To Keihin or not to Keihin

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Hero member
Location
bedford Uk
What Ho All,
                I know some people on here have fitted said carbs to their bikes and have read some of the old post about it. What i'm after is how did they perform in general and the difference between them and miks. Thankyou in advance.

               
 
Are you starting another war between the Dellorto faction and the sellouts to the future?
Are you triple or twin? Are you talking flat slide, semi flatslide, vacuum...etc etc?
I have FCR39 Keihins on my SF2, it was a total revelation in every respect and a fairly simple job. My second set of Dells were totally worn out and I went with the future.  A mate fitted FCR35 to similar bike and equally happy. It seems a lot of triples go for the Mikunis, there is thus much info and help regarding fitment and jetting with Mikunis on triples. Dellortos in good condition work fine and there are no carbs easier to set up jetting wise but they are a bit like drum brakes.
 
Bugger, ok a bit more info. Carbs are for a 1200, FCR39s and engine to be in a fairly high state of tune. No wish to start a war between standard and modified, But the bike i'm building only has frame and engine left from original the rest will be none standard. cheers
 
Can only recommend them and help you on the jetting if you like. If you have OEM ones (with Choke), I still have the choke-slider rod for the triples (and a good source for alloy bellmouthes for the Keihins as well as a trick how to make them work even better in low-end...)

cheers

Lothar
 
Whether you chose Mikuni RS or the Keihin, I have no doubt you will immediately notice they both are manufactured to a much higher standard than the Dellortos ever were.  I don't buy into the notion that you are selling out to the future by fitting these instruments.  The world has moved on to fuel injection!
If you take any pleasure in good throttle response, economy and reliability, go with modern mixers  ;) Matched with an ignition upgrade, you'll find your Laverda transformed -- and very much for the better.
 
lawrence said:
Whether you chose Mikuni RS or the Keihin, I have no doubt you will immediately notice they both are manufactured to a much higher standard than the Dellortos ever were.  I don't buy into the notion that you are selling out to the future by fitting these instruments.  The world has moved on to fuel injection!
If you take any pleasure in good throttle response, economy and reliability, go with modern mixers  ;) Matched with an ignition upgrade, you'll find your Laverda transformed -- and very much for the better.
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Hear hear

If you want to ride an old bike in a modern context why not improve the carburation/ignition/brakes/electrics/tyres/suspension etc.

Makes perfect sense to me.

On the other hand if you want to enjoy your bike for what it is - do that as well.

Just make sure you ride it and don't end sitting in your lounge room looking at it. It's not a Ducati bevel........

Cheers
Chris

I use RS's, Sachse and love em
 
Lothar, Can you remind me of the carb setup on the 39mm kehins and what is the trick for the bottom end.
Glenn
 
Gbarnes3 said:
Lothar, Can you remind me of the carb setup on the 39mm kehins and what is the trick for the bottom end.
Glenn
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Hi Glenn,

I am currently off my house for the week but will return next week and can help you with the settings. Needle BTW is an EMP, 2nd or 3rd notch from top, main jet I think is 155 but I need to check (at least 155 is a good starting point...). Don't remember the pilot jet though. Main Air jet is - I think - 120. On the low air jet I use an adjustable one (like the idle screw f.e.).

The trick on the low end is - a power blade that separates the intake channel into two halves. Great response from idle on...  ;) Power Blade needs a hole drilled into it to smoothen out things. I have the dimensions at home and can send them to you. Don't make them from alloy, way to soft (Bike spit them out on the first tour...  :o ). I made them from 1,5mm stainless steel... Be careful, Tank will touch right carb top! You will need to reshape that area under the tank gently... I tried it myself and ended up with a leaking tank, so get this done by a guy that has the right tools and experience...

Most difficult part to do is the rod that actuates all 3 sliders. Almost impossible to do without a lathe and the proper knowledge...

Best regards


Lothar
 
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