Ernesto wrote:I havent found anything on the Keihin flat slides.  Just an idle adjustment knob.

What is the function of the rod with a knob on its end?

What is the function of the rod with a knob on its end wrote:

I'm not sure.. I have the bike at a remote location, but will look more closely next time I am there and report back.

Laitch: I'm probably totally wrong but I think it's to shut off the accelerator pump.

You're close, Dai. 

I just received a response from a Left Coast distributor of these carbs. It is identified as three of a four carb FCR racing system. The rod seems to be how the passage to the fourth accelerator pump was capped by the engine's builder.

In the response I received, cold starting was described as "whacking the throttle once or twice to prime the cylinders using the accelerator pump before starting. I wonder if Ernesto has tried that method. My experience is that some cold engines are sensitive to excess priming and throttle-wringing, let alone hand-wringing ; however, just enough priming will kick them right into action if all other components are tuned. Warm weather is likely to help, as Ernesto mentioned.

I just received a response from a Left Coast distributor of these carbs. It is identified as three of a four carb FCR racing system. The rod seems to be how the passage to the fourth accelerator pump was capped by the engine's builder. In the response I received, cold starting was described as "whacking the throttle once or twice to prime the cylinders using the accelerator pump before starting. I wonder if Ernesto has tried that method. My experience is that some cold engines are sensitive to excess priming and throttle-wringing, let alone hand-wringing Smile; however, just enough priming will kick them right into action if all other components are tuned. Warm weather is likely to help, as Ernesto mentioned. wrote:

Thank you for digging into it!!
So far the best starting response seems to be to start it with none or a tiny amount of throttle. Anything more seems to overwhelm the system until it has been running/idling for 5 minutes or so.. then everything is great.
I got the bike running in October/November and I havent been able to do any warm weather starting yet, so we'll see. I've only got a couple hundred miles on it so far, but looking forward to getting some real miles on it in not too long.

Laitch wrote:In the response I received, cold starting was described as "whacking the throttle once or twice to prime the cylinders using the accelerator pump before starting. I wonder if Ernesto has tried that method.

Yes. The Moto Guzzi method (not the parallel twins or the singles or the two-strokes - just the V-twins). Even those Moto Guzzis that don't have a visible accelerator pump on them have a small internal pump that sprays neat fuel into the venturi for starting. That should indeed work to get the engine started anyway.

have always used the accelerator pumps on my R90S for cold (and not so cold) starts

[quote defaultattr=""]im sure they are all rebuilding the bikes into the early frame and not just useing the reg Suzi QI'm sure too  [/quote]
Did you use a compressor to inflate the top rail on Madass?

Suzi Q wrote:I'm sure too 

PO wrote:

im sure they are all rebuilding the bikes into the early frame and not just useing the reg…

Chris, Did you use a compressor to inflate the top rail on Madass?

What is the function of the rod with a knob on its end? wrote:

Yes, it looks like just a cap on the accelerator pump rod.


Snuck out for a short ride on Tuesday afternoon and swapped my R60/6 to bring the K75 back to my garage for a couple weeks.
Starting was so much easier in 70 degree temps compared to low 30's, but it did still take several minutes of careful throttle babying till it would hold a steady idle or run above 3k rpms.. Then all was great
Temps are supposed to rebound to nice in Chicagoland this weekend so looking forward to putting a few more miles on the K75

Poorly crafted dig to avoid any suggestion you may have used all the vehicle registration avenues that the system affords

Another great day for a ride in Chicagoland..

Just another pic.. waiting for warmer weather

Just another day of riding..

Mostly short trips to make sure everything is good.. waiting for warmer weather before going farther.

Weather is getting warmer but still not warm.

I've put about 300 miles on the bike since I got it running.

Have you computed the mileage you're getting with your Brick, Ernesto, or are you waiting for a tropical weather front to move in up there before you do that?

Have you computed the mileage you're getting with your Brick wrote:

No.. I havent calculated mileage yet.. the ~300 miles I have put on so far is mostly local riding.. probably only 60 or so miles at highway speeds, and 5 minute plus warmups. Most of the riding temps has been in the 30s and low-mid 40s.

I am sure mileage isnt great.. probably mid-upper 30s