Reversed Heads

What KruZer is saying is the ram effect won't have much effect on a KZ because the aerodynamics spoil the airflow around where the carbs would sit if the heads are reversed. Not that ram air doesn't do anything. To get the full effect I'd have to move the carbs off the heads.

flht1997 wrote:

what year XS are we talking?, all the ones i have had my hands in had multi-piece

Oops. My bad: The one I saw was an 81 and the cam was what was solid and the guy still cut, rotated and rewelded. He made a degreeing plate out of an old CD.

Looks like Yamaha is producing a factory motorcycle with a reversed cylinder head - could be the start of a new trend??

2010 YZ450F:

79MKII wrote:

Looks like Yamaha is producing a factory motorcycle with a reversed cylinder head - could be the start of a new trend??

2010 YZ450F: [img size=600]

Very coolB)

Well you'd have to change the crank, gearing and output drive rotations or some Plummen type rigging...

Whoa, front nose wheelies... Ewwwwwwwww, someone start a posting!

how about just disconect the rear drive chain on a rokon :laugh:

PLUMMEN wrote:

how about just disconect the rear drive chain on a rokon :laugh:

LOL :laugh: Sweet!

Ram air on modern sportbikes works because it goes into an airbox. If the carbs were in front, you would have to have an airbox up front to make it work. A lot of work was done with this in a wind tunnel.

As for the fuelers, Elmer told me himself there was no advantage other than maintenance. When they first did it, they were using positive displacement blowers. Only so much air moves from one side of the blower to the other side with each revolution, regardless of how much you try to ran thru it.

Like I said before. I don't care about the ram effect or ease of maintenance. I just think it's the tits.

Seems like a perfectly good reason to give it a try.

79MKII wrote:

Looks like Yamaha is producing a factory motorcycle with a reversed cylinder head - could be the start of a new trend??

2010 YZ450F:

That was done for mass centralization.......and marketing.

It was also done to give the intake a straighter shot into the combustion chamber.

Becker wrote:

It was also done to give the intake a straighter shot into the combustion chamber.

There are many inherent advantages to the design. I was only pointing out the main reason Yamaha went with this design.