- Thread starter blaster1990
- Start date

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If you planning to abuse the engine go with something other than the Vito crank.

you can pick one up from ebay for 150ish, they say it adds 4hp, I don't think it is quite that much, but definitely better throttle response.

CAUTION THERES A sh*tLOAD OF MATH AHEAD!

yes indeed it does add more horsepower but not 4hp like the manufacturer tells you. i will break it down for you. the stock crank is 57mm a +3mm crank makes ur crank 60mm

66mm bore converted to inches = 2.598 inches

57mm crank converted to inches = 2.244 inches

2.598 inches x 2.244 inches = 11.8957280573236 cubic inches

1 cubic inch = 16.387064 cubic centimeters

apply that formula to the above product (11.8957280573236)

1 cubic inch x 16.387064 = 16.387064 cubic centimeters

11.8957280573236 cubic inches x 16.387064 = 194.9360381379971 cubic centimeters

194.9360381379971 ͌ 195cc

round 195cc and you get a stock yamaha blaster 200! (blaster 195 doesnt sound catchy lol so they rounded 195 up to 200 and also so it fits into the 200cc class)

now thats stock and that 195cc puts out ͌ 20hp

round 195cc to 200cc as yamaha did

now divide 200cc by 20hp

200cc / 20hp = 10cc

thats ͌ 1hp every 10cc

so the displacement to power ratio is 10:1

convert that to inches

60mm crank shaft = 2.364 inch crank shaft

now the bore size is constant so we can leave that the same as before.

bore x stroke = cubic inches

2.598 inches x 2.364 inches = 12.531863247554806 cubic inches

convert the 12.531863247554806 cubic inches to cubic centimeters by applying the formula i have provided above in blue.

12.531863247554806 x 16.387064 = 205.360445076928449429584 cubic centimeters

once again do your rounding

205.360445076928449429584 = 205cc

displacement to hp ratio is 10:1

so with +10cc you get aproximatly

in combination with a bored cylinder and a big bore kit and a milled head there is no ending to how much horse power you can put into this thing.

posibilities are endless, so is math.

but if you look at the whole picture 20hp is awfuly low, yet keeps you satisfied, now 21hp will make it that much more satisfying!

please correct me if i am wrong with any of my calculations after all i did not use a calculator!=))

i hope i helped

A

if 195 CCs produce 16 hp, which is stock then 205 CCs should produce 16.8 hp. rounded up it's 17, or +1.

again, i didn't mean to correct you, but in that one equation, there was a missing inch and i stared at it until it drove me nuts and i had to find it. all the numbers match up though. im surprised that a stroker only adds 1 hp.

and you may need to cut out the cyilinder skirt as well on some +3 or +4 cranks.

although vito's only offers as high as +3

hot rods offers a +4