Franchizai Posted May 25, 2019 Posted May 25, 2019 Hey everyone. ive currently dissasembled my gs750 1977 engine to find out the the previous owner installed a bored gs750 cylinder. the bore size is 69mm. and the pistons doesnt seem like suzukis. at first i thought i was gs850 piston installed but looke like another brand. i my self is guessing its wiseco pistons as they have the same number on the bottom as their product number and what looks like a circle with a W in it. im thinking i wanna replace the piston rings since i have everything apart anyways so i really want to make sure i get the right ones. anyone have any input on these pistons and can help me ? Quote
B12Mick Posted May 25, 2019 Posted May 25, 2019 Yep, Wiseco pistons http://www.toutpourlamoto.fr/cylindres-kits-cylindre-piston/kit-844cc-suz-gs750-77-79-4035ps-xc2717-s259-cw16-2mm-w2487-10251_p_122341.html Dont forget to gap the new rings before fitting Quote
wraith Posted May 25, 2019 Posted May 25, 2019 +1 on the above. Welcome to OSS a good start having a bored out motor on here Quote
Franchizai Posted May 25, 2019 Author Posted May 25, 2019 Great to know and yes it was a pleasent surprise to find out that i already had a bored out cylinder with with very nice pistons that seems very new actually. the cylinders bores themselves are also in perfect condition. Quote
Jaydee Posted May 26, 2019 Posted May 26, 2019 8 hours ago, Franchizai said: im thinking i wanna replace the piston rings since i have everything apart anyways so i really want to make sure i get the right ones. The XC stamped on the top of the piston is the ring configuration. XC is 1mm top, 1.2mm middle and 2.8 oil rings. Quote
Askamaskinservice Posted May 26, 2019 Posted May 26, 2019 Welcome to OSS. Nice Suzuki, you got pictures? //Hasse. Quote
Franchizai Posted May 26, 2019 Author Posted May 26, 2019 4 hours ago, Jaydee said: The XC stamped on the top of the piston is the ring configuration. XC is 1mm top, 1.2mm middle and 2.8 oil Cool i ordered the 2717xc piston ring kit from wiseco. Couldn't find information about the ring dimensions others than the bore dimension. Most recent pictures as you can imagine it's pretty disassembled atm. 2 Quote
Swiss Toni Posted May 28, 2019 Posted May 28, 2019 If those wheels are OE, you may find the bike is '78 EC. And welcome to OSS. Quote
Franchizai Posted June 8, 2019 Author Posted June 8, 2019 (edited) On 5/28/2019 at 3:41 PM, Swiss Toni said: If those wheels are OE, you may find the bike is '78 EC. And welcome to OSS. Im pretty sure i found out it the frame was from 1977 originally the frame number is gs750d-16287 i think i read somewhere that in certain countrys the cast wheels came earlier than other. that coud be the case otherwise previous owner changed them i guess. and i found this list on a danish suzuki page Suzuki GS 750 B 1977 GS750 GS750-10001 GS750-32603 Suzuki GS 750 C 1978 GS750 GS750-32604 GS750-45133 Suzuki GS 750 N 1979 GS750 GS750-45134 Suzuki GS 750 D B 1977 GS750D GS750D-10001 GS750D-20096 Suzuki GS 750 D C 1978 GS750D GS750D-20097 GS750D-22016 Suzuki GS 750 D N 1979 GS750D GS750D-22017 Suzuki GS 750 E C 1978 GS750E GS750E-10001 GS750E-34214 Suzuki GS 750 E N 1979 GS750E GS750E-34215 GS750E-700000 Edited June 8, 2019 by Franchizai Quote
Franchizai Posted June 8, 2019 Author Posted June 8, 2019 I was wondering about base gasket for the cylinder. since its been bored to 69mm is it still fine to use the stadard base gasket or should i get one from the gs850 instead to fit the bore? or can i just trim the edges ? Quote
Swiss Toni Posted June 8, 2019 Posted June 8, 2019 If you've just got a std base gasket, I'd try trimming it. Quote
gs7_11 Posted June 8, 2019 Posted June 8, 2019 The base gasket goes round the outside of the sleeves. The bore doesn't affect it. Quote
Franchizai Posted June 8, 2019 Author Posted June 8, 2019 (edited) 30 minutes ago, gs7_11 said: The base gasket goes round the outside of the sleeves. The bore doesn't affect it. Ahh yes of course it does. I forgot I only have a athena gasket though so I better get oem I think, or will it be fine there? Edited June 8, 2019 by Franchizai Wrong gasket name Quote
Swiss Toni Posted June 9, 2019 Posted June 9, 2019 16 hours ago, gs7_11 said: The base gasket goes round the outside of the sleeves. The bore doesn't affect it. Doh! Cart before horse! I'm thinking 'bigger bore...bigger liners', not overbore! My mistook! Quote
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