OEM Carb Mods While You Are Saving For FCR Flatslides.

[scaudill]

Must be stock, only one notch. There is a small amount of taper.

[koko64]

Yep sound like stockers. They will be way too lean for an open airbox.

[scaudill]

I have a stock airbox with a K&N filter.
If I can sort out the surging, it will be fine for me.
My local MC shop has the washers for raising the needles, I'll try that.

[koko64]

A good tune by synching the carbs after getting the spring replaced and resetting idle mixture should work. No wonder its surging. Maybe get the shop to go over the carbs and give them a tune.

[scaudill]

Koko,
The spring is replaced and carbs synced.  Idle is good.  Plugs look perfect.  I'm hoping 42.5 pilots will allow me to screw in the mixture screws some.  Then I'll try the raising the needles a touch.
Bike is a blast to ride.  Eric at Clubhouse Motorsports did my forks, I'm really happy with the suspension.
So I need to put some miles on and see what's next.

[koko64]

Cool .
Enjoy your machine. There's nothing like a Ducati.

[ducpainter]

Koko,
The spring is replaced and carbs synced.  Idle is good.  Plugs look perfect.  I'm hoping 42.5 pilots will allow me to screw in the mixture screws some.  Then I'll try the raising the needles a touch.
Bike is a blast to ride.  Eric at Clubhouse Motorsports did my forks, I'm really happy with the suspension.
So I need to put some miles on and see what's next.

He's a magician when it comes to modifying and setting up forks. I recommend him to everyone with no hesitation.

[koko64]

Did Eric end up fixing your carbs?

[scaudill]

No, but he did give me some advice.
What sucks is removing everything for access.  But, once you've done it a few times its not so bad.
This is a great forum, kept me going when I wanted to give up.

Thanks 

[koko64]

 
I seperate the battery box from the airbox into two parts to make it easier. Then a light Lithium battery is good to reduce stress on the battery box bolts and you lose 4-5kilos.

[ducpainter]

I'm old school when it comes to batteries.

Give me a flooded lead acid battery every time. I'll lose 4 kilos off my lard ass if weight is an issue.

[koko64]

My bikes get lighter, but I get heavier.

[Nibor]

need more mods for the Mikuni's Koko, so we have more time to save. need much more time to save now!!

cant believe that price hike...

[koko64]

Yep, shipped with Paypal they come in at over two grand of our Pacific Pesos.

[koko64]

Just a recent pic of two Mikuni carbs showing the before and after work. Someone handy or with experience can do this with a dremel. The carb bore is bored from the engine side and stops just short of breaking through to the bellmouth. This creates a double lip which can be smoothed out. Maybe some batches were better than others.
It gives the impression in the pic that you have made the bore larger but all that is done is unite the throat diameter with the bellmouth diameter. This gets rid of the turbulence causing step and creates a smooth radius and transition to the carb throat for better flow.
Next you radius the front edge of the lower slide to reduce slide flutter and improve flow.
Polish the bellmouth to reduce friction to the surfaces that face incoming air to increase air velocity and you get another 0.5 hp .
Maybe it's worth it now FCRs cost a bajillion.
If you want to go nuts notice that the butterfly shaft is square and not round like many other butterfly carbs . Then you can go really nuts and knife edge or "airplane wing" radius the butterfly itself.

Yep, Mikuni BDST38s, built down to a price.

However, I think the BDST 38 bellmouth has a better taper bore to it than the FCR, and a choke.