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ET: Engine (Twin) rev counter ratio for rapide engine

Mark Fisher

Well Known and Active Website User
VOC Member
I have been re-building a very, very poorly constructed norvin over the last year and it has fought me all the way. However it now runs and I have fitted the drive assy for a rev-counter and therefor need a rev-counter. I may well have got this sorted but if this doesn't pan out, I need to know the correct ratio for the clock, in case I have to get one from another source or get one made up from parts. My problem is that I really want to take the bike to Barbers on Oct 7th so I'm up against it time-wise and I will only take it if it is complete and fully functional as I'll be riding it quite a bit while I'm there.
thanks in advance.
mark
 

greg brillus

Well Known and Active Website User
VOC Member
Hi Mark, The tacho on my Rapide is 4:1 ratio........tacho gearbox on engine is 2:1 Had mine on for several years now, works fine, although i don't really look at it anymore.......they can be another source of oil leak as well.........the gearboxes are quite primitive. Good luck with it ........Cheers......... Greg.
 

Mark Fisher

Well Known and Active Website User
VOC Member
Hi Mark, The tacho on my Rapide is 4:1 ratio........tacho gearbox on engine is 2:1 Had mine on for several years now, works fine, although i don't really look at it anymore.......they can be another source of oil leak as well.........the gearboxes are quite primitive. Good luck with it ........Cheers......... Greg.
Thanks guys, 4-1 it is then. The drive and associated parts are from Coventry spares so they should all be correct but it’s only two screws so I’ll check it. At least now I have options if my first choice doesn’t work out.
 

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