Brooking 850
VIP MEMBER
- Joined
- Oct 3, 2011
- Messages
- 1,609
As my road bike is apart I would like to double check the outer primary cover protractor accuracy.
With the head yet still to go on and the motor on the bench, I have set up my dial gauge and crank protractor and measured off TDC as zero then set 28* BTDC on the crank protractor.
My dial gauge reads 0.2514" flat top piston down the bore (6.80mm) no barrel gasket and barrel recently machined flat, probably 0.004" to get it flat and true.
I left the crank in this position and then mounted the inner primary cover, alternator rotor and nut.
I then bolted up the outer cover and checked the riveted protractor, just a hair over 30*
Has any one done this before and if so what measurements down the bore did they get at 28* BTDC with flat top standard pistons?
Regards Mike
With the head yet still to go on and the motor on the bench, I have set up my dial gauge and crank protractor and measured off TDC as zero then set 28* BTDC on the crank protractor.
My dial gauge reads 0.2514" flat top piston down the bore (6.80mm) no barrel gasket and barrel recently machined flat, probably 0.004" to get it flat and true.
I left the crank in this position and then mounted the inner primary cover, alternator rotor and nut.
I then bolted up the outer cover and checked the riveted protractor, just a hair over 30*
Has any one done this before and if so what measurements down the bore did they get at 28* BTDC with flat top standard pistons?
Regards Mike
Last edited: