Kawasaki 125 cc GTO Mach 4

The next i was waiting for…
125CC
18 HP
Rotating valve for fuel intake…
Having it stripped and cylinder in the shop for over bore, + 2.00 mm


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This one will have to take the place from the chinese lifan 4stroke engine on the trike…

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Koen, a two stroke rotary valve engine on the charcoal powered trike! Guess it has oil injection, too?

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Hi Ray, yes it has, tomorow will post some pictures from the insides of the engine

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Sizing up, will fit the frame, measuring the volume in the cylinderhead.

Overbore 2.0 mm, adding about 8 cc to the 124cc original, bringing the total to 132 cc
2 stroke , with rotating valve and oil injection :grin:
Cylinderhead , nice quenching shape, volume 13 cc
Gasket and distance from piston, aprox 0,8 mm, to be modified…

Can’t wait to hear this one roar…
Payed 80$ for the entire bike, and 15$ for the overbore work, including piston, gasket and pistonrings…



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“2 stroke , with rotating valve”

Is there any way to get a picture of the valves?

Hi Brian,
There is 1 rotating valve inside, here are some pictures i got from the internet.
It works as a kind of a slide/door to open or close the entrance for the fuel mixture.

The advantage is the ease to modify and it has less restriction compared with the reedvalve




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Does anybody know what “GTO” stands for without looking it up. Remember, the first GTO was Italian.

Grand Theft Otto ? :grin:

Or Grande Tourismo Originale ?

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Grand Tourismo Oh i forgot

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Just woundering how long them rotating valves have been used,and are they hard too rebuild too keep valve clearance proper? Thanks,nice engine photos.

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