[RK-stuntz]

hello,

i want to build a high revving engine with better power output then a stock gsxr600 k4/k5 for my stunt bike.
i did some research and i want to bore the cilinders for gsxr750 k4/k5 pistons 72mm (stock gsxr600 is 67mm).
now the problem: the piston pins are bigger on the gsxr750 pistons and there is no rod that fits on the market.
rod dimentions from carrillo page:
01-05 gsxr750 15 or 16mm not sure?? anyone know this?? length 103.12mm
06+ gsxr750 15mm length 94.75mm
04-19 gsxr600 14mm length 92.28mm
01-03 gsxr600 15mm length 95.25mm
big end from 600's is 34.00mm
big end from 750's is 35.992mm

my questions are:
1. do anyone know the piston length from pin to deck is the same on a 600 and 750??
2. the 01-03 600 has a longer rod but is the cylinder block higher/longer to??
3. what are the differents between a 01-03 and 04-05 gsxr600 engine (without the head)??

what i want to say is: can i take a 01-03 gsxr600 engine, bore the cylinders put some gsxr750 pistons in it with a 15mm pin and put my 04-05 head back on it??

there is one more problem, it shouldn't be to expensive, i cant afford carrillo rods or somthing.
thanks for helping, i know it a difficult question.

with kind regards Ralf

 

[BillV]

Have you checked the Service Data section of the Servicing Information section of the relevant service manuals?

 

[RK-stuntz]

Have you checked the Service Data section of the Servicing Information section of the relevant service manuals?

yeah i have both manuals but they don't talk about sizes of parts only about play in the bearing etc..


i'm looking for someone that worked a lot on k1 to k5 engines and know the differents, and maybee have some parts to messure for me.

 

[BillV]

No guarantees but some of that info may be on the Wossner site or their distributors. Schnitz Racing's listings for Wossner and Carrillo have some. I've added a few things like rod length to my K5/K6 1000 service manual but I've forgotten where I got it. Details like deck height are going to be hard to find IMO.

 

[RK-stuntz]

wossner only sells pistons for a gsxr1000 and busa and some other suzuki bikes but not for the gsxr750 or 600.
i think i have to buy some second hands parts and just messure everything.
if anyone else have some info i like to hear about it.

 

[RK-stuntz]

i think i have the solution.
1. gsxr600 k1-k3 engine cases
2. gsxr600 k1-k3 rods (pin 15mm)
3. inside the engine everything from gsxr600 k4-k5 (crank, gears, clutch etc...)
4. gsxr1000 k5-k6 pistons (74.3mm - pin 15mm)
5. let bore the cylinders to 74.3mm
6. gsxr600 k4-k5 head, oilpan, oilcooler, engine covers etc..

that made it a 737cc with a short stroke.
and all made with second hands parts, only some bolts, seals, bearings and piston-rings.