SF3 inlet stub spacers

Opening out the ports also opens a can of worms.

Usually factory heads had porting to match carbs etc etc etc, they had rough
castings usually so a gentle fettle helps but to enlarge them means all sorts of
fueling changes and hours on the dyno.
 
Opening out the ports also opens a can of worms.
 
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Not in this case Andy - the ports on most of the SF's matched the 36mm carbs - to have a 1?mm step is not very good on any inlet - maybe some heads were a transition from the old 30mm carbed SF's. Surprisingly the Laverda 750's (SOHC) don't generally need a load of farting about with carburation when they have been modified. -Regards - phil
 
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