Author Topic: YZ 465 porting job ??  (Read 3416 times)

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Offline T.RexRacing

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Re: YZ 465 porting job ??
« Reply #20 on: September 22, 2014, 04:18:24 AM »
Not mine. Just a photo of a CR500 cylinder w/aluminum liner plated. It is sweet though.
Whatever you do will be insignificant, but it is very important that you do it.
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Offline Griffo

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Re: YZ 465 porting job ??
« Reply #21 on: September 22, 2014, 09:24:56 PM »
The water cooled jug has a billet 2 piece liquid cooled head to match.

I'd be wary of removing the bridge at the rear of the cylinder.
I was planning on doing the same to my 465, but was warned off of doing it, as it apparently is very load bearing, as well as reducing piston wear.
SV1000S K3, IT465H x3, MX80, DS80, YZ250 09, YZ250 85, + a couple of Dirt Turtles...

Offline Zrt1200

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Re: YZ 465 porting job ??
« Reply #22 on: September 22, 2014, 09:32:32 PM »
The water cooled jug has a billet 2 piece liquid cooled head to match.

I'd be wary of removing the bridge at the rear of the cylinder.
I was planning on doing the same to my 465, but was warned off of doing it, as it apparently is very load bearing, as well as reducing piston wear.

Griffo, I understand what you are saying about load bearing but I dont think the piston skirt is using that area for a load bearing surface at all. In sled engines with just keep 2mm of width on the piston skirt on each side of the intake for load bearing. Every thing else gets removed for more power. I have never had a problem doing that. Its your cylinders guys so do what you think is best. I was just giving you the option for more power. Al
Current bikes, (82) IT465J, (85) IT200N, (05) GasGas 200, (11) DRZ400S, More photos can be found at.....

http://s582.photobucket.com/user/Zrt1107/library/dirt%20bikes?sort=3&page=1

Offline Griffo

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Re: YZ 465 porting job ??
« Reply #23 on: September 22, 2014, 09:51:32 PM »
I'm not refuting what you are saying, I myself really really wanted to remove it, but in the end I simply radiused the sh_t out of it. Probably flows out of the window and up out the boost port better with the bridge the way I machined it.
The bridge is on the thrust side of the bore, and thus the bridge takes thrust loads from the ring lands as well as what remains of the piston skirt after it is ventilated.
SV1000S K3, IT465H x3, MX80, DS80, YZ250 09, YZ250 85, + a couple of Dirt Turtles...

Offline Zrt1200

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Re: YZ 465 porting job ??
« Reply #24 on: September 22, 2014, 10:55:54 PM »
Griffo, I here you. You could probable thin out the section on the back side of the port to get some add'ed flow.

Al
Current bikes, (82) IT465J, (85) IT200N, (05) GasGas 200, (11) DRZ400S, More photos can be found at.....

http://s582.photobucket.com/user/Zrt1107/library/dirt%20bikes?sort=3&page=1