Booster
04-04-2007, 07:35 PM
Passing on some info i saved from Lorcan's gpz 750 turbo site, thought it could be handy to some here.
You will need to alter some dimensions to suit whatever bike you use this on, if this isn't clear enough I can do some drawings. I might do that anyway and turn it into a "How to" if there is enough interest.
The main plate for the lockup is in 13mm aluminium. It is 133mm overall dia, and locates on the 5 clutch spring mounts via pillars which are 11.5mm deep to give the plate an air gap between itself and the pressure plate of 4.5mm. This is enough for the pressure plate to be disengaged when you pull in the clutch lever, but near enough for the arms to bear on the pressure plate without reaching the end of their travel.
The arms that carry the weights are 4.8mm thick steel. 33mm overall height, 13mm wide at the top of the "L" and 19mm wide at the bottom. They locate on a steel pin 15 x 4.8mm thick in a slot in the back of the plate 21mm x 4.8mm, the slot is less than the full depth of the plate but still allows the pin plenty of free movement. The slot is punched so that the pin cannot fall out (you can see the punch marks in the pics). The arm fits in a slot 29mm x 4.8mm which goes right through the plate. The pin is set 6mm in and up from the bottom left corner in the arm to the centre of the pin. The pins are set on a 100mm base circle around the plate.
You will also need a spacer for the clutch cover and a puller the same amount longer than stock as you make the spacer. Mine is 32mm but that isn't quite enough and required the clutch rod arm to be ground down slightly to clear the arms of the lockup.
http://www.streetfighters.com.au/forum/upload/25391247057429.jpeg
You will need to alter some dimensions to suit whatever bike you use this on, if this isn't clear enough I can do some drawings. I might do that anyway and turn it into a "How to" if there is enough interest.
The main plate for the lockup is in 13mm aluminium. It is 133mm overall dia, and locates on the 5 clutch spring mounts via pillars which are 11.5mm deep to give the plate an air gap between itself and the pressure plate of 4.5mm. This is enough for the pressure plate to be disengaged when you pull in the clutch lever, but near enough for the arms to bear on the pressure plate without reaching the end of their travel.
The arms that carry the weights are 4.8mm thick steel. 33mm overall height, 13mm wide at the top of the "L" and 19mm wide at the bottom. They locate on a steel pin 15 x 4.8mm thick in a slot in the back of the plate 21mm x 4.8mm, the slot is less than the full depth of the plate but still allows the pin plenty of free movement. The slot is punched so that the pin cannot fall out (you can see the punch marks in the pics). The arm fits in a slot 29mm x 4.8mm which goes right through the plate. The pin is set 6mm in and up from the bottom left corner in the arm to the centre of the pin. The pins are set on a 100mm base circle around the plate.
You will also need a spacer for the clutch cover and a puller the same amount longer than stock as you make the spacer. Mine is 32mm but that isn't quite enough and required the clutch rod arm to be ground down slightly to clear the arms of the lockup.
http://www.streetfighters.com.au/forum/upload/25391247057429.jpeg