Has anyone cc'd a stock 64U head?

Joined
Nov 25, 2019
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North East Pa
#41
Nice try Bro but you're still wrong.

Disassemble the Exhaust System and you will see that it is in fact a Double-Wall System aka Jacketed Pipe aka Dry Pipe.

And the 1/8 Fitting from the Head to the Stinger is water injection.

Too much confidence and pride can prevent a Man from seeing the facts.
Three points:

The first, JC SuperJet is correct that this is a dry exhaust. I stand corrected.

The second, the 1/8" fitting from the head is not the primary source of water injection, it is a vent. There are multiple passages in part number 29 in the diagram above that provide the water flow through the exhaust.

The third, none of you could give me an accurate number for the title of this thread, a question I asked 3 weeks ago.

 
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waxhead

wannabe backflipper
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Jan 15, 2006
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gold coast
#43
Three points:

The first, JC SuperJet is correct that this is a dry exhaust. I stand corrected.

The second, the 1/8" fitting from the head is not the primary source of water injection, it is a vent. There are multiple passages in part number 29 in the diagram above that provide the water flow through the exhaust.

The third, none of you could give me an accurate number for the title of this thread, a question I asked 3 weeks ago.

That's because unless you are building a lites boat no one cares. No one on here races the lites class its a free-ride/freestyle site. we simply pull the head off throw it in the bin and get an aftermarket head that holds the cylinder together. The 61x cylinder is known for its ability to crack when you start making power.
 
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#45
And you deleted the post where you stated the front and rear domes had a different volume. Then said this. All I was looking to do was verify what "stock" was. Never mind, I found out what I needed to know.

My bad I was looking at this and seeing 760 head not stock 701 head. yes I have cc.ed a stock head and no i am not saying which model comes with a smaller cc chamber because that's a trick in lites racing
 

waxhead

wannabe backflipper
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gold coast
#46
And you deleted the post where you stated the front and rear domes had a different volume. Then said this.
yes Chris because I was talking about a 760 head where the compressions are different and there is certain castings that have a smaller combustion chamber that are legal in lites class racing, like putting a gx160 head on a gx200. What are you actually here for on this site ?? is it to puff your chest and try to prove something. You have already had a go at me in a private message for some reason to which i just deleted your instant message. Let it go dude, no one gives a toss its a friendly site, go and find one where people can be bothered to argue with you
 
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Big Kahuna

Administrator
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#48
You can be sure if I was racing lites id be measuring every casting I could legally use! I'd probably know a thing or two about gaskets too.
Yup, like finding the thickest base gasket within tolerance, thinnest headgasket, head that has the smallest domes, squish, etc - within tolerance........

Chris, one thing that is very common here, is we are all enthusiast. We all have different strengths of knowledge. And many many times one topic starts off about A, and ends up about D. That is what happened, the topic went from 701 heads to 760 heads. Hence, the conversations about there being staggered dome sizes. Yamaha does this to keep heat down on the rear piston. They found in runabouts (AKA Waveraiders) that the rear pistons would heat up more due to loads to the pump so they lowered the compression and also jetted richer to keep the rear temps down. This is what Wax was referring to... And he is also correct. Most of us dump the stock heads. I have not ran one since 2002 or 2003.
 

hornedogg79

dodgin' bass boats
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Jul 9, 2009
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#49
I made mention early in this thread that I build national level karting engines, I didn't get to this level without testing everything that has ever been written on a forum regarding karting engines.

You better have a really really thick wallet and some patience if you wanna do that here. And the motor is only half the battle.

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