Gotfredson Truck

Year	Model	Cyl.	Bore & Stroke	H.P.	Load	Weight	List Price	Serial Numbers
1929	RB-26	6	3 3/8 x 4	27.34	1 1/4 ton	3,900	$1,295	RB-26-036 and up
	RB-36	6	3 3/8 x 4	27.34	1 1/2 ton	4,100	$1,595	RB-36-056 and up
	RB-46	6	3 3/4 x 4 1/2	33.75	2 ton	5,100	$2,100	RB-46-001 and up
	RW-46	6	3 3/4 x 4 1/2	33.75	2 1/2 ton	5,500	$2,570	RW-46-045 and up
	RB-56	6	4 x 4 1/2	38.40	2 1/2 ton	6,000	$3,100	RB-56-009 and up
	RW-56	6	4 x 4 1/2	38.40	3 ton	6,500	$3,395	RW-56-014 and up
	RW-66A	6	4 3/8 x 4 3/4	45.94	3 1/2 ton	7,800	$4,475	RW-66A-018 and up
	RW-86A	6	4 1/2 x 4 3/4	48.60	4 ton	8,500	$5,675	RW-86A-001 and up

Year	Model	Cyl.	Bore & Stroke	H.P.	Load	Weight	List Price	Serial Numbers
1930	RB-26	6	3 3/8 x 4	27.34	1 1/4 ton	3,900	$1,295	RB-26-074 and up
	RB-36	6	3 3/8 x 4	27.34	1 1/2 ton	4,100	$1,595	RB-36-070 and up
	RB-46	6	3 3/4 x 4 1/2	33.75	2 ton	5,100	$2,100	RB-46-0017 and up
	RW-46	6	3 3/4 x 4 1/2	33.75	2 1/2 ton	5,500	$2,570	RW-46-052 and up
	RB-56	6	4 x 4 1/2	38.40	2 1/2 ton	6,000	$3,100	RB-56-010 and up
	RW-56	6	4 x 4 1/2	38.40	3 ton	6,500	$3,395	RW-56-025 and up
	RW-66A	6	4 3/8 x 4 3/4	45.94	3 1/2 ton	7,800	$4,475	RW-66A-031 and up
	RW-86A	6	4 1/2 x 4 3/4	48.60	4 ton	8,500	$5,675	RW-86A-001 and up

Tonnage: Model A is 2.5 ton; Model B is 3.5 ton;
20B is 1 ton; 30B is 1.5 ton; 41 is 2 ton; 51 is 2.5 ton; 60 is 3 ton; 80 is 4 ton; 100 is 5 ton

Bosch ZU4 Magneto Instructions (PDF)
(Note: If you are replacing spark plug wires on a ZU4 magneto, beware the cap screws get corroded and stuck. Try penetrating lube before removing. Screw size is metric, 3.5mm x .6)