Zoom 21 Carbs

[shoboat]

Ron,

The next carb maybe a Zoom-12 carb,I tested one in Flint,MI last week,

and last night at Cedar Lake here in TC. There maybe a new needle base

coming out of Bolivar,TN soon. The carb is running well on my O.S.TZ-12,

but the new Nova 12 is coming soon.

Keep Testing,

Mark Sholund

 

[fishinghole]

Do the Zoom carbs fit the K&B outboards?
John

Any answers???????????????????????

 

[Charles Perdue]

What is the carb mounting hole diameter and the depth for the K&B. I may be able to come up with something. <_<

Thanks, Charles

 

[shoboat]

Boaters,

I have 30 more Zoom-21 carbs on the way here from Tennessee,

they will be ready to ship out hopefully on Friday when they arrive.

We are wondering how some of the carbs are working for you guys?

Not much input or test results yet?

Thanks,

Mark Sholund

 

[moparbarn]

What is the carb mounting hole diameter and the depth for the K&B. I may be able to come up with something. <_< Thanks, Charles

charles, i know the .21 k&b carb neck od is .437", i'll have to measure depth in the am. somewhere around the same as od, or slightly less.........all i run is .21 k&b, so i would be interested B) .

 

[fishinghole]

What is the carb mounting hole diameter and the depth for the K&B. I may be able to come up with something. <_< Thanks, Charles

charles, i know the .21 k&b carb neck od is .437", i'll have to measure depth in the am. somewhere around the same as od, or slightly less.........all i run is .21 k&b, so i would be interested B) .

Thanks for the size input Robin as I had know way of checking!

John

 

[Charles Perdue]

What is the carb mounting hole diameter and the depth for the K&B. I may be able to come up with something. <_< Thanks, Charles

charles, i know the .21 k&b carb neck od is .437", i'll have to measure depth in the am. somewhere around the same as od, or slightly less.........all i run is .21 k&b, so i would be interested B) .

Guys, I checked last night and the current Zoom 21 can not be reduced enough to fit the K&B engines. Mark Sholund is taking orders for the next batch of 21 carbs to be manufactured. If you have a request for a neck size other than the .590 let Mark know.

Thanks, Charles

 

[shoboat]

Boaters,

I just received 30- Zoom-21 carbs, enough to fill all the orders that I have had interest in.

Please set up payment options with me at your earliest convience. This is also the last batch

of carbs at this pricing. $80.00 each, plus $6.00 shipping. PayPal orders add 5% now for the

fees. We sure appreciate your business and we would like to hear some feedback soon guys.

Thanks For Your Support,

Mark Sholund

231-590-3023

PayPal address is: [email protected]

 

[moparbarn]

What is the carb mounting hole diameter and the depth for the K&B. I may be able to come up with something. <_< Thanks, Charles

charles, i know the .21 k&b carb neck od is .437", i'll have to measure depth in the am. somewhere around the same as od, or slightly less.........all i run is .21 k&b, so i would be interested B) .

Guys, I checked last night and the current Zoom 21 can not be reduced enough to fit the K&B engines. Mark Sholund is taking orders for the next batch of 21 carbs to be manufactured. If you have a request for a neck size other than the .590 let Mark know.

Thanks, Charles

charles, the neck (as stated before) is .437". the neck lenght is .365". the k&b front housing carb mount hole has a step/shoulder in it, .340" down. the the apparent mismatch is taken up by the carb neck o-ring. and since depth of the carb is controlled by the step, you need the correct, round (not flattened), soft o-ring B) ! sorry it took a few days, just finished moving, had to find which box my digital calipers were in ............

 

[SayMikey]

What is the carb mounting hole diameter and the depth for the K&B. I may be able to come up with something. <_< Thanks, Charles

charles, i know the .21 k&b carb neck od is .437", i'll have to measure depth in the am. somewhere around the same as od, or slightly less.........all i run is .21 k&b, so i would be interested B) .

Guys, I checked last night and the current Zoom 21 can not be reduced enough to fit the K&B engines. Mark Sholund is taking orders for the next batch of 21 carbs to be manufactured. If you have a request for a neck size other than the .590 let Mark know.

Thanks, Charles

charles, the neck (as stated before) is .437". the neck lenght is .365". the k&b front housing carb mount hole has a step/shoulder in it, .340" down. the the apparent mismatch is taken up by the carb neck o-ring. and since depth of the carb is controlled by the step, you need the correct, round (not flattened), soft o-ring B) ! sorry it took a few days, just finished moving, had to find which box my digital calipers were in ............

So my friend Charles your building carbs instead of the thirst quencher. AWESOME soon as you get a 67 size my scale boat needs some ZOOM ZOOM ZOOM Mikey

 

[Charles Perdue]

Hello Mikey. I had to make a choice for one or the other. Not enough time for both this year. A little "HILLBILLY COOL-AID" would sure taste good though.

What engine are you running in your scale? :huh:

Charles

 

[SayMikey]

Hello Mikey. I had to make a choice for one or the other. Not enough time for both this year. A little "HILLBILLY COOL-AID" would sure taste good though.
What engine are you running in your scale? :huh:

Charles

cmb 67 hr greeny

 

[TERMINATOR]

Hello Mikey. I had to make a choice for one or the other. Not enough time for both this year. A little "HILLBILLY COOL-AID" would sure taste good though.
What engine are you running in your scale? :huh:

Charles

cmb 67 hr greeny

i and a few are also wanting to check these out as well.. sounds good to me to have options for carbs..good work.!!!!

terry

 

[Charles Perdue]

Another satisfied customers Email:

Hi Charlie,

This confirms our recent detailed conversation regarding the results of my first test session using a Zoom carburetor on a MAC .21 in my record holding Sport .21 hull. This boat/engine combination was selected because of its running consistency and the challenge of pulling the 42mm record propeller. The objective was to run the stock MAC .21 carburetor and then install/run the Zoom .21 to observe if there was any recognizable change in results.

The word that best sums up the results is "SURPRISED". I did not believe that a carburetor change would make much of a difference. I was wrong.... it was significant!

Each of the test began by using the reliable MAC carburetor and then installing the Zoom .21 carburetor. No other changes were introduced.

Test 1: Mac carburetor- With a cupped 41MM PROPELLER the boat launched and was "on step" by the time it reached turn 1. The boat was slowed until the transom touched the water, milled for a lap and then accelerated as it approched the start line. It hesitated, got on the pipe and reached full speed in turn 1. This was done several times with the same good results.

Test 1: Zoom .21- With no other changes, the Zoom was installed. The boat launched and immediately got "on step". It was slowed until the transom touched, milled for a lap and brought to the start line. It accelerated so fast that I was shocked. Within (approximately) 20 feet it was "on step" and at full speed within 60 feet! It has never done this even with the record engine. I leaned the mixture, brought the boat closer to the shore and repeated the start. Anticipating the engine would die, surprisingly it accelerated even quicker. This time it "jumped on step" and was at full speed within 40 feet. These amazing results were repeated 7 times before bringing the boat to shore.

Test 2: MAC carburetor-With the mixture reset to normal flow and the RECORD 42MM PROPELLER installed, the boat was launched. It promply died. This was repeated 3 more times. It appeared this engine was not going to pull the 42MM PROPELLER!

Test 2: Zoom .21- The Zoom .21 carburetor was installed and the boat launched. It was on step within 50 feet and at full speed before turn 1. As with the previous test, the boat was slowed until the transom touched, milled for a lap and brought closer to the shore while approching the start line. Without much hope it would keep running, the throttle was advanced. It jumped "on step" with the left sponson in the air and was at full speed within 50 feet. This was repeated 8 additional times. My wife, who was helping me asked; "Why does the engine sound different and the boat go so much faster? Why are you so happy?" I took her to lunch!

Charlie, I consider this a preliminary test because it was with a single engine and has not been repeated with the Zoom .21 on my other engines or boats. As you know, I was pleasantly surprised with the exciting results and based on the results of this one test session, it would appear that the technology in this user friendly, quality product somehow enhances engine performance. At this time I will not jump to conclusions that the Zoom carburetor will show these same outstanding improvements for all engines/boats/people. HOWEVER, I would like to order two additional Zoom .21 carburetors for my record engines! I look forward to communicating those results.

Sincerely,

Jim Wilson

Reprinted with the permission of Mr. Jim Wilson

 

[anthony_marquart]

Any status on the .12 carb?

 

[Charles Perdue]

Hello Anthony, the specs for the Zoom 12 were finalized yesterday. The carb performed very well. Now I have to get the tooling and the fixtures done. It will probably be after the holidays before they are ready.

Thanks, Charles

 

[anthony_marquart]

GREAT,.. I'm looking forward to it.

Hello Anthony, the specs for the Zoom 12 were finalized yesterday. The carb performed very well. Now I have to get the tooling and the fixtures done. It will probably be after the holidays before they are ready.
Thanks, Charles

 

[BB Mods's]

Cant wait for a zoom 90~101 carb!

 

[ALLAN YUEN]

Hi Mark S h34r: I wonder that will sell zoom 45 carb price? will fit to MAC45? let me know thanks, Allan

 

[Pumpin]

HI MARK,

KEVIN FROM AUST JUST WONDERING HOW THE 21 ZOOM CARB`S ARE COMING ALONG.

THANKS KEVIN.