Mikuni RS Setup for 1100ccm Corsa engine

Laverdalothar

Laverdalothar

Hero member
Location
Germany
Guys, need your experience, please...

My SFC 1000 has been overhauled (engine by OCT) with coated Ross Racing 78mm pistons. I have the angled inlet manifolds from Red and a set of new Mikuni RS laying here (well - currently on the Motoplast engine) and am keen to put them on the bike. They were set up by Steven Topham, but for a 1200 180* Engine and have never been tested. I don't have the setup but I'd like to test them on the 1000 SFC... Not much time for extensive Testing, I want to go on a german forum meeting end of next week and might need to order some jets/needles... will ripp them off tomorrow, but would love your recommendations/experiences, please.

So - what settings are you using (especially Red, please?) for such an engine?

thanks a lot for your help!!
 
Thanks a lot, Andre and Red! Great info!

Are the needles always the same? middle position? I run them without filters currently. Does the original Airbox still work with the angled inlets, please? Was considering to put it back on...

Haven't looked yet at them closer - they don't have Air-jets as the Keihins, do they?
 
Laverdalothar said:
Does the original Airbox still work with the angled inlets, please?
Click to expand...
Yes. Been discussed many times here, Lothar - including by you!! You need to heat the airbox rubbers up in boiling water. They will then just about stretch on to the RS36. At the airbox end you will probably find you will have to push the rubbers further in than is usually the case.
Works even better with Red's angled stubs rather than the straight ones below :)

P1010359.JPG
 
Indeed... as I said at the end of my post. The airbox rubbers fit just as well... but I can't find a clear photo of that installation for you!
PXL_20230418_163948155.jpg
 
OK, thanks to all of you!

I might have to push this out a bit as the bike showed some weird lean mixture where it used to be more on the rich side before and I fear it has to do with a striped thread of the carb mounts, causing an air leakage... Can't get the trailer out to bring the bike to OCT for getting it fixed, as they just digged a big hole into our road, just in front of my trailer... :mad:

@andre: SFC not running properly, Jota has a defect on the dashboard (well - the holder has vibrated through... 2,5mm stainless steel... waiting for the new one to arrive hopefully on Friday (3mm this time...). Leaves me with the Formula (again) as the only running Laverda. And both engines have just been overhault and are not even run in (Jota and SFC1000).
 
Rob said:
Yes. Been discussed many times here, Lothar - including by you!! You need to heat the airbox rubbers up in boiling water. They will then just about stretch on to the RS36. At the airbox end you will probably find you will have to push the rubbers further in than is usually the case.
Works even better with Red's angled stubs rather than the straight ones below :)

View attachment 81821
Click to expand...

Sorry, but the stock intake rubbers and airbox *won't* work with Red's angled intakes and RS36s; the angles are all wrong. I looked at it from every possible method and spent way too much time trying, it just won't work. And I would have liked it to work. They work with the straight intakes you show in the photos, no problem.

Also, my stock internals RGS runs 135 mains as dictated by my AEM AFR gauge and 02 sensor, at around 18C at 100M elevation. Flat out it would give an AFR of around 11.8-12.8.

Ramair MV-015 filter pods per Keith's recommendation.

Pilot: 15 (gives you more adjustment range)
Stock needle 4th clip from top, washer under.

20200305_181844.jpg

Ta,

Kristian
 
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ksoholm said:
Sorry, but the stock intake rubbers and airbox *won't* work with Red's angled intakes and RS36s; the angles are all wrong. I looked at it from every possible method and spent way too much time trying, it just won't work. And I would have liked it to work. They work with the straight intakes you show in the photos, no problem.

Also, my stock internals RGS runs 135 mains as dictated by my AEM AFR gauge and 02 sensor, at around 18C at 100M elevation. Flat out it would give an AFR of around 13.5, still a touch lean.

Ramair MV-015 filter pods per Keith's recommendation.

Pilot: 15 (gives you more adjustment range)
Stock needle 4th clip from top, washer under.



Ta,

Kristian
Click to expand...
your custom cam cover stud is upside down
 
ksoholm said:
Sorry, but the stock intake rubbers and airbox *won't* work with Red's angled intakes and RS36s; the angles are all wrong. I looked at it from every possible method and spent way too much time trying, it just won't work. And I would have liked it to work. They work with the straight intakes you show in the photos, no problem.

Also, my stock internals RGS runs 135 mains as dictated by my AEM AFR gauge and 02 sensor, at around 18C at 100M elevation. Flat out it would give an AFR of around 13.5, still a touch lean.

Ramair MV-015 filter pods per Keith's recommendation.

Pilot: 15 (gives you more adjustment range)
Stock needle 4th clip from top, washer under.

View attachment 82011

Ta,

Kristian
Click to expand...
Plonk in a P-6 needle jet, that will fatten it up for you.
 
hooksey said:
Et à quoi cela ressemblerait-il vieux garçon ..... ?
Click to expand...
Look here:

Laverda 1000. Endurance Racer " 1974 " R

For sale: I have decided to sell my endurance 1974 racer. I have built the bike myself, it is built according to the original photo of the original, with the help of Piero Laverda, who sent the original photo of the original. Frame: stering head extended 40mm, frame tube at seat, lowered 25...
laverdaforum.com laverdaforum.com
 
Paul LeClair said:
for the RS 36's, I have a brand new set of floats to install. What is a recommended float height?
Click to expand...
Memory a bit dodgy Paul? It's 17mm. Note that it's measured from the gasket surface, not the outer flange.

I refer you to your own thread of 2008 :)

Mikuni RS 36 float bowl levels (again)

Hi all putting the RGS back together for another dyno session. very very carefully set the float levels at exactly 17 mm, using digital caliper. put the carbs back on the bike tonight, hooked up the fuel lines, and took yet another gasoline bath...... fuel pouring out the float overflow...
laverdaforum.com laverdaforum.com

Also, the Mikuni RS manual.
www.scribd.com

Mikuni Rs Manual | PDF | Carburetor | Throttle

Manual carburador Mikuni
www.scribd.com www.scribd.com
 
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