[2][5] In 1971 the Ram Air System cooling duct, as used on the GT380 and GT550, was added to the cylinder head.

It is debated whether the Ram Air System improved cooling significantly or was a cosmetic addition.

The new engine used Suzuki's dual induction system, first used on its off-road bikes.

The system used both piston porting and reed valves,[7] which gave better response through the rev range.

Fuel was delivered by twin 26 mm Mikuni carburettors, which had restrictive slides to reduce intake noise.

[10] The front brake was replaced in 1972 with a single disc,[1] which suffered poor wet weather performance.

[1] Introduced to the Japanese domestic market only in 1971, the model was based on the T250 and had styling similar to the T350.

The exhausts were modified to comply with noise and emission regulations which reduced power.

[1] An updated engine was introduced in 1976 with a 4 bearing crankshaft, 2 extra transfer ports and larger carbs which increased power.

[1] In the UK the model was heavily advertised with the then 500cc world champion Barry Sheene heading the campaign.