1020-2021
K&B 40 & Torpedo 40 Design Family

 This engine evolved from the Torpedo .29, .35 & .40.
It was originally designed as a front and rear intake.

The R/C engine came with many different carburetors,
starting with latest K&B w/remote and fins, K&B w/needle and fins,
Large square with K/B engraved on front, Irvine,
Perry, small die cast body, small machined machined.

This is sorted newest to oldest
Click on picture to enlarge.
.40 R/C # 4011
Shown with remote needle but also came with the same carb and needle attached.
.40 ABC
[PN 4050]
This is the ABC version of the 4011. It came with a tuned muffler and uses remote needle. Remote needle not shown in picture.
Click for>>> Owners Guide --- Exploded View
.40 Marine
[PN 4012]
40 ABC Marine
[PN 4075]
   
   
   

.40 R/C Series 75
# 8011
This is almost identical to the 4011 except it uses a very small front bearing. All the parts in the front housing are different from the 4011.

Prop driver is held on by a set screw and roll pin, the prop shaft then screws into the prop driver.

   
   
Carbs used on the K&B .40 - Sorted oldest first.
 
 

The 8011 used many different carburetors. Originally as the Torpedo it had an aluminum carburetor with a coupled exhaust baffle. Neck diameter is either .437" or .530"

Later it used an Irvine Carb. This says Irvine on the front and was coupled to an exhaust baffle.

 

Next was a small body Perry carb (main needle had a spring behind it), also coupled to an exhaust baffle. Used up to approx 1978

 

Used on 8011 and 4011...

Large body Perry with an O-ring sealed needle. Some linked to an exhaust baffle.

Used up to approx 1983

  Used on 4011...

Large square K&B carb with K/B engraved on the front

Used up to approx 1988

   
Mixture disk K&B carburetor. Used needle on carb type until 1994, then remote needle type.
 
New
Part No.
Old
Part No.
Description
Model
Model No.
Crankcase
Ringed
4011 early, 4012 early, 8011
Crankcase
ABC
4050, 4075
Head
Ringed
-
4011 early, 4012 early, 8011
Head
ABC
4050
Water Jacket w/screws
IB ABC Ringed
4012 early
Combustion Chamber
Ringed
-
Combustion Chamber
ABC
4075
Head Assembly (fittings & screws)
use 11-8721 & 11-8722
  4011
Combustion Chamber
IB Ringed
4012 early, 4075
Sleeve
Ringed
4011 early, 4012 early, 8011
Piston
Ringed
4011 early, 4012 early, 8011
Ring
Ringed
4011 early, 4012 early
Wrist Pin w/ Teflon Pads
ABC Ringed
4011 early, 4012 early, 4050, 8011, 4075
Con rod early style
-
4011 early, 4012 early, 8011
Connecting Rod w/Bushings
IB, ABC IB, ABC
4050, 4075
crankshaft
-
8011
crankshaft - counter rotating
-
8011
Crankshaft
ABC Ringed
4011 early, 4012 early, 4050
Crankshaft
(use 17-4001)
ABC
4075
Crankshaft (Counter Rotating)
-
4011 early, 4012 early
Rear Bearing
(use 18-8779)
-
8011
Front Bearing
-
8011
Front Bearing
ABC Ringed
4011 early, 4012 early, 4050, 4075
Rear Bearing
ABC Ringed
4011 early, 4012 early, 4050, 4075
Prop Drive Collet
ABC Ringed
4011 early, 4012 early, 4050, 4075
Prop Drive old style with pin for attachment
-
8011
Flywheel (Brass)
IB
4012 early
Flywheel (Aluminum) -
4011
drive pin for old style prop driver
-
8011
Prop Driver - Collet Type
ABC Ringed
4011 early, 4012 early, 4050
Back Plate
ABC Ringed
4011 early, 4012 early, 4050, 8011, 4075
Prop Stud Kit (1/4 X 28 Thread)
ABC Ringed
4011 early, 4012 early, 4050
2 Prop Stud Kit (1/4 X 28 Thread)
-
-
Engine Screw Set
ABC Ringed
-
4011
Engine Screw Set (Marine)
ABC Ringed
-
Muffler Screws (2)
Ringed
4011 early, 4012 early, 8011
Muffler Screws (2)
ABC
4050
Carburetor Set Screw (2) 10X32
ABC Ringed
4011 early, 4012 early, 4050, 8011, 4075
Wrist pin Teflon pads
ABC Ringed
4011, 4012
Idle mixture disk O-ring set of 2 (late carb)
-
-
Carburetor neck O-ring
ABC Ringed
-
Gaskets - sold in set of 2
ABC Ringed
4011 early, 4012 early, 4050, 4075
Head Shim - .003 & .010
ABC IB ABC
4050, 4075
Muffler, stud, tail and nut kit
-
4060
Muffler Complete (Screws and Plug)
Ringed
4011 early, 4012 early
Sport Muffler
ABC
4060
Muffler Adapter
ABC
4050
Tuned Muffler
ABC
4050
Front Plate Assembly
ABC IB
4075
Front plate for counter rotation crankshaft (Early style)
-
4011 early, 4012 early
Front Plate Assembly, Less Carburetor
ABC IB
4011 early, 4012 early, 4050, 8011
Front Plate
-
8011
Front Plate
ABC Ringed
4011 early, 4012 early, 4050, 8011, 4075
Piston and Sleeve
ABC Aero
4050
Piston & Sleeve Assembly
ABC Marine
4075
cable collet assembly
-
4075
cable collet 3/16 id
-
4075
Pressure Fitting
ABC ABC IB IB
4011 early, 4012 early, 4050, 8011, 4075
K&B Carburetor - .312 ID Bore (was noted to use 5965 for 4050) Must use with remote needle.
-
4050, 4075
K&B Carburetor - .312 ID Bore
IB ABC IB ABC
-
adapter - carburetor to front housing
-
8011
K&B Carburetor neck OD .530 ID .312 (use 5960 ?)
-
4012
carburetor complete
-
8011
Carburetor Complete early style with needle attached
-
4011 early, 4012 early
K&B Carburetor complete for remote needle
-
4011, 4012
Carburetor Body and Barrel
-
4011 early, 4012 earl
Carburetor Maintenance Kit
IB ABC ABC IB
4011 early, 4012 early, 4050, 4075
Carburetor Body and Barrel
ABC IB IB ABC
4050, 4075
Carburetor Snap Ring
ABC IB
4075
Carburetor control arm
-
-
Low speed screw (eccentric) and spring early carburetor with needle attached
-
4011 early, 4012 early
Low Speed Disc w/O-ring
ABC IB ABC IB
4050, 4075
Needle valve assembly for early style with needle on carburetor
-
4011 early, 4012 early
Remote Needle Valve
ABC IB ABC IB
4050,4075
 
OLD STYLE SQUARE CARBURETOR
New Part No.
Old Part No.
Description
 
-
Carburetor barrel spring early square carburetor
(use 83-0102)
 
-
Needle (bent wire type)  
-
Needle valve collet and lock nut  
idle needle O-ring  
-
Carburetor Barrel (early square carburetor)  
Idle needle with O-ring  
-
Idle needle housing  
Throttle Arm  
-
8761
early square carburetor complete NLA  
-
Idle adjustment screw and nut  
-
8785
Carburetor body NLA  

NA -- Not Available (temporarily out of stock and may be available within the next 6 months)
NLA -- No Longer Available (not likely to be produced again)