.png "Powered by vBulletin")
Cruizin_Image_Co also now sell 65mm stock type cast pistons that bore +3.00mm overbore into GS650 cylinders, FYI...
They won't increase the compression ratio at all or the ability to run bigger aftermarket camshafts as they are basically a stock OEM style cast replacement, but it does increase the displacement quite a bit.
I should note that they are marketed for a 650, and with a head gasket, so the head gasket would not be thick enough to run as is on a 550 / 650 hybrid. You would need to have Cometic custom make you a .060" 65mm bore version of their GS650 gasket (around a 66 mm bore size on the gasket or whatever clearance they recommend).
Unless the gasket that comes with that piston set measures around 1.5mm or thicker.
In my opinion that is a lot better than trying to use a GS 650 custom thickness base gasket and stack the egg-shaped o-rings on top of the gasket, when they are originally meant to be metal to metal with .020 inch base gasket, not stacked up on top of a paper gasket and compressed .020"/0.5mm more than their design.
Or you can email gasketstogo.com and have them make you a one-off custom multi-layer steel head gasket based on the last then final version that we had made under my name for the GS550/GS650 hybrid engines. 1.6mm is a good thickness if your engine deck surface and cylinder head surfaces are in pristine condition with no scratching on the aluminum head in critical sealing areas around the bores or the outside 4 corner studs or the cam chain tunnel.
If you need the cylinder block resurfaced, 1.7 mm or 1.8 mm thickness would be good if it is just a minor skim coat taken off. If the head needs resurfaced, that does not put the piston any closer to the head, therefor thicker head or base gaskets are not needed. it does still alter the camshaft timing slightly and puts the valves slightly closer to the pistons, but it does increase the compression ratio when the head is resurfaced.
They won't increase the compression ratio at all or the ability to run bigger aftermarket camshafts as they are basically a stock OEM style cast replacement, but it does increase the displacement quite a bit.
I should note that they are marketed for a 650, and with a head gasket, so the head gasket would not be thick enough to run as is on a 550 / 650 hybrid. You would need to have Cometic custom make you a .060" 65mm bore version of their GS650 gasket (around a 66 mm bore size on the gasket or whatever clearance they recommend).
Unless the gasket that comes with that piston set measures around 1.5mm or thicker.
In my opinion that is a lot better than trying to use a GS 650 custom thickness base gasket and stack the egg-shaped o-rings on top of the gasket, when they are originally meant to be metal to metal with .020 inch base gasket, not stacked up on top of a paper gasket and compressed .020"/0.5mm more than their design.
Or you can email gasketstogo.com and have them make you a one-off custom multi-layer steel head gasket based on the last then final version that we had made under my name for the GS550/GS650 hybrid engines. 1.6mm is a good thickness if your engine deck surface and cylinder head surfaces are in pristine condition with no scratching on the aluminum head in critical sealing areas around the bores or the outside 4 corner studs or the cam chain tunnel.
If you need the cylinder block resurfaced, 1.7 mm or 1.8 mm thickness would be good if it is just a minor skim coat taken off. If the head needs resurfaced, that does not put the piston any closer to the head, therefor thicker head or base gaskets are not needed. it does still alter the camshaft timing slightly and puts the valves slightly closer to the pistons, but it does increase the compression ratio when the head is resurfaced.
Thank you!
Comment