I've got the new Sport Port template

[sjetrider]

Do you re-pitch the top of transfer ports too or just match them up at an angle? Also have you ever dropped the boost port and drilled boost holes in pistons? If so, what effect did it have if any? We did this on a highly ported 61X cyl. this week end but have not assembled and run it yet? REAL curious to see if we f-ed up a good ported cyl.

 

[Matt_E]

I do not repitch the roof angles. The stock Yamaha port angle config seems to be great for low end. I confess, I don't know enough about it to mess with it.
On my current personal cylinder, I did make the transfer port windows themselves quite a bit wider.
In fact, my personal cylinder is ported way beyond what the Sport Port does. I have ported my cases, as well.
Nice setup. Hits great.
I have seen the dropped boost ports a few times, but have not done that yet. I understand that it promotes cooling of the piston from below (this is in conjunction with boost ports in the piston skirt).
I did some research on this and found nothing conclusive for performance gains here - I think it's done mostly for reliability, added lubrication and cooling.

 

[Phill]

I sure hope you are charging for this... Especially Phill...:biggthumpup:

HEY!! SHUT UP!!!!!!


Dont put ideas like that in his head!!!

 

[Phill]

I wish....I think his cyl is probably my best work to date.

And dont you forget that either!

 

[Matt_E]

Where's my throttle cable, Dork?

Nice sig, btw.

 

[Phill]

Yours? Is it not on my ski?

 

[Matt_E]

No...your throttle cable is sitting in the garbage bin in my garage.

 

[Phill]

I thought we traded.....

 

[Matt_E]

You thought wrong...especially once I found out in what nice & new condition that throttle cable of mine that you took was/better still is.

I do need it back...Char keeps asking about it. You got a replacement for your ski. And yes, I do want THAT cable back. :fingersx:

 

[Phill]

OK........I'll take it off today.....Trust me.......it'll be in the mail first thing in the morning

 

[Phill]

Were kinda off topic now......

 

[Matt_E]

Yeah..back on topic. What cyl am I going to do first?

 

[Phill]

mine

 

[Matt_E]

Which one of yours?

 

[Phill]

The only one that needs work......

You already said the other one is better than yours.

 

[Matt_E]

No...there's the one of yours in my garage, and the one still in your garage.

 

[Phill]

Well......I forgot about that one.......I guess you have two hands for a reason....

 

[w-nut]

has any one tryed the sport port on a 750 kawi motor , i just orderd a set off templates to do mine so am kinda curious if any one else has tryed one on a 750

 

[Matt_E]

NO one I know...but please update this thread with results!

 

[w/rpm500]

Ordered GP760 template...