Cycle News is a weekly magazine that covers all aspects of motorcycling including Supercross, Motocross and MotoGP as well as new motorcycles
Issue link: https://magazine.cyclenews.com/i/141023
Ol M " '" '" -- eN ..... Ol «> By Rod Bre aker > e ~ til ;: W T UNING T HE BSA TWI N Z LATE MOD EL W ..J U >- U 6 .1 Always clean th e contacts by open ing them up, in serting a p iece of bu sin ess card , ro t at ing i t b ack and fort h, an d th en o pen ing t he p o ints to remove it. N ever just drag th e card t h ro ugh t he p o in t s. 3 ,) Eng age f o urt h gear and ro tate rea r w heet fo r acc urate posi t i o n in g of t h e engine f or val ve adj ust ment. Thi s is be tter an d easie r than tryi ng t o do it w ith th e k lcks tarter. As p ro gress ma rch es on thro ugho ut the world , th e m o torcy cle indust ry m o ves a lo ng w ith it as is ev iden t in th e new BSA tw ins . They ar e ac tually m ak in g it eas ie r an d q ui ck er for th e m e ch an ic to ti me the m a chine by ge t t in g toge ther w ith the Lucas people wh o m anuf actu re th e e1e c tric s for thei r m achin es. The y h ave co me up w it h some ve ry ad vanced cha nges. Fir st, th e y h ave re m oved th e ' co n de nse rs from th e con tact plate an d ch a ng ed th e p lat e so th at eac h se t of c o n tac ts may b e brough t in t o t ime individuall y w ith o ut changi ng th e p o in t gap . T hey h ave a lso in st all ed pe rm a ne nt timi n g m arks o n th e ro to r an d c haincase cove r so it is now possible se t the igniti o n tim in g wit h a timin g ligh t. If you h ave one of th ese new m odels. here are a fe w tips to fo llow if you a re pl annin g o n tu n in g yourself. .... 1.) First rem ove spark p lug s. M ak e it a r ule to a lways ins ta ll new p lugs eve ry ti m e you do a tun e-up . Th is i s a good h ab it t o get into . 7.1 N ow, with t he engin e ·r u n n ing and a regu lar automotive ti ming l igh t , adjust poi n t pla t e for each cylinder until m ark on ro tor l ines up w ith st at i o nary poin ter on cov er after remov ing small in sp ecti o n pl ate on th e f ro n t of the primary cha incase cover . 4 .) Set left i nt a k e valve w h en right intake val ve is full open , set left ex ha ust valve w hen righ t ex h aust valve is fu ll open and vice-v ersa. Hand book reco mmen d s .0 10 i n . sett ing , but good resu lts can be o btained wi t h .008 in. in ta ke and .0 10 in . ex ha ust . to .' EOU IPME NT AND PA RTS NEEDED N ecessary size Whitworth wrench es. V ari ou s size screw dirvers, both regul ar and Phillips. Plu g wrench and two new spark plugs. Feeler gauges of .008 • .01 0 and .0 15 in. th ic kn ess. New rocker b o x cover gasket. 2.1 Si x nuts removed w ill allow th e rocker box co ver to be removed , a lot easier i f gas tank is remo ved first . I f cover gask et sh o u ld tear on rem ova l, install a new one. 8 ,) T h ese models are eq ui p ped with t he new concentric -float Amal carb s, set t he id le air screw 1 ~ turns out from b o ttoming, m ak e you r f in al carb ad j ustments f or i d le and y ou are ready for m ore m i les of r id ing pl easu re. 5 . Thi s shows th e new point p lat e wi t h t h e sep arat e contact and timi ng adjustments. Set the co ntacts to .0 14 - .0 16 on t he h igh lobe of th e cam . Hand Washable Ho td og! We Try Hflrderll - Ri di t1 g • Racin g • S tree t GLOVES Stay Soft Orange C ounty's l argest S U Z U K I D ealer SALES, Othma n Dist ribu tin g Co. 182 27 Lud low St . Nor th ridge, Ca. 9 13 24 o.~, Co",p•• I. ,n •••Ol" p , .U .. ","n,.. 11 - . _ ._- -- --- . Mike Patrick's _. --t·, YAMAHA of C OlONA d l~ OCC",O " . ' . .. ' 1'1'0•• 1. "" "I "'d.. O~_ 0;...1'1 •• h,n ,n, •.,.. . 1_ '" a ..llaco , ...." ... .u HOURS, , Anah.... , ......Iy SportcyC" 1101 E. 6th St. - Corona C7l4l135-7721 740 N. ArlIMim BIwd.. Anlheim , CM.f. i2806. 17141 7n 308CI .. 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