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Re: Mikuni Adapter on a Cool /2 Custom.
Posted: Tue Sep 01, 2020 9:55 am
by sithot
Looking forward to your progress.
OT:
FWIW, I understand these are Aermacchi manifolds holding the Dellorto carbs. This is a fantastic bike belonging to Scott Williams.
http://weissundblau.blogspot.com/search?q=R75
Re: Mikuni Adapter on a Cool /2 Custom.
Posted: Tue Sep 01, 2020 11:50 am
by schrader7032
Charlie -
I've lost track...why are you headed down this path?
Re: Mikuni Adapter on a Cool /2 Custom.
Posted: Tue Sep 01, 2020 9:34 pm
by ferrarirobinson
Fair question.
Hard cold weather starting (and leaky carbs) for a regular rider.
Charlie
Re: Mikuni Adapter on a Cool /2 Custom.
Posted: Wed Sep 02, 2020 5:38 am
by ferrarirobinson
And here is as close as I’ve come so far to my goal.
You may need to rotate photos 90°.
Certainly seems like an improvement. When the weather turns cool to cold the “proof will be in the pudding” as to Cold Weather Starting.
Ergonomics need attention and since the K75’s don’t need attention right now I can ride the R60 also and tweak at my leisure.
Charlie
Re: Couldn’t find proper stud
Posted: Wed Sep 02, 2020 5:58 am
by malmac
ferrarirobinson wrote: ↑Fri Feb 28, 2020 7:08 am
Couldn’t find proper stud spacing from the multitude of Mikuni Adaptors. Closest fit was from Oz (Australia) and required pulling carb head mount studs and had a 28mm throat at the mounting end. The head opening on my R60 is 26mm. Maybe a step is not too bad but smooth is smooth, so my design is 26mm. It also is bolt on and take off using original mounting studs.
Charlie
Charlie
Should I assume that you made these using a CNC machining centre?
Lovely finish on the work.
Mal
Re: Mikuni Adapter on a Cool /2 Custom.
Posted: Wed Sep 02, 2020 6:10 am
by schrader7032
When altering the intake track, you could be affecting the standing wave patterns that develop in the air/gas flow to the engine. It may result in a "trough" of air/gas will be in front of the intake valve just as it opens, thus resulting in poor performance.
Re: Mikuni Adapter on a Cool /2 Custom.
Posted: Wed Sep 02, 2020 12:23 pm
by San Arthur
Mikunis look "different" in non OEM motorcycles, but it makes everyday riding and cold starting soooo much easier.
R90S use Dellorto carbs and I think the RS 255 Kompressor used Amal GP carbs. And yes a perfectly tuned Bing can work flawless. You could also with the right flange install a modern Bing. Once tuned you can swap a carburetor set in a few minutes. One for show and for riding.
A few years back I installed a Mikuni on my Gold Star and it make my everyday riding at slow speeds easier and I love to have an idle circuit.
We adapted and modified the velocity stack at the museum.
Re: Mikuni Adapter on a Cool /2 Custom.
Posted: Tue Apr 19, 2022 4:57 pm
by blacknight
Hey Charlie,
are you still fabricating these for sale?
have you thought about using a flat 1/4" plate, welding onto it a alloy tube , angled ?? in / out / up .
of course having a CnC is nice but a non CnC 2 part intake may be an alternative for some who can dig and fabricate w/o a CnC .
the other thought is getting a .065" wall tube and making a venturi inside like Luftmeister did back in the 70's for /5, /6's , /7's @ the intake
I'm going the conversion route but I am using a set of 36's on my R90SRS