Hello,
I am currently building a BIMOTA HB1 replica with a GT750 engine(see separate thread). The engine will get Mikuni VM34 carbs instead of the BS40. Therefore I need to convert the oil pump control drom the rod-type to vable operation.
My question is now: how does the 34mm stroke of the cable relate to the rod version? How do I adjust the oilpump then - at max or min throttle?
Oil pump modification
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Re: Oil pump modification
I have a 75 GT750 that originally had the late-model CV carbs. The bike was converted over to early-model carbs.
The pump actuator arms have different pump alignment marks.
The late-model CV-carb bike has an alignment mark that is set when the throttle is closed.
The early-model non-CV-carb bike has an alignment mark that is set when the throttle is open.
See this thread for details:
http://www.suzuki2strokes.com/forum/vie ... mp&start=0
If you modify the late-model actuator arm so that it works with a cable, then you adjust the pump with the carbs closed. And you don’t need the adjustment mark on the carb slide. (See pic of modified arm in the other topic.)
The pump actuator arms have different pump alignment marks.
The late-model CV-carb bike has an alignment mark that is set when the throttle is closed.
The early-model non-CV-carb bike has an alignment mark that is set when the throttle is open.
See this thread for details:
http://www.suzuki2strokes.com/forum/vie ... mp&start=0
If you modify the late-model actuator arm so that it works with a cable, then you adjust the pump with the carbs closed. And you don’t need the adjustment mark on the carb slide. (See pic of modified arm in the other topic.)
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Suzuki:
GT750 2x75
GT550 72 & 75
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T500 69 project & 73 project
T350 69 & 71
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Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE