300/440/550 JS550 Port Questions

[Js550FTW]

Alright,i didnt actually "port" my cylinders, i just ground down the intake studs to a piont, is this ok?

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[jakeallen650]

Tony Tony tony


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[Js550FTW]

Tony Tony tony


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Get outta here jake

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[jakeallen650]

I'll get Alex answer soon


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[Js550FTW]

I'll get Alex answer soon


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K thanks

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[Js550FTW]

Bump

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[restosud]

as long as the ring is still retained you'll be good to go.reducing this bump does nothing for power.

 

[Js550FTW]

as long as the ring is still retained you'll be good to go.reducing this bump does nothing for power.

Why is it even there? To me its just more of an obsticle for air flow. What do you mean ring?

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[Roseand]

Why is it even there? To me its just more of an obsticle for air flow. What do you mean ring?

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Piston ring.

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[Js550FTW]

Piston ring.

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Thanks rosie. But what do you mean retained

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[restosud]

this bump holds the piston ring in position at bottom dead center.it's located were the ring locating pin is on the piston.without this bump,the ring will pop out a bit and snag on the port when going back up.

 

[Js550FTW]

this bump holds the piston ring in position at bottom dead center.it's located were the ring locating pin is on the piston.without this bump,the ring will pop out a bit and snag on the port when going back up.

Thanks how will i tell if it does this

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[Roseand]

Thanks how will i tell if it does this

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Turn the crank a full rotation and see if it pops out /snags .. You'll know.

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[Js550FTW]

What do i do if it snags

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[Roseand]

What do i do if it snags

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Buy a new cylinder

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[Js550FTW]

Buy a new cylinder

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Alright thank ya rosie . A quick question for the ports which ones do i want smooth and rough if any. thanks

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[Js550FTW]

This is bottom dead center. I think im ok?

 

[yamanube]

this bump holds the piston ring in position at bottom dead center.it's located were the ring locating pin is on the piston.without this bump,the ring will pop out a bit and snag on the port when going back up.

Isn't that point at the top of the port?

 

[Js550FTW]

Isn't that point at the top of the port?

Yes it is, i guess thats so it seals the ring all the time and doesnt snag anything. In my picture above. Thats the piston at bottom dead center and the ring is still sealed the whole time. That means my cylinders are ok for use

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[yamanube]

It looks (to me) that the cylinder in your picture is at TDC.