Hayabusa and sv piston size, cylinder and clearnace information

Hayabusa gsxr1300 00-07 piston swap for the sv.

Im posting this just in case any one else wants it.

this will help with honing the cylinder to get the correct piston to cylinder clearance.

BUSA piston and bore

cylinder bore: 81.000-81.015 (3.1890 - 3.1896in)
Piston size: 80.970 to 80.985mm (3.1877 - 3.1883in)
piston service limit: 80.880 (3.1842in) at 15mm (0.6in) from skirt end at 90o from pin
Piston to cylinder clearance: 0.020 - 0.030mm (0.0008 - 0.0012in)

SV piston and bore

Cylinder bore: 81.000 - 81.015mm (3.1890 - 3.1896in)
Piston size: 80.940 to 80.955mm (3.1865 - 3.1871in)
piston service limit: 80.880 (3.1842in) at 20mm (0.78in) from skirt end at 90o from pin
Piston to cylinder clearance: 0.055 - 0.065mm (0.0021 - 0.0025in)



you need to run the sv Piston to cylinder clearance when using the busa pistons this means the sv cylinder bore need to be increased with a hone.

this all means that from the smallest cylinder size of the sv and the smallest piston size of the busa the hone that is needed would be 0.030mm (0.0011in) giving 0.060mm (0.0023) piston to cylinder clearance. This will change from piston to piston and cylinder to cylinder so get them measured when doing the hone and work out the correct clearance.

please correct me if im wrong on any thing thanks.

some more info

you will need 2 pre 2008 gsxr 1300 pistons and 2 pin's and 4 cir clips

2 cylinder head gaskets (front, back) and 2 cylinder base gaskets (front,back)

2 sets of sv piston rings

sv cylinder hone dependant on the exact measurements of the cylinder and piston, for measuring the piston follow the instructions from the hayabusa menu.

you do not need to drop the engine.

you need to remove throttle bodies/carbs, exhaust. to get aces to the cylinder's and heads

i will update things when i actually do the swap.

[svsam]

does it make that much of a difference?

Ditto, What will this give the bike out of interest?

Most likley wont be that much but with the combination if mods that im doing it will all add up

the pistons are 17g lighter each so you have less recipicating mass to there is less load on the crank, it aparently helps the engine spin up faster, obviously means its in the power band quicker.

while im at it i will be thining the head gasket to raise the compresion, and slotting the ignition pick up as well. and with the rest of the mods should have a healthy increase in power across the range.

So as if you was fitting a lightened flywheel?

Originally Posted by widget

So as if you was fitting a lightened flywheel?

Yes, but most of the lightend fly wheels mean i have to run a constant loss charging system (unless some on knows of a way to lighten it without losing the charging system)

[squirrel_hunter]

Why are you using SV piston rings?

[yorkie_chris]

Originally Posted by widget

So as if you was fitting a lightened flywheel?

Rotating mass vs reciprocating mass...

[yorkie_chris]

Originally Posted by squirrel_hunter

Why are you using SV piston rings?

'Busa has electroplated ally cylinders, SV has steel liners.