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Old 11-10-2012, 06:01 PM   #144
FJ_Kevin OP
Gnarly Adventurer
 
Joined: Dec 2010
Location: Maryland ==> originally from Long Island
Oddometer: 340
Example of some modern big bore cylinders...

I did a search for big bore MX cylinder to see have far things have come since the OW and YZ465 days.

Here are some examples to compare with the previous post.

First is this aftermarket cylinder for the Honda CR500. Observations include,
- Large “OW” style intake to transfer ports (missing in the YZ465)
- No case induction port.
- Water cooling
- Exhaust power valve
- Two small auxiliary exhaust ports
- Six transfer ports plus boost ports (from the intake)




The Kawasaki KX 500 cylinder is also impressive.

It has,

- Large “OW” style intake to transfer ports (missing in the YZ465)
- No case induction port.
- Water cooling
- Exhaust power valve
- Auxiliary exhaust ports
- Four transfer ports plus boost ports (from the intake)



And finally, here is a radically ported Yamaha snow mobile cylinder



Ok, so here are a few oldies!

I raced against #622 in several classes during the '70's. Here he is at Bridgehampton in 1978
He was a really nice (and fast) kid!



And a photo of another good friend taken in 1979... now we ride together again as old guys!



This is me on taken on the same day and place as above. Looks like we are taking different lines.

__________________
My '81 YZ465 Factory Race Replica
http://www.advrider.com/forums/showthread.php?t=772033

My Vintage Husqvarna/Motocross Restoration Extravaganza Thread
http://www.advrider.com/forums/showthread.php?t=964670
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