rebuilding my 03, looking for a bit more power and more torque and want some advice... targeting around the 180hp mark if i can do it semi reliably.....
actually i'll just list the spec i'm looking at and let people pick holes in it
i'm looking at doing a 1mm overbore (2mm is max and requires a resleeve i believe?) looking at a JE piston (13:1 ratio) kit to suit or maybe wiseco? cost isn't a big problem here, but CP pistons don't seem to have a listing for the 02/03's.
cometic spring steel head gasket
graves intake cam with new graves springs and new valves.
exhaust match porting, 5 angle valve job (if i can find anyone in Queensland Australia who can do it well)
milled head to increase the compression a bit (not sure how much as i need to check the clearance once i decide on the crank/pistons)
YEC ECU
ram air (boxr or graves)
balanced crank/rods/pistons
maybe a 4mm stroke increase as well (in which case i hope to get some carrillo rods) -or if i can afford it an APE or Graves stroker crank.
(i realise the stroker crank will reduce big end bearing longevity etc)
uprate the gearbox to take the extra load (back cut gear dogs, undercut gears etc etc)
one big question is this, if i do a 1mm overbore (or 2mm with a new sleeve), do i then have to recoat the sleeves with nickasil ? (or whatever yamaha call it)
actually i'll just list the spec i'm looking at and let people pick holes in it
i'm looking at doing a 1mm overbore (2mm is max and requires a resleeve i believe?) looking at a JE piston (13:1 ratio) kit to suit or maybe wiseco? cost isn't a big problem here, but CP pistons don't seem to have a listing for the 02/03's.
cometic spring steel head gasket
graves intake cam with new graves springs and new valves.
exhaust match porting, 5 angle valve job (if i can find anyone in Queensland Australia who can do it well)
milled head to increase the compression a bit (not sure how much as i need to check the clearance once i decide on the crank/pistons)
YEC ECU
ram air (boxr or graves)
balanced crank/rods/pistons
maybe a 4mm stroke increase as well (in which case i hope to get some carrillo rods) -or if i can afford it an APE or Graves stroker crank.
(i realise the stroker crank will reduce big end bearing longevity etc)
uprate the gearbox to take the extra load (back cut gear dogs, undercut gears etc etc)
one big question is this, if i do a 1mm overbore (or 2mm with a new sleeve), do i then have to recoat the sleeves with nickasil ? (or whatever yamaha call it)