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Ya, I know I went off topic there. LOL
Next to Motorsports Diving is my passion.
Of topic once more.
Sharks don't scare me as they have a predictable behavior.
Dove with lots of Banded sea Crates in Fiji. more venomous than a King Cobra, but very docile as they could be easily handled. Not to mention the Deadly Textile Cone shell's, he stings you and you wont make it to the surface alive. But there were White tips, Bronze Whalers, Bulls no big deal they just swam away as you try to get up close and personal.
Barracudas concern me, they are very curious, and a flash of Bling may make them strike,
Moray's have terrible eye sight, but a keen sense of smell, keep fingers away.
A most memorable moment in CZM was diving, North end for lunch we speared a 4 foot Nurse shark. that boy did a death roll like a Gator, Broke the spear gun in half and the spear as thick as Rebar bent it in half, took two of us two bring him up and he became lunch. Skin so tough I was unable holding him to the bottom to penetrate it.
Went thru 2,800 psi at 60 feet in 10 minutes.

No replacement for Displacement!
This going way off topic for the guy just wanting to know how big a stroke he can stuff in his Fiddy.
Piston volume in terms of cc's either + or - only is effecting compression ratio, not bore size and swept volume (stroke). Same with combustion chamber volume,Head gasket thickness.
With the Plethora of aftermarket heads on the market you can pick and choose a combination for you specific application. This generally will be dictated by the cam shaft your going to run as it has comp.ratio and rpm range it will work in. Flat top piston=best flame travel, Mini dome(+.110 Brodix NASCAR) yields the best flow. Give and take.
For a national event in my KT100 on Methanol I obtained from Funny
car driver Mark Oswald, a gallon of the Nitromethane (the POP) in this application was a very high rpm motor but low 9:0-1 comp. ratio.
1989 was $70. per gallon. Holly Schmolly was it the POP! Very weather Sensitive ran it in a morning heat race and had to turn the main out during (Walbro) the race to keep the engine cool, skipped it in afternoon heat race, Put it back for the final and spanked e'm
Cost a ring as the heat made it lose its temper by the end of the race. But for a National win was worth it.
Good day.

With such a long stroke to obtain the desired CC's beware of the Harsh rod angle of the stock length connecting rod.
Crank Works can prolly make any stroke you want.
I left out with such a long stroke to obtain desired cc's, being a noob I have not had the pleasure of measuring the piston for wristpin offset.
A straight up pin would be a real bad buzz with a stock rod and long stroke. should require 1mm pin offset.
research Rod to Stroke ratio's.
Good Day!

Very well stated Bashan.
My first experience with Ethanol was back around 89 or 90 my first Summer in Texas.
It was either a Texaco or Marathon station across the street that I found my first gas with ea10.
I had brought down a Yam.XT350 for some off road riding, got so hot in the Summer (102-104) outside and in my warehouse was 4-7 degrees hotter. No need to say at the end of the day I was not hopping on the XT for a ride.
It sat for two months, when I went to start it did the classic only ran on choke. I yanked off the carb to find the brass alloy main jet had this huge green Christmas tree of corrosion hanging out of it. never seen anything like it to that date.
You are correct, best policy is to keep them running and or drain the fuel bowl.
Good Day!

Agreed on the Headlights. In Fort Worth not a issue as under street lights most of the time, But in NC and Ohio even at 55mph I keep seeing a mirage of a Black Angus cow or a Deer.
Working in the 80's with some Thompson Ohio EMT's hitting either one at 55 is a real bad buzz. I upgrade all my Street rides to (excuse me) Illegal wattage PIA's. at speed on a Sport ride doing the legal limit I find I can see down the open road so much further. Than if ya wanna talk at 150-170+ mph its a Necessity to feel comfortable.
1st gear on My CBR is 82mph.
Good Day!

I see Yamaha dropped la Bomba on the Brazilian market today with it's announcement of the 2013 YS150 Fazer Blue Flex.
Built to run on Gas or Ethanol or a mix, Air cooled Fuel injected.
150cc is the most popular Brazilian class sold there.
in 2012 1.65 Million units sold.
Yamaha expects to sell 190,000 units by year end.
Great move by Yam to bring out a Gas/Ethanol 150cc.
I'm sure it cost much more than my Sunny 150-A, But it can handle the Dreaded Ethanol woes.
Good Day!