Cycle News - Archive Issues - 1970's

in the Stat es had a mo t her o f a tran s to shift . If you had a ll day to chan ge from one gear to the next, no prob lem , bu t if yo u were in a hurry , forget it. Then o ur 15 DIN eng ine ca me into t he St ates an d it had so me modifica tio ns fro m th e fact ory. Now we hav e the 19 DIN engine wit h st ill ano th er cha nge in it, which makes m issing a sh ift almos t a t h in g' of th e past. coup le o f p o unds. Put o n an alloy tank and yo u j ust go t rid of ano th er five po unds. T he frame is hea vy lo o kin g, b ut strong. Wit h its doubl e loop s lead ing in to fo ur main tub es under the tank and very effec ti ve gusse ts in all co rners t he fra me gives you en ough strengt h to h old up an engi ne fo ur tim es the weig ht of th e Zundapp an d stan d up u nder th ousands of rac ing m iles w it h o u t pro blems. Fo r ti res the bik e has a 3.00 x2 1 Met zel er up front an d a 3 .5 0x18 o n t he re ar. The fro nt hu b is su pe r s trong and th e .rear hub has ny lo n hub cus hions d riving t he rear spro cket in a q uick ch ange se t up - you ca n r~m ove th e re ar w heel withou t - ta king off the c ha in or rem 0 ving t he sprocke t fr om th e swin gar m . T he rea r whe el also has fou r be arings, t wo in t h e hub itself and two in t he sprocke t carrie r. T he bac k o f the sw inga rm is bo x sty le like a Maico, The new 19 DI N engines h ave a ne w shift drum assembly in them fro m t he factory. T his new drum will fi t in any of the olde r 12 5 Zu ndap ps , 12.5 DI N and up. It is pa rt nu mber 285-05 -723 whi ch any Zun da pp dealer can order fo r you dir ect fro m Rockfor d Moto rs. Wh at's the difference in this new drum? T he secret is in th e shif t pawls ; th e n ew sty le pawl s arc fla t an d cupped o n th e end, where the o ld sty le pawls a re sha rp pointed o n th e en d an d don 't have as much surface co ntac t as t h e new s ty le pawl does. o C'J If yo u want to d o it yo u rsel f. break o ut yo ur shop manua l that co m es wi th your bik e and turn to p age two , fo llow th e steps fro m figur e seven th rough figure 16 . I n figure 16 you can see th e end of t he sel ecto r shaft, right beside th e clu tc h bearing. Reach in an d ge t a hold o f th e selec to r sha ft an d pull on it. lt will pull right o ut of the eng ine. Do n't worry ab out an yt h ing inside o f the en gine fa lling .o u t of p la ce , it 's mad e so you ca n p ull it o ut without displacing Yo u say yo u hear they do n ' t sh ift? If you m ean d o th ey shi ft like a J ap an ese . bi ke, no they don 't , bu t t hey 're b etter than th e firs t Zunda p ps imported fo ur years ago . Befo re I -e xp lain wh a t ch anges have been m ade, let me she d a little ligh t o n t he gea r shift thro w. T he lever is too lo ng fo r m ost riders and if yo u will cut it down o ne -ha lf inc h in length and weld it bac k to ge t he r aga in yo u will tak e care o f 95 percent ' of your problems. T he firs t 12.5 D IN engi nes that ca m e Co ntinued o n page 42 This is the first editio n of E.C. Birr's new co lum n , E.C.'s Test Bench. Here's h ow it wo rk s. So meb ody ma k es so met hing th ey say make s'yo u go fast. OK, E.C. gets his hands on wh atever it is, t ests the beejeesus o ut of it, and th en delivers th e ve rdict - it ei t her works o r it doesn 't. If it doesn't, he co nfers w ith th e manufact u rer to see what the y'll do a bo ut it, test s it a second tim e after t he y 've had a chan ce to fix it righ t, and th en te lls you wh at he learned about the pr od uct or service teste d. Compan ies want in g st uff te sted ca n send it to E.C., c/o E.C. and Walker, 509 Ind ust rial Aven ue, Boynton Beach , Flori da . . . Ed . Yo u'v e heard the o ld say ing, get a piece o f t he acti on? Well, a stock - 125cc Z undapp is abo ut as close as yo u ca n get when y ou buy a stock mo torcycle. The Z unda pp motorcycl e has accu mulated more Go ld Medals than any ot her mo torycIe ever built, In the past 51 years, Zunda pp has wo n 9,9 23 G old Medals wi th out ever building an e xo tic "w orks " machine. That 's righ t. th e Zundapp yo u bu y righ t off the sho wroo m floor is close to wh at th ey rid e. When y ou get a Zu ndapp yo u have th eir "wo rk s" mach in e. Zun dapp sta rted in 1917 producing armam en t p arts fo r the war , but this cam e to a quic k ha lt wh en WW I ended. In 19 22 Zundapp wen t into serious mot orcycle product i on . th eir first being a 21Icc two stroke sing le with 62 mm bore and 70mm st roke . It ch ur n ed o ut a reliabl e two an d a q uarter BHP an d had I started to do t h is tech a rticle test six m o nt hs ago. When yo u get righ t do wn to it any n ew b ike is neat fo r t he first t hree o r fo u r weeks, but run the same tw o bi kes for six mo nt hs and th en yo u know what yo u reall y have. T h e Zu ndapp j\IX is very easy to ri de and has en ou gh ho rsepo wer to be compe titive in loca l Califor nia races. This bi ke co uld be a win n er in Junior or Amateur clas ses , b ut as an Expert or Pro class r acer it wo uldn 't cu t it - j us t no t eno ugh ho rsepo wer. Y o u know w hy ? Beca use there is no suc h th ing as a st oc k I 25cc Pro or Expert bike win ning. (Ad vertisers clai m "We wo n this, and we wo n tha t o n o ur bi ke . run right d own to yo ur lo cal de aler and you, to o, can be in t hat win ner's circle. " llull- - l It just isn ' t that way .) Let 's look at the s to c k MX and see wha t yo u start with. T he 125 cc MX is rated a t 19 DI N hor sep o wer, whi ch is abo u t 17 at the re ar wheel. Is it a p ipey bik e ? No , it will pull from t h e bottom Diagram 1 N 2nd a Bosch m agnet o, pro ba bly sti ll the bcs t on the m arket. Th e first Zund ap p wi ns were logged on th is bi ke by Hans Metchs and Rid er ' Wolf, in t he No rth Bavar ian T rials a nd th e W u r ga u Hill T rials. At the Reichc1sdo rf track , th e Z2 2 ra n fo r 133.5 14 kilom eters on o nly one lite r of fu el. T ha t works o ut to 268 m iles p er ga llo n , (w ith the pri ce of gas today maybe we o ug h t to have them bring it ba ck into p roduc tion ). But wha t ab o ut th e Zundapp th at yo u bu y today ? It 's hetter th an last yea r's model and there are t w o bike s to choose fro m, th e I\IX an d th e Enduro . The End uro is st ree t legal and has a wid e r a tio gear bo x. 3rd 4th 5th like a good . good , runnin g 1 75cc engine.. I coul d go into a who le boo k and te ll vou ho w th e bike hand les b ut th e ~ecord speaks for itse lf. It 's good. If yo u 're . long in the leg th e scat to peg height fi ts very co mforta bly. T he engi ne is rubber mount ed in t he fra me , whic h makes a hig di fferen ce o n a lon g rid e. This is the o nly sm all bik e I knuw o f wi t h a rubb er moun ted engi ne . First impressi o n yo u get fro m loo king at t he bike is th at it loo ks big, and must be ve ry hea vy. Wrong: the Enduro weig hs right a t the 200 pound mar k and th e l\lX is 190 poun ds. Pull the ste el fender o ff the back an d p u t o n a plasl ic fender a nd you can get r id of a r Zundapp specs . Wit h every new Zundapp so ld you shou ld get a set of counter sprockets , (12 to 15) , a set of too ls, a shop ma nua l a nd parts boo k . Motocross Ma x. rated output Ma x. t o rque Carb . Bing t ype Electrica l system S park plug heat ra nge Ign it io n t im ing BTDC O verall t ra nsm ission rati os: 1st gear 2nd gear 3 rdgear 4th gear 5th gea r F uel ta nk capac ity Ret a il pricerWest Cost End uro Max. rat ed o ut put Ma x torq ue Car b . Bing type Electrical Syst em Spar k plug heat rang e Igni tio n t imi ng BTD C O verall t ran smission ratios: 1st gear 2nd gea r 3 rd gea r 4th gear 5t h gea r F ue l ta nk ca paci ty Ret a il pr ice. West Coast . Both Whee l base Leng t h Wid th .. , Heiqht : 19 DIN ·HP at 7, 8 00 RPM 12 .60 ft /lbs. at 7 ,600 2 /27/9 Bosch Flywhee l magneto w ith COL Bosch W280M,1 1.5to 2.00101 " ., • 29 .195 18.604 13.166 10.304 8 .157 2 .7 gallons $89 5.0 0 17 DI N·HP at 7, 60 0 RPM 11.5 ft./lb . at 7 ,50 0 RPM 2/2 6 Bosch f lyw hee l mag neto Bo sch W280M -1 1.9 - 2 .2 0101 ~ : : ' 3 1.28 19.94 14. 10 11 .04 8 .74 2 .7 gallons $950 .00 - 52 " 67 '% ,.. ' 2'4 Y, ' 3 '3" 33

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