemen are ''Brits'' so they may not align to a ''Savage'' frame of mind.
Me, wanting to be both, I'll just have to disengage one brain and engage the other.
Being birdbrained, I have plenty of room for all my brains to play ''musical chairs'' and scurry with their little synapses all over the place.
By the way, I've also found a 34mm Dell'Orto with a dozen or so jets, fitted to a 125cc 2stroke tuned for track use only, so if it delivered 36+hp in a 125cc I guess it can deliver 32 on a Savage.
What say?

Maurizio
(weather forecast looks promising for Friday, wish me luck, 500 miles is still 500 miles, rain or shine)

Title: Re: Dell'Orto carb?
Post by lancer on 09/28/05 at 12:45:48

Maybe...the little 125 is taking a lot of small gulps of the fuel air mix to make its power. The Savage is going to need much larger gulps of the mix, but fewer of them, over a given period of time. Also, considering that most all 500 singles use a 32 mm carb for stock purposes, and a 34mm for performance use, I would conclude that the 650 Savage would do well with a 36mm at least for performance work. It will work with a 34mm but I doubt that you will get the performance level of a 36 or 38mm carb.