Kawi2strokes.com Forum

as we know there're not enough room for the transferts on H2, so on KR the intakes and exhausts ports are not fixed at 90 ° compare to the crankshaft inside the crankcases but are nearly perpandicular to the crankshaft inside the crankcases. This helps a lot to have bigger rooms for the transferts ports.
Notice also that the intake ports are very closed from the bottom of the barrels this means the pistons at the bottom dead center are really on the bottom of the barrel sleeve. This explains why there is bridgeport on the intakes.
As you know Suzuki did the same on his GT 750 2 stroke

Notice also there're six studs on the exhausts side on which the engine is hoter so the barrel can be deformed and only four studs on the intakes side

Hmmm, nice transfers, (I'll take 2 sets, please...!)

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"One day, your life will flash before your eyes. Make sure it's worth watching." : anon.

Rod, sorry have only on set apart my engine with a brand new head still in the plastic with a sticker with the part number on it like any Kawasakki parts

You are out of my will, J.P.

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"One day, your life will flash before your eyes. Make sure it's worth watching." : anon.

Yes, the transfers, for all intents and purposes, are somewhat larger, but, not better than H2R attempts. The actual aiming angles into the bore are not as good as they should be, and there really isn't enough room to make them much better.

Although volume helps here, aiming the mixture into the right places when the loop scavenging occurs, is paramount to getting a two stroke to be efficient in transfer operations. If the angles, and mixture paths are not advantageous, short circuiting will occur if the angles are too acute, which moves transfer mixture not to the correct place in the cylinder, but straight out the exhaust. This leans the fill to the rear of the loop, leaning the captured mixture out, no matter how the jetting is.

In my files, I have a port angle study between the H2R and KR759 vs TZ 700/750, vastly different, even with the reeds on the Yamaha, transfer angles significantly different.

Just "hoggin' them transfers out" makes more problems than helps.

JP, if you would PM me with a real world email address, I will send you that page.

Talk about a brick O Aluminum..........

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........

Dave my personnal email adress is on my profile

John not only a brick...

Very Cool JP and thanks for posting, neat to see such a rare piece

THX Phil

The earlier KR cylinders have a bridged exhaust in addition to bridged inlet. I'll take a couple of pics tomorrow.

Neat!