Cycle News - Archive Issues - 1970's

.lfIIJ L A .\ 'J) 1I'/:'STSInF O/'Tl. IIIST . or, messIng WEST TEXAS $10,000 MOTOCROSS MARCH 29 an.d30.1975 * '. around,with the rear end ~ '& other cheap thrills MIDLAND, TEXAS ALL CLASSES .PAY 10 PLACES $2500 IN SUPER TROPHIES *.. GUARANTEED PURSE -' RAIN OR SHINE !!I Starting line up is by order of sign up, for 1st Moto - SIGN UP EAR LY ! By John Huetter FOR POSTERS AND PRACTICE STARTS 8 :00 AM SATURDAY Beginner . Mini . Jun ior. Intermediate. Senior SENIOR PA YOFF 1st PL A CE 2nd PL A CE 3rd PL A CE 4 th PL A CE 5th PL A CE $1000.00 750 .00 500 .00 250 .00 200 .00 ENTRY FORMS, CONTACT : Quality Auto Sales 2600 E. 8 th 6th PLACE 7t h' PL A CE 8th PLACE 9th PLACE 10t h PLACE $150.00 10000 75 .00 50 .00 25 .00 Od essa, Te xas 79 76 1 1915) 332.·1 504 Lodg ing and Camping Fa ci lities Ava ilable eSCUOERIA " t New AMA Pilot Program l ~ weekly ~ Friday night starting _ Feb.14 - on t e 1~ mile -8 PM Courses: Half-mile, Q uarter-mile, TT racing Classes: M ini-eycles (catalogued production models), .125cc, 250cc/360cc Open to any riders, except AMA Pro Experts. All ages with 13-year-old maximum in Mini-cycle class. Trophies - other contingency awards for all three classes. Grandstand Admission: $2.50 $1.50 $1.00. Free parking all street motorcycle riders. Notes: Professional advancement points paid to licensed AMA Novice and Junior riders in every heat race, Semi and Main event. 213-321 -1610 Info . . . dial: Daytime ' 213-323·971 0 213·676-8124 Nighttime 213·532-6363 fe). International Husqvarna Training Center March 24 th ru 28 Boise, Idaho . April 7 thru 11 Vacation pres en ts 1975 Schedule February 4 thru 7, 11 th ru 14, 18 thru 21, 24 thru 28 These classes all to be held at Carlsbad Raceway Special Easter Vacati on C1tsses March 25 thru March 28 and April 1 thru 4 Carlsbad, Califor nia HUSQVARNA PENTON LA VERDA SALES . SERVICE ·. AND MAIL SPECIALISTS (213) 542-1695 The Finest Selection of Parts and Accessori es For Bike and Rider We Offer Expert Repairs Port ing and Compet ition T un ing Re ceive $5 0 Wort h of Parts and A ccessories FREE When You Buy a New Husky or Penton. 24 19 Artesia Blvd . Redond o Beach, Cal iforn ia 90278 The front end that'works! or y o ur mo ney back. These Fr ont end D a mpeni ng Un its are designed f or RACIN G over ro ugh ter rai n . T hey will gi ve y o u a ri de seco nd t o none I April 14 thru -18 Salt Lake City. Utah also Carlsbad . Californi a No modifications, just bolt in the new units. June 24 thru 27 and July' 1 thru 4 Unadi lla Valley Sport Cent er CZ 1" m ore tr avel; Y AM A H A 250/360 & Y Z 8 " tra vel ; KAWASA KI 250 o r 45 0 8 " t ravel ; SUZ UK I 250/400 8" travel ; BET OR dampenin g rods f o r 8 " For in fo w rite : H.I.T.C., 1320 Grand Ave., Suite 12 San Marcos. CA 92069 7 14-744-2 161 or 7 14-729-3492 travel. TERRY INDUSTRIES P.O . Box 132 1, Hesperia, CA 92345 714-244-3139 . If you own and ride an off-road mo torcycle of 1970 through 1971_ vintage, ' there's a goo d chance you've given some th ought to improving yo ur rear suspensio n . travel. The re are two ways of going abo ut th is. Truck on do wn to your friend ly deal er and write him a ch ec k for $ 1500-2000 for on e of 197 5 model off-road /racing the machin es with a significant in crease alr eady designed in to th e chassis or , if y ou ei ther can't ge t a b uyer fo r y ou r current bike or ju st don 't happen to ha ve the ne cessary fun ds , try to do so me thing ab out 'y o ur rear su spension travel o n y o ur o wn. Times b eing wh at they are (an d the fact t hat you m ay only b e on your first re-bore with n o fra m e cracks) , you elec t to do some m odifications to y our current scoo te r. This article is a reflection- of so me th inking, home workshop ' ti n keri ng, me asuring, an d costing o n the general -su bj ect , of increas ed rear suspension trav el : what y ou gain an d ho w much it will cost y ou for each incr emen t of increase d tr avel. There's n othing very technical ab ou t it and not hing yo u haven 't he ar d ab out . before . In the first ca se, cons ider doing noth in g to your stock rear susp ension set-up so far as geo metry or incre asing rear ax le travel is co nerned. On t he mo to cr oss bike used as a test be d for th is. project, rear wheel tr avel me asured 3.5 in ches with the st andard 13 -inc h sh oc ks bolted up . The least expensive thing y o u ca n do is buy an d mou nt so me springs ' that are m at ch ed to yo u an d your bi ke's all-up weight. You 'd be ' amazed and horr ified h o w seldom th e springs that arrive o n bikes . in the showroom are really tuned to your rid ing requirements. Mo st of th em are far too stiff; so m e ar e too so ft and already co il-binding w hen you just sit o n the bi ke . It sometim es seems lik e all the m anu facturers go t a deal o n sh ock springs from the old BSA Roc ket Three 750 and, li ke most road bike co ils, t hey're too stiff for most of us in m ost of o ur trail riding. Yama ha Thermal- Flo ws and sto ck CZ da mp ers are only two examples th at be nefit im m edi ately and no ticeably fro m being m atch ed wit h sp rings of the correct lb ./in . rate. Co rrec t springs m ay provide enou gh imp rovemen t in ha n dling to satisfy your skills and n eeds. The cost of t his . " m o dificatio n " is $ 10-15 with $ 12 for a set of 75 lb ./i n. sprin gs bei ng fairly co mmon. Mos t dampers have th ree or th ree and a ha lf inc hes of p iston and shaft travel. With the n ormal m ounting posit io n of shock b ottom brac ke ts som e dis tance ahead o f th e ax le (o n our test be d bi ke , a 380 CZ, it was 2.5 inc hes) rear wh eel tra vel will be co mp arable, abou t 3.5 inches. Match ing th e corre ct rate springs to your b ike and b ody will also have the h appy effect of allo wing your dam pe rs to da mp longer in an y given event an d last longer before they . nee d ~ 1:~pl aGelllen t. I • • • i i , l 1,1' # " .~ ; T, . ' 1

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