1965 FIM Motocross World Championship

Jeff Smith won his second consecutive 500cc motocross world championship for the BSA factory racing team with six Grand Prix victories. Paul Friedrichs took three victories to claim second place for the ČZ factory ahead of former world champion Rolf Tibblin.[1][2]

Smith's win riding a BSA Victor would mark the last time that a four-stroke engine powered motorcycle would win the 500cc motocross world championship for the next several decades as, two-stroke engine technology began to dominate off-road motorcycle racing until 2003 when, mounting government environmental regulations caused the FIM implemented new rules favoring environmentally friendlier four-stroke engines.

In the 250cc division, Russian ČZ rider Victor Arbekov won five Grand Prix races to claim the world championship ahead of the defending champion, Joël Robert.[3][4]

Points are awarded to the top 6 classified finishers.

500cc

Pos	Rider	Machine	AUT	CH	FRA	FIN	SWE	DDR	CZE	USR	UK	ITA	GER	NED	LUX	Points
1	Jeff Smith	BSA		1	1	1	1	4		2	1			1		54
2	Paul Friedrichs	ČZ				2	5	1	1					3	1	36
3	Rolf Tibblin	ČZ								3	2	1	1	2		32
	Vic Eastwood	BSA		5	5	3	2	2			3	3		5	2	32
5	Sten Lundin	Matchless-Métisse	1	2			4	3				2				27
6	Per Olaf Persson	Hedlund		3	3		3	6								13
7	Arthur Lampkin	BSA			4					5	4				4	11
8	Jerry Scott	BSA		4	2						6					10
	Gunnar Johansson	AMC-Métisse	2			6							4			10
10	Chris Horsfield	Matchless	4				6								3	8
	Josef Hrebecek	ČZ	5	6					3	6						8
	Igor Grigoriev	ČZ/ESO								1						8
	Ove Lundell	Hedlund/Husqvarna											2		5	8
14	Antonin Klavinsh	ESO	6			5				4						6
	Herman De Soete	Matchless			6								3		6	6
	Jan Johansson	Lindstrom				4			4							6
	Karel Pilar	ČZ							2							6
18	Broer Dirkx	Lito	3													4
	Ervín Krajčovič	ESO							5			5				4
	Josef Teuwissen	Triumph-Métisse										6		4		4
21	Pierre-André Rapin	Monark										4				3
22	Vladimír Dubšík	ČZ						5								2
	Joachim Helmhold	ČZ							6					6		2
	John Giles	Triumph									5					2
	Erwin Schmider	Maico											5			2
26	Jan Němeček	ESO											6			1

Source:[5]

250cc

Pos	Rider	Machine	ESP	ITA	FRA	BEL	CZE	GER	NED	LUX	POL	USR	GDR	UK	SWE	FIN	AUT	Pts
1	Victor Arbekov	ČZ	4	1	1			1	1	2	1				2			52
2	Joël Robert	ČZ		2	2			2		1		1	2				1	48
3	Dave Bickers	Greeves	1	3		1	3	5		3				1	3	3	2	42
4	Torsten Hallman	Husqvarna	3		4	2	2								1	1		35
5	Åke Jonsson	Husqvarna	2			3	4	3		6	4	2	3	4	4			30
6	Vlastimil Valek	Jawa		4		4	1		4	4	5			3		5		28
7	Gunnar Draougs	ČZ			3			4	3	5	2	4	4					25
8	Karel Pilar	ČZ		6	5	5						6	5	5	5		4	15
9	Don Rickman	Bultaco	5											2				8
	Igor Grigoriev	ČZ										3					3	8
	Paul Friedrichs	ČZ											1					8
12	Fritz Selling	Greeves							2					6				7
13	Jorma Jarvinen	Husqvarna														2		6
14	Fred Willamowski	ČZ									3				6			5
15	Juri Ageyev	ČZ						6	5		6							4
16	Kalevi Vehkonen	Husqvarna														4		3
17	Jan Blomqvist	Husqvarna			6	6												2
	Olle Pettersson	Bultaco-Métisse					5											2
	Alex Yakolev	ČZ										5						2
	Bryan Goss	Husqvarna															5	2
	John Griffith	Greeves		5														2
	Antonin Hrach	Jawa/ČZ					6										6	2
23	Ton van Heugten	Husqvarna							6									1
	Ivan Polas	Jawa/ČZ											6					1
	Cenneth Loof	Husqvarna														6		1
	Andrei Dezhinov	ČZ	6															1

Source:[6]