Cycle News - Archive Issues - 1970's

ellolDe Workshop TIPS ON KEEPING UP YOUR YAMAHA DT-1 The Yamaha DT-l was the start of what has become a procession of 'enduro' models right down to the 1) With the front left-hand cover removed; you can see the timing marks. The mark on the flywheel must coincide with the 'mark on the stationary pointer (arrow) at exact time of contact opening for proper timing. ~l"lIII.~~""" 'mini·enduro'. These machines have had the basic appeal to all riders, in as much as they can be easily adapted to whatever type of riding a person happens to prefer. Regardless of what type of riding you bKe - be it street, 2) The timing may be set with this type of timing tester commonly called a 'buzz box'. This is available from Suzuki and Honda dealers. The timing device sold by Yamaha will do the job just as well, as will a Dunleer timing tester. Anything that will let you know the exact moment of the points opening, !'en an ohmmeter, will do. M ~ z By Rod Breaker ~ your pnmary reference will be the- riders ~ handbook that was provided with the w bike. But we offer the following to help d clear up some points and help you over ~ the rough s;')ots. racing, trials or just playing out in the desert - the Enduro should be in proper tune. We present this article to cover some of the simple tuning procedures that the rider may perform himself. Naturally, 3) A conventional timing light can also be used to set. the timing with the engine,running. The only drawback here is that the engine must be turned off to make any adjustments necessary. To make any adjustments with the engine running, one would have to be the fastest screwdriver in the world. 4) Due to the position of the spark plug and the hole drilled for the compression release, it requires removal of th"e head to time the engine with a dial indicator. The correct timing is .126 inches or 3.2mm BTDC. Clutch adjustment is carried out under this cover. Back off lock nut and lightly tighten down center screw until it meets light resistance. Back it off Yo turn and, holding it in this position, tighten the lock nut. There is a front and back to th is sma II cover, so check it when re-installing. 8) Oil filler cap has dip stick attached for checking level. The proper amount of oil (1000cc) is stamped on the engine case. It takes a little more than a quart. This should be changed at the intervals recommended in the rider's handbook. 5) One of the greatest innovations put on this machine is the Mikuni with the main jet that can be reached from the side (No. 150 stock jet). Unlike most Japanaese 2-cycles with Mikuni carbs, it is not necessary to remove the carb to change jets, .,;cr........~~~..,..,.-.., 6) The idle air screw has remained basically unchanged from anybody's carbo Average setting is 1Yo turns out from bottoming, it will seldom require any more than a 14 to a % turn either way for fine adjustment. 7) HRLGoesto Bonneville 9) The oil pump is located under the front right-hand cover. It is correctly adjusted when the pip on the cam plate aligns with the sheer pin (arrow) at the closed throttle position (idle). 10) The seat is hinged to prOVide access to the oil tank filler cap and the small 6-volt battery. Top up the battery regularly with distilled water. Access to the filter is also gained under the seat, wh ich should be cleaned regularly, or better still, replaced with a Filtron. L~-·., . . . . "J _~. "-' ....... ._. ..L --:: / --- 11) They have provided a novel system to prevent filter bowl leakage by using a separate knurled securing ring to prevent scrunching of the rubber gasket. Clean the filter bowl regularly. Doral Eckhardt of Long Beach, sets 3 speed records using HRL Products. 12) A single phillips-head screw is removed to allow the exhaust baffle to be .removed for cleaning or converting the pipe into a noise maker. (Yes Virginia, some people do such stupid things). If the machine is operated with this removed, the plug should be checked to see that the mixture is not too lean. It may require a step up in main jet size. There it is, hope it is of some help. CLASS Aps·AG·l00 "A·AG·l00 A·A-l00 • OLD RECORD CC 100 100 100 OPEN 79.774 mph 84.816 mph / / ~ ' INTRODUCTORY $29.95 10.304 mph 6.823 mph 2 CYCLE OIL WITH CO~U)IOAL GRAPHITE formula'''' '''' " f , " ~; C.aptllUI 11'1 un'llC~,"ea WITH THE NEW "STUFFER' THE ULTIMATE IN EFFICIENCY, FEATURING SIX REED POWER. BULTACO YAMAHA SUZUKI INCREASED •••••••••••••••••••••••••••••• , III t: .. I r .. 0 • d' n.ll' y ~I •• nt Unuwal Wei WeitlnC!. LUb"U'nt " ,,,,",Uno POS,UI/(l LuOfoca"on I", H.". to ROiICn ell..," Pa.h. hut-and BTUFF/TI NEW RECORD 95.728 mph 90.078 mph 91.639 mph h. Ihe only lubtlc~nl the' win 00'" Posl!llle Lublicat,on In the UP""" '11'19 bell jlfe.. ' WIll NOt Collect Ojl', OU11 111'10 Gdl UneouallO(J '0' !?tiOlrl 0, E"hau.l POtI OfIPOloll •••• lllOuCIIlO til' 'PP,oKlmate. IV 70'M.! Wu! ., ,alh';;ea 2:,,,,, Oirt ROlla AoGll'lg. tlv apP,olC.ma!ely HAL 2'<:,,(,. Env"'. 0" E.,

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