I have a 1971 BSA Lightning 650 that I'm getting back on the road in a coupe of months and I want to get the rotator assembly balanced and blueprinted. Now anyone in the know knows that these are vibrating sons-a-bitches due to the fact that the motors are solid mounted to the frame and I want to cut down on that as much ass possible! What I need to find out is who can get me the ROTATING & RECIPRICATING percentages for the crank? Another question is- Is there a way to fine-tune these percentages to make it more highway freindly? Its an awesome bike and I really want it back on the road but enough is enough And anyone who gives me shit for not dealing with it obviously hasn't ridden their girlfreinds gas powered dildo down the highway for any given leangth of time!
More of a machining question than a Bike question but I posted over there as well! I know there have got to be some machinists on the board here!
Thanks Tunglegubbin! I thought it would be around 60%! I just thought I would find find a more precise measurement on here. I looked all over the internet but when your looking for stuff like that you usually get distracted by all of the porn floating around Its amazing what that stuff popps up under!
I have had many many Brit bikes balanced,70% is ok but you will be better off with 65%.The reasons for this are that you have a tendancy to do lower speed more than a higher speed So you need the engine to be balanced at that rev range.The bikes are capable of a top end of 120 mph all out.70% of that would be 84 mph whereas 65% would be about 70mph.Don't forget that slow speed vibration is harsher than high speed vibration.It all depends on how long you want your engine to last(and frame)most British manufacturers opted for 65%.This does not apply however to the Norton commando............Marq
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