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630
V-Twin
TM
 Replica Frames...the difference is
 REAL!
The Construction
V-Twin™ Replica Frames feature steel forgings in neck, front and rear engine 
mounts, rear axle plates, swingarm and shock mounts. In this process, the steel 
is first fired as red hot ingot, next huge hammers compact and orient the grain 
structure into a rough shape of the parts. Subsequent hits form the part into its 
final shape, after which it is machined and heat treated which results in increased 
strength and resistance to wear. The related components used in construction are 
accurately formed stampings and drawn over mandrel seamless tubing which is tig 
welded together during final assembly.
Over 5200 
Served 
Since 
1995!
Use replica mount 
kit for mounting 
coil.
V-Twin Replica Knucklehead Frame
V-Twin
TM
 Replica Knucklehead Frame is an authentic repro-
duction of the factory style frame. Details include forged parts as 
original in neck, front and rear engine mounts, side car loops, top 
seat yoke, footboard tabs and rear axle plates. Exact blanked and 
formed stampings are utilized in appropriate areas. Rear fender 
cross bar is supported by exact duplicated “saddles” brazed at 
each end. Seat post and mechanical brake cross shaft bushings, 
correct tool box mount and grease fittings are installed. The 28° 
or 29° neck angle will accept inline spring forks. The frame will 
accommodate Knucklehead or Big Twin Flathead Engines and 3 
or 4 Speed transmission only. Knucklehead frames require pur-
chase of clamp on coil bracket kit VT No. 49-0099.
*Note: Includes seat post, transmission plate and axle assembly.
51-1041
Knucklehead Frame
VT No.  Year 
Rake #1 
#2 
#3
51-1040 1936  28°  Rectangular Tool Box Pads  No 5th Mount  7/8 Tank Brace
51-1039 1937  28°  Rectangular Tool Box Pads  5th Mount 
7/8 Tank Brace
51-1041 1938-40 28°  Round Tool Box Pads 
5th Mount 
1” Tank Brace
51-1947 1947  30°  2 Tool Box Holes 
5th Mount 
1” Tank Brace
Square
1936-37
Round
1938-40
2 Bolt
1941-47
Toolbox 
Bracket 
Details
51-1947
51-1040
Accepts Knucklehead or BT Flathead engine and 3 or 4-speed 
transmission. Includes seat post, brake cross shaft, rear axle 
assembly, transmission plate and a motor alignment plate 
for safer shipping. Cross shaft bushings, tool box mount and 
grease fittings are installed. Forged parts: Neck, front and 
rear engine mounts, yoke and rear axle plates. Brazed parts: 
Top motor mount, front tank mount, sidecar loops, footboard 
mount, transmission strap, center post strap, rear fender cross 
bar saddles, oil tank mount and upper rear frame bars at tank 
tube.
*Note: For original look on rear axle plates, the rear brake slot 
on the left side must be cut out at the front. We have left this 
closed for builder to remove as desired. 
*Note: Seat post and 
cross shaft bushings may require further reaming for proper fit. 
Therefore frames will not be accepted for return
Welded  Brazed  Brazed Joints   Year 
 
Rake
 
 
Joints 13  
 
 
Places Update
51-1936  51-1040*  51-1936  
1936   
28°
 
51-1039*  
 
1937   
28°
51-1041  51-1938*  51-1939    
1938-40  
28°
51-1941      — 
51-1942    
1941-Early 1946  29°
 
51-1947*  51-1946  
1947  
30°
51-0827   
 
 
1936-47  
Hardtail
51-1938
51-1942
51-0827