Double Zero Cylinders

[the only couch rider]

i sleeved mine after i stuck the motor a few times... hell of a lot cheaper getting them sleeved once and then being able to hone it vs. getting em recoated

 

[Matt_E]

Yup. But beside the point.

 

[the only couch rider]

i know you were clarifying for those who did not know

 

[Matt_E]

LOL....we are doing awesome chasing each other around this.

BTW, I have heard about folks sleeving those Nikasil bores for cost reasons.
Engineered heat removal comes up as a concern.

 

[the only couch rider]

i had dual cooling inputs and enough pissers on it that it was cool..... i had two sets of triple pissers running right below the hood on each side on the gp800, looked cool and was functional

 

[Mile9c1]

Why would Yamaha care enough to measure the port mismatch and even more suspicious, take the effort to stamp it onto the cylider? It's gotta be about the bore size because the GP800's have the same numbers and they don't even have sleeves (like couch rider said, the pistons come is sizes A, B, C, and D).

 

[Matt_E]

Why would Yamaha care enough to measure the port mismatch

Bingo.

Perhaps the cylinders with 00 piston clearance have that clearance because they are fitted as designed into the casting. Means least clearance, and incidentally, best port match.
Just a W-A-G

 

[waxhead]

lets think about this
these cylinders are die cast
you cant get that much core shift
I have a set of 00 cylinders in fact i have had a few
they are no better than any other ones i have seen in fact one of them was the worst until i ported it

 

[WFO Speedracer]

Does this mean this commandment has to be stricken from the Superjet bible?

 

[Matt_E]

I've always questioned the truth behind it. Perhaps Travisty could enlighten us, the lost.

 

[the only couch rider]

we can blame this all on butch the parts whore..... he started this whole thing just so the value of the parts he has goes up

 

[MADMAT]

So we still know nothing for sure about the meaning of 00?

Their has to be something to it. I got mine on a full blown race SJ.

I can say the ports are WAY cleaner on the 00'S than they have been on the 4 or 5 other cylinders I have seen in my lifetime. They line up perfectly.

 

[Matt_E]

But why would Yamaha care enough to stamp that on there?
Can you say with absolute certainty that the sleeve has not been ported? Or perhaps removed and put back in with better alignment?

 

[MADMAT]

I don't know. That makes no sense to me at all.

 

[the only couch rider]

So we still know nothing for sure about the meaning of 00?

Their has to be something to it. I got mine on a full blown race SJ.

I can say the ports are WAY cleaner on the 00'S than they have been on the 4 or 5 other cylinders I have seen in my lifetime. They line up perfectly.

was this a ltd. or superstock set-up?

 

[SJet]

So we still know nothing for sure about the meaning of 00?

Could these numbers be refering to the specific die cast machine they came from. I am sure they use more than one machine?

 

[EvanB85]

Could these numbers be refering to the specific die cast machine they came from. I am sure they use more than one machine?

I don't know anything at all about the above conversation, but this last statement seems pretty logical to me.

 

[MADMAT]

was this a ltd. or superstock set-up?

I would say it was a SS just before I got it. I'm not 100% sure though.

When I got it had these new 00 cylinders with heavily ported cases, worked carbs (by full spectrum I think), girdled head and a speedwerx dry with a 14.5/18.5 prop amd front sponsons. What are (or were 4 years ago) SS set ups like anyway?

I think they toned it down to sell cuz the domes I had in it only produce like 15psi but it still went damn near 58MPH or so (guess)

 

[Matt_E]

I don't know anything about race rules....does SS preclude cylinder porting? (If so, why does it allow case porting???)

 

[the only couch rider]

the basic difference between an s/s and ltd. set-up is porting and total loss