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ropouo e moa wenea ng e
pack.This simple mechanical failure waspivotalin
Paul Smart winning therace. If you’ve similarly
spotted the Magni box-section swingarm then well
done –itreplacesthe original factory item as part of
the conversion and keeps the back end in line and
under control.
If you’re not familiar with fourcylinder MVs, here’s
aquickoverview.The bi ke ha sits origins in the
1920s/30swhen Paulo Remor designedaDOHC
500, four-potrace bike thatsoonbecame the
famous Gilera4. By 1950 MV A ggusta had pper suaded
Remortoworkforthemanddesigntheirracebikes.
Thefirstroad-goingfourwastheinfamous 600
tourerthatonlyeversoldinsmallnumbersduetoits
seriouslystrangeappearance–itwasnicknamed
TheBlackPig!EverysubsequentfourcylinderMV
carriesfacetsofboththe 600 andtheracebikes
alongwithsomeunusualdesignfoibles.Most
obviousisthecar-typedistributorbehindthefour
individualcylinders,whicheachhavetobeshimmed
tothesameheightinordertomateproperlywiththe
one- ppiece cyylinder head.Not so obvious is the
crankshaftlocation,whichutilisescarrierblocksthat
hangdownfromtheuppersectionofthehorizontally
splitcrankcases.Thelowerhalfofthecrankcaseis,
toallintentsandpurposes,littlemorethanan
oil-tightlowercover-cum-sump.
Inessence,theengineisarace-shopmotor
modifiedjustsufficientlyforittobeusedasaroad
machine.Therefore,there’snoalternatorontheend
ofthecrankaspermostearlyJapanesefours.
Instead,tuckedawayontherearlowerright-handMAINTEST
ABOVE:If onlyyou
couldHEARthisbike...BELOW:/ mechanics