Classic Dirt Bike — Autumn 2017

pumpfeeds,in the formoftwo brasstubes,

are pressedinto the holestoo and have

restrictorvalvesinside–aspringand atiny

ball bearing.Still, amethodof cleaningthe

drillingswasarrived at and involvedsquirting

light oil downthe feed tube so the gloopwas

pushedout. Afurther refinementwastoput

somegreaseover the end of the drillingto

stop anygrindingpastegoingin therein the

firs tplace.

Idid trysquirting contactcleanerdownthe

tube but the restrictorvalvewastoo much

for the pressurisedliquidand Imanaged

to squirtiteverywhere.In the end Iused a

pumpactionoil can. Just got to reassemble

the oil pumpinto the casingthen applya

light smearof instantgasket, refitt he case

and then Ican put the Can-Amto the bottom

of the list...

Next on the workbench is likely to be my

BSA B40, whichmanagedto shedits gear

lever duringthe Pre-65ScottishTwoDay

Trial. The splineson the shaftare wornto

the pointof non-existence.Luckily,there is

areplacementpartavailablewhichmeans

the gear selectorcan be saved as the shaft

only can be replacedratherthan the whole

part. It doesof course requireastrip down

of the timingside of the engineto accessthe

internals, but at leastwith aB40 this can

be donewithouttakingthe engineout of the

frame.No doubtwhenthe case is off there

will be otherissuesto sorttoo, such is life

with a50-year-oldmotorcycle.

The Beezerdoesneedsomework

elsewheretoo, on the cycleparts or brakes

but theyare sortofacceptableand workwell

enoughto passthe MOT test, butfirs twater

splashand they’re history.

Probablythe easiestjob to do will be

the forkseals on the TY and to be honest

the newseals are in the sparesbox but

findingfive minutesto do the job has proved

awkward lately.

The biggestjob facingme is replacingthe

mainbearingsin my 250 Bultacoengine.

The bikewas rebuiltin 1988for the Scottish

Six Days Trial and internally at leasthas

Assemblycontinuesandthis

timeIattachedtheclutchcable

beforefittingthecase.

Above:LockingthecoginplaceisbyaNy-Locnut.

Right: Oncethereturnspringwasfitted,all the

caseneededwasalightsmearofinstantgasket...

areallylightsmear. Seriously,Ioncesawan

enginewheretheownerhad,inamisguided

attempttostemoil leaks,usedalmostafulltube

ofthestuff.

Rebuilt

toride

46

044 Rebuiltto ride_044.indd 46 01/08/201712:59:33