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Buzglyd · 06-13-2008, 02:26 PM

I think the recent advancements in 2 stroke outboard motor technology include switching to 4 stroke.

Needless to say, I'd buy one of these in a heartbeat. My guess is that it will never see the light of day.

Administrator · 06-13-2008, 03:28 PM

Original Article:
2009 Yamaha RD350 Concept

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peter83 · 06-13-2008, 07:30 PM

RZ350 motors were 64mm x 54mm, the cylinders in the illustration seem to have a shorter stroke, any guesses about intake reeds/rotary valves?

BrowningBAR · 06-13-2008, 08:39 PM

Man, that looks like it would be a whole lot of fun. I agree with Buz; we'll never see it produced, though.

sarnali2 · 06-14-2008, 06:46 AM

I think the coolest sound in the world is a 501 Maico. Hearing one winding out, with the lingering smells of Blendzall, cut grass and cow poop in the air on a chilly wet morning....what a lucky time to be a kid. I think the only thing better would be to watch and hear a squadron of Spitfires take off from a grass field.

mscuddy · 06-14-2008, 08:00 AM

If it burns oil, it'll never fly. Snowmobile or no snowmobile tech.

...how many times MUST I remind everybody that the two stroke will never be "emission legal" until they resurrect the "Orbital" two stroke design that Ford killed off in the mid 80's (that they put in Escort rally cars).

Two stroke top end, pressurized intake injector, exhaust port with a dry-sump 4 cycle type lower end. Doesn't burn any oil in the combustion process.

The Ford Escort put out over 200 HP, and the entire motor assembly weighed about 120 lbs.

I could go on about the Detroit 2 stroke V8 diesel, but no one would listen...

Buzglyd · 06-14-2008, 08:19 AM

Quote:

Originally Posted by mscuddy

If it burns oil, it'll never fly. Snowmobile or no snowmobile tech.

...how many times MUST I remind everybody that the two stroke will never be "emission legal" until they resurrect the "Orbital" two stroke design that Ford killed off in the mid 80's (that they put in Escort rally cars).

Two stroke top end, pressurized intake injector, exhaust port with a dry-sump 4 cycle type lower end. Doesn't burn any oil in the combustion process.

The Ford Escort put out over 200 HP, and the entire motor assembly weighed about 120 lbs.

I could go on about the Detroit 2 stroke V8 diesel, but no one would listen...

I remember the Orbital. It was made by an Aussie company I believe.

mscuddy · 06-14-2008, 08:28 AM

Yeah, think it was an Aussie division of Ford that perfected it. Used a roots-type supercharger to pressurize a bottle that was hooked up to the intake injector. You had to spin the motor for a few seconds to get the psi up, then the motor could start. In some twist of fate, GM bought the patent from Ford, and killed it off. Guess having a motor last for 20 or so years with no major repairs in a no-no in the eyes of car manufacturers. Like the saga of the slant-six, there's little recovery in manufacturing costs or spare parts and repair $$$$...if it don't break down.

bmwclay · 06-14-2008, 04:37 PM

Bring em' back I say. I bought a Mach IV complete with expansion chambers just to piss off the next door Harley guys. Hey, if they can drop the clutch at 2am when the bars close, I guess its ok for me to wheelie down the street at 5am going to work.

newagetwotone · 06-14-2008, 06:32 PM

Love it, looks beautiful and would be wonderful if it got here... To be honest i'd welcome ANY sports bikes/naked bikes between 250 and 600(Two or four stroke) there really isn't much choice in that area, Personally i'd love to have an Aprilla RS500.

06-13-2008, 03:28 PM	#2
Administrator Administrator Join Date: Mar 2007 Location: On My Bike Posts: 0	2009 Yamaha RD350 Concept Original Article: 2009 Yamaha RD350 Concept Please discuss the Motorcycle.com article 2009 Yamaha RD350 Concept in our Motorcycle Forums below. Use the reply button to let others know your comments or feedback on the article. Constructive criticism is always appreciated, along with your thoughts and personal opinions on the bikes and products we have tested.

06-14-2008, 06:46 AM	#5
sarnali2 Aging Cafe` Racer Join Date: Jun 2007 Location: Sittin' down by my window, lookin' at the rain. Posts: 8,647	I think the coolest sound in the world is a 501 Maico. Hearing one winding out, with the lingering smells of Blendzall, cut grass and cow poop in the air on a chilly wet morning....what a lucky time to be a kid. I think the only thing better would be to watch and hear a squadron of Spitfires take off from a grass field. __________________ "Carpe` Throttelum -Loud Suits Save Lives" "Denser alloy. My Father gave it to me, I think he wants me to kill you"... CVF-FCV

06-14-2008, 08:00 AM	#6
mscuddy MODERATOR X Join Date: Jun 2007 Location: Next to my still checkin the temp. Posts: 5,447	Oh fer chissakes... If it burns oil, it'll never fly. Snowmobile or no snowmobile tech. ...how many times MUST I remind everybody that the two stroke will never be "emission legal" until they resurrect the "Orbital" two stroke design that Ford killed off in the mid 80's (that they put in Escort rally cars). Two stroke top end, pressurized intake injector, exhaust port with a dry-sump 4 cycle type lower end. Doesn't burn any oil in the combustion process. The Ford Escort put out over 200 HP, and the entire motor assembly weighed about 120 lbs. I could go on about the Detroit 2 stroke V8 diesel, but no one would listen... __________________ A gun is a tool, Marian; no better or no worse than any other tool: an axe, a shovel or anything. A gun is as good or as bad as the man using it. Remember that.

06-14-2008, 08:28 AM	#8
mscuddy MODERATOR X Join Date: Jun 2007 Location: Next to my still checkin the temp. Posts: 5,447	Yeah, think it was an Aussie division of Ford that perfected it. Used a roots-type supercharger to pressurize a bottle that was hooked up to the intake injector. You had to spin the motor for a few seconds to get the psi up, then the motor could start. In some twist of fate, GM bought the patent from Ford, and killed it off. Guess having a motor last for 20 or so years with no major repairs in a no-no in the eyes of car manufacturers. Like the saga of the slant-six, there's little recovery in manufacturing costs or spare parts and repair $$$$...if it don't break down. __________________ A gun is a tool, Marian; no better or no worse than any other tool: an axe, a shovel or anything. A gun is as good or as bad as the man using it. Remember that.

06-13-2008, 02:26 PM	#1
Buzglyd Founding Member Join Date: Nov 2001 Posts: 10,857	I think the recent advancements in 2 stroke outboard motor technology include switching to 4 stroke. Needless to say, I'd buy one of these in a heartbeat. My guess is that it will never see the light of day.

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06-13-2008, 07:30 PM	#3
peter83 Founding Member Join Date: Nov 2001 Posts: 3	RZ350 motors were 64mm x 54mm, the cylinders in the illustration seem to have a shorter stroke, any guesses about intake reeds/rotary valves?

06-13-2008, 08:39 PM	#4
BrowningBAR Snuggles Join Date: Jun 2007 Location: In a really, really, really old farmhouse Posts: 4,369	Man, that looks like it would be a whole lot of fun. I agree with Buz; we'll never see it produced, though.

06-14-2008, 04:37 PM	#9
bmwclay Founding Member Join Date: Jun 2007 Location: Bay Area Posts: 140	Bring em' back I say. I bought a Mach IV complete with expansion chambers just to piss off the next door Harley guys. Hey, if they can drop the clutch at 2am when the bars close, I guess its ok for me to wheelie down the street at 5am going to work.

06-14-2008, 06:32 PM	#10
newagetwotone Registered Member Join Date: Jun 2007 Posts: 1,302	Love it, looks beautiful and would be wonderful if it got here... To be honest i'd welcome ANY sports bikes/naked bikes between 250 and 600(Two or four stroke) there really isn't much choice in that area, Personally i'd love to have an Aprilla RS500.