Engine Replacement
 

Could somebody please recommend a more recent motor that will fit into the 1VJ frame.

The 3AJ will fit - '88-'90 twin-headlight version of yours. Benefits from better cooling and I think stronger 5th gear or at least better lubrication. Difficult to get hold of an engine without buying the whole bike though.

XT660's will not fit without fabrication work. Pre-'90 TT600s should fit, later model TT600s will not as the engine is slimmer.

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Barry
3AJ Tenere

any e-start xt600 engine will fit.
but watch out - 1990 yamaha has changed ignition system to battery ignition (3TB/4PT/DJ02 models), so you have to keep the old alternator or change the whole electrics.

regards
klaus

If I was to find a 3AJ motor, what sort of price would I expect to pay for it?