Kawi2strokes.com Forum

Most of you know I've only had the s3 for a triple for years. I have an h2, well most of it , and am now working on it here and there. There's plenty of similarities about it being a triple compared to mine, but little nuances learned working on these things sometimes intrigues me.

I was prepping the cases on this h2b and noticed that behind the cylinders is an oil channel similar to the s3. When I tore it apart, I just scraped the gasket and blasted it. I looked at the oil tap and the channel and notice the port was cast, to a point where you can see the engine was casts that way to machine it, but they never tapped on this case. Interesting, wonder what advantage carb bowl mixing had preferred to intake injection like the s3? Better yet, would tapping it in and using another pump be an option over bowl mixing?

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74 H2B with reeds and 34mm carbs
75 S3A Ram Air with reeds and 30mm carbs
73 S2A (wife's bike)
71 Yammi RT1B
83 HD Sportster
03 Yammi R1
06 Kaw 750 Vulcan (wife’s bike)
12 Yammi vstar 250 (wife’s bike)

I believe you will find it's tapped but the threads will be deep in the hole (actually they all are), it still feeds to the crank but you can see there is no hole from the oil groove in the base gasket surface to intersect the bolt hole. Flip it over and take a pic of the upper crank journal, there should be a hole that goes up to each bolt hole.

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We don't need no stinkin' Cams!

I see the cases are tapped all the way to the journals but on this engine, 3 other lines were ran to the carb bowls to premix the gas. I'm curious if the engine cases were cast to do intake injection, why was it changed to carb bowl mixing? I see the hole to the journals is too big to provide pressure on the same line to also accommodate intake injection. Was it done like this because the crank bearings were being starved or intake mixing wasn't providing enough lube to the pistons? I reckon they tried restriction jets to the crank bearings to get enough pressure to push up to the intake channel.

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74 H2B with reeds and 34mm carbs
75 S3A Ram Air with reeds and 30mm carbs
73 S2A (wife's bike)
71 Yammi RT1B
83 HD Sportster
03 Yammi R1
06 Kaw 750 Vulcan (wife’s bike)
12 Yammi vstar 250 (wife’s bike)