I've got the new Sport Port template

[Matt_E]

Whoa...I wouldn't bore up to 84mm if I were you. You'd probably be safe, but you wouldn't have any (maybe one) overbores left.

 

[Matt_E]

Besides, displacement isn't the end-all answer to power, either.
Unless you get a good deal on either machine work or pistons, you'd spend 250 bucks on boring up. You would also have to get a different head, different domes, or get them machined.

For that type of money, look at dual 44 carbs (for 62T cases), port your cases (almost free!), bump your compression, look for a cheap Total Loss (not likely), or aftermarket reed system.

 

[D-Roc]

well i have extra ada domes to cut, the ski is 11 years old and still running stock bore, and pistons/rings/gasket set isn't to bad $$$ wise. i don't care if i have no more bores after that cause i will eventually be getting a lamey, no time soon but that is a long term plan, so really i think it will be worth boring and freshening up the old jug if i can get another season of riding at 753cc Group K said it was okay to do so i am not to worried about reliabiltiy issues. i guess i see what happens.

 

[Matt_E]

You seem to be aware of the issues....let us know how that runs on 760. Remember, you'll have to cut ALL the ports bigger.

 

[w/rpm500]

Saw this post.. and am new to X-H20 ...(Greenhulk/Riva)
Is there a recomended port template available for the 64x(760)???
Looking for rec to light race porting...93 octane's ok
was told by the tripple crowd at GH's that this was the place to ask for the cutting edge twin cylinder info..

any help would be great!!!

96' GP760 - R&D rec head,PRO-TEC pipe, gp1200 o/e reeds,Riva spacer plate,R&D intake,R&D charging wheel,(soon to be added offset keyway)Tauceti f/a's ,Outerwears, Solas/Island XO, Riva grate,Speedpro plate,Wetwolf AAT.

 

[Freestylin-FX1]

If ya get bored you can come try it on my 61X:hail: :biggthumpup:

 

[WaveDemon]

Saw this post.. and am new to X-H20 ...(Greenhulk/Riva)
Is there a recomended port template available for the 64x(760)???
Looking for rec to light race porting...93 octane's ok
was told by the tripple crowd at GH's that this was the place to ask for the cutting edge twin cylinder info..

any help would be great!!!

96' GP760 - R&D rec head,PRO-TEC pipe, gp1200 o/e reeds,Riva spacer plate,R&D intake,R&D charging wheel,(soon to be added offset keyway)Tauceti f/a's ,Outerwears, Solas/Island XO, Riva grate,Speedpro plate,Wetwolf AAT.

I'm pretty sure the sport port gives you acouple optionsas to the amount of work you do and what rpm it affects. it doesn't do anything for the transfer or boost port, just the exhaust and the bottom of the sleeve.

you should start a new thread to get some good replies.

 

[Matt_E]

There are two different Sport Port templates available. For bottom end, I would pick the newer template.

They are supposed to work for the 701/760.
However, for the 760 I would highly recommend cutting the exhausts wider than the template. The template is made for the more conservative 81mm bore (701). At 84mm bore, the exhaust port must be bigger to keep its relative size in relation to the bore.
The template does not account for that - so the port must be cut bigger than the template.

 

[demolition_x]

hey matt feel like making me a copy of the template?


what did you use to cut it? would a dremel work or are air tools a must?

 

[Matt_E]

Air tools would be nice, but I've done four now on just a dremel.

 

[Phill]

You got number five sitting on my workbench right now:biggthumpup:

 

[Matt_E]

And number six in Char's square.

 

[Phill]

As long as mine comes first

 

[Matt_E]

Well, your's phucked up first. I guess that means I can start working on it.

 

[Snackem]

And number six in Char's square.

I believe that number six is in the back of my truck. . .
:biggthumpup:

 

[Matt_E]

Gah! Make that seven.

 

[Snackem]

:biggthumpup:

 

[Matt_E]

I've got more work this winter than I realized.

 

[Rickster]

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

 

[Matt_E]

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