OS 9B Carb and OS 3rd. Channel Needle assy. in a Scale

[rctinman]

I know that the OS 9B carb is the carb of choice for 1/8th scale, particularly, out West. How many of you are using the OS 3rd. channel needle assy. right on the carb, or do most prefer a 3rd. channel needle separate from the carb?


Thanks in advance!
Steve Ball

 

[Duck899]

With the CMB 67, I use the stock carb and a remote needle from Kalistratov that Al Hobbs sells.

 

[Mike Cathey]

seperate. I have been using Don Ferette's bases with the OS needle for years. Wouldn't consider throwing a boat out without that set up. One tip is to locate the needle as close to the carb inlet as possible so adjustments come around faster.

I don't beleive there's that many using the 9B's anymore. Either the NR or CMB carb that comes with the motor.

You coming to the scale race Rob?

 

[RaceMechaniX]

I am running the OS needle on the 9B in a hydro and it works great.

 

[rctinman]

I am running the OS needle on the 9B in a hydro and it works great.

View attachment 305007

Thanks Tyler. As I'm going to run the OS 9B carb, no matter what, I'm just wanting to know if there's any issues with the needle assy. on the carb due to vibration, etc.

Steve

 

[Olly]

Steve I had one on my Bardahl boat
olly

 

[RaceMechaniX]

I have not had any issues Steve over the 2 years running this boat. Mounting it directly just removes a leakage path and I believe the concentricity of the needle to the housing is better than a remote block. OS designed the needle for exactly this usage.

 

[John Beardslee]

Steve, we ran them mounted on the carb when they first came out with zero issues and those boats had rigid motor mounts . Thread is 1/4-32 just like a glow plug. Wish OS would get back in the marine engine game.

 

[rctinman]

Thanks Olly and John!

Steve

 

[Don Ferrette]

The only thing you'll see is the O rings in the needle will wear out a little bit sooner due to engine vibration vs. the servo holding the needle setting. The other advantage to a separate needle base is if you swap an engine your settings don't change. I've run both set ups and you'll be fine either way.

 

[rctinman]

The only thing you'll see is the O rings in the needle will wear out a little bit sooner due to engine vibration vs. the servo holding the needle setting. The other advantage to a separate needle base is if you swap an engine your settings don't change. I've run both set ups and you'll be fine either way.

Thanks Don.

Steve

 

[Steven Kinney]

I run mine on the carb on any boat it will fit. I have one 9B remote setup. It’s easier to tune with the needle in the carb my opinion but both ways work great.