![]() ![]() Refer to the General Data pages in the Works Manual for dimensions. All 350 cc engines until 1968 feature steel con rods while 500 cc machines all have RR.56 Hiduminium alloy rods. Dynamic balancing can smooth the crankshaft vibration inherent to parallel twins but with these smaller twins the benefit is marginal.Īpart from the very first T21’s all models share the same crankshaft until 1968 when this is changed across the range. Weak points are Timing side oil feed on pre 1969 machines which, can be resolved by a period “Devimead” conversion. Generally the engine is reliable without modification as long as the state of the components such as the main bearings and sludge trap within the crankshaft is known. I must mention John Healy and Don Hutchinson the USA Triumph Experts who assisted me with additional information. Care should be taken not to dispose of or damage parts so that the machine cannot be returned to standard in the future. All modifications are of course a personal preference and should be done only after some thought as to what you intend to achieve. I cannot warrant the success or failure of them. I have listed the modifications in the order shown as I feel some are more useful than others. There are a number of modifications that can be done to improve the reliability and performance of the ‘C’ Range Triumphs without losing the general character of the bike. ![]()
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