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1100 cams in a 750

H

headsbikesmopars

Forum Mentor
Freshening up an '81 GS750 16 valve. I have been told that the GS1100 cams are a bolt in mod for the GS750. My question is: I know I have to use the 750 cam sprockets (they are larger), But will the cams be installed at the same 'timing' as the stock 750 cams? The lift on the 750 cams are .258 on both sides and the 1100 cams ('80-'82) measure .275 intake and .258 exhaust. Looks to me like the 1100 uses the 750 exhaust cam but larger intake. Don't know about the duration though. Can anyone shead any light on this, please advise and thanks. Terry.
 
How much difference does it make???

How much difference does it make???

Worth doing for a non-race bike?
 
Just wondered if you managed to find any specs for the 1150 cams?
Tony.
 
Tony, yes the following cam specs. are from service manuals and from other sources. Old bike articles...ect. Cannot confirm the 1150 numbers this was from a racer friend. Terry.

1980, 1981, 1982 GS1100E camshaft specs.
Intake: 280*
opens 30* BTDC
closes 70* ABDC
lift= 7.0mm (.280)

Exhaust: 268*
lift= 6.5mm (.258)

1983 GS1100E camshaft specs.
Intake 280*
opens 43* BTDC
closes 57* ABDC
lift= 7.5mm (.296)

Exhaust: 280*
lift= 7.0mm (.276)

GS1150E camshaft specs.
Intake 280*
opens 34* BTDC
closes 66* ABDC
lift= .330

Exhaust: 272*
opens 60* BBDC
closes 32* ATDC
lift= .330
 
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