1963 January Cycle World Motorcycle Magazine - Yamaha YDS-2 & TD-1 Racer Test

Description: Yes we combine shipping for multiple purchases.Add multiple items to your cart and the combined shipping total will automatically be calculated. 1963 January Cycle World Motorcycle Magazine - Yamaha YDS-2 & TD-1 Racer Test CONTENTSROAD TEST: YAMAHA YDS-2 & TD-1 14TECHNICAL: CYLINDERS - SINGLE, TWIN OR MULTI? 20SANDY LANE ENDURO 26CYCLE WORLD CLASSIC: 1914 EXCELSIOR 27EAST/WEST SCRAMBLES 32ASCOT T.T. NATIONAL 34GRAND PRIX OF FINLAND 36TRIAL TEST: MAICO TRAILSTER 38ROAD IMPRESSION: TOHATSU RUNPET 40VINELAND 4-HOUR PRODUCTION RACE 42bob mcintyre memorial meet 43A MOTORCYCLIST’S CHRISTMAS 44CYCLE ROUND UP 4SERVICE DEPARTMENT 12MATCHLESS FOR 1963 4 6CONTINENTAL REPORT 48CANADIAN SCENE 49LETTERS 52RIDER PROFILE 53TOP MEN IN EUROPE 54BOOK REVIEWS 54INDEX TO CONTENTS, 1962 55ADVERTISERS’ INDEX 55DEALER DIRECTORY 56 The most enjoyable bit of work that a benev-olent fate has ever brought us was the double-barreled test of Yamaha’s sports/touring YDS-2 androad racing TD-1. These machines are quite similarin general layout, and specification, and yet their charac-ters vary considerably, the only strong point of similaritybeing that both of them do that for which they are in-tended in a truly magnificent manner.The engine/transmission package for both machines isvirtually identical. The engine is an alternate-firing two-stroke twin, and is somewhat unusual (for a two-stroke)in that the bore is appreciably larger than the stroke.Induction is through a pair of 20 millimeter carburetorsand each cylinder has, as do most present day two-strokes, a long, straight-in passage that terminates in apiston-controlled intake port. (Yamaha has a rotary in-take valve for their single, but that feature has not yetbeen applied to the twin.) The porting is, in contrastto what one might expect, not at all radical, and theengine has enough power to feel very strong from about2000 rpm right up to the power peak.The cylinders, which are entirely separate castings, arespaced quite far apart, and there is plenty of room forcooling air to get down between the cylinders. The cyl-inders are of cast iron, on the 25 bhp. YDS-2 version ofthe engine, and the cylinder heads are of aluminum. WithSu on jly spaced cylinders, it would be very easy f°rthe 180-degree crankshaft to create some uncomfortablynoticeable rocking and twisting vibrations, but in the Ya-maha engine, these forces have been subdued, somehow,and it is uncommonly smooth. Indeed, under 4500 rpmthere is practically no vibration at all; the engine feelsjust like an electric motor. At or near idle, there is a trace... And much more! 12440

Price: 15.47 USD

Location: Kingsport, Tennessee

End Time: 2024-12-17T03:11:02.000Z

Shipping Cost: 5.95 USD