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Thread: Potential Group Purchase - Wiseco GS650 741cc pistons

  1. #1
    Join Date
    Aug 2015
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    Default Potential Group Purchase - Wiseco GS650 741cc pistons

    Hey everybody,

    I just called Wiseco today. They would be more than happy to start making some GS650 big bore pistons which are have a 65mm bore. Thanks to Chuck in another thread, we have the part number for these pistons. The gentleman from wiseco told me that there is a minimum order of 12 pistons, and each piston would roughly cost $125 dollars. That price will include the rings, wrist pin and clips. Of course that price will change with size of order we place with them. If you are interested in a set please post on this thread. I have never done a group buy before, so I am not sure how to get money exchanged, so I am asking for some expert advice.

    Thanks,

    Andy

  2. #2
    Join Date
    Oct 2006
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    So Cal
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    3 sets, for 500 a set is pretty fair!
    Ray.
    85GS1150E 83GS1100ESD 83GS1100SD 83GS1100ED 82GS1000SZ 96GSXR1500Dragbike 96GSXR1400Dragbike 90GSXR1166Dragbike 04SDG110PITBIKE + 8 Quads! "Life is tough! It's even tougher if you're stupid!" John Wayne

  3. #3
    Join Date
    Aug 2012
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    Awesome, I'm really glad Adam aka Loud ET got that 1981 catalog and scanned the GS big bore kit page, and also very stoked that Ace took the initiative to call Wiseco!

    Adam's vintage performance catalog score that was the fuel for this thread, got us the original 1981 Wiseco part number to request a new batch from:


    In conjunction with this, someone may need to buy a fresh uncompressed gs650 stock head gasket and send it to Cometic and have them make a 65mm bore version of it. Unless of course they already have a CAD drawing/gasket scan & specs on file.

    Potentially a Multi Layer Steel gasket with a delete on the cam chain tunnel o-ring and oil pressure seals on the outer studs would be the better bet, but that is up for debate. MLS is usually the best, but are typically the most sensitive to head warpage and surface imperfections. A fresh milling to clean up any imperfections or warpage may be in order, or at least a very good scrubbing with a rag,rubber gloves, & laquer thinner and then a masking tape job on the cylinder bores and outer cylinder block surfaces, as well as same on head & combustion chambers, then 1 or 2 light fogging coats on all gasket surfaces & gasket of copper coat or Ray's recommendation (blue stuff, wasn't it? Hylomar?) in a clean dust free environment and then immediate install after it has tacked up.

    I think the MLS is the best way to go personally. Suzuki replaced the composite GS850 & GS1000 gasket part numbers as obsolete and superceded with the larger bore GS1100G Multi Layer Steel gasket's part number, which I'm running with zero problems in my 72mm GS750-920cc with decking/milling both block and head, & permatex copper coat. The 1100G does not use a cam chain tunnel rectangular o-ring seal or oil passage seals on the outer studs, where the original gs850&gs1000 gaskets did. I was instructed by members here to not fit the tunnel o-ring in, & have had zero problems. I think the gasket may overlap into the area where the o-ring goes, so the gasket would have to be specifically designed for using in place of the oil pressure seals and cam chain tunnel o-rings.
    Last edited by Chuck78; 02-01-2016 at 06:12 PM.

    '77 GS750
    920cc, 4-1, GS1100E swinger, 18"rims, Fox Factory Shox, twinpot dual disc, VM29's, Yoshi cams
    '99 Kawasaki KDX220 rugged terrain ripper
    '74 Rickman VR250MX
    PROJECTS:
    '77 Suzuki PE250 Pure Enduro trail beast, ported, Wiseco, TüBliss, Fox Factory Shox/RaceTech
    '76 Rickman CR GS1000-1120cc roadracer, Yoshi cams&4-1, RF900R fork, Works ProRacers
    '79 GS425 489cc, GR650 cams, GS650 fork, twinpot discs, DID rims, GS1100E swinger, Fox Factory Shox
    '77 GS550 650-740cc susp/brake mods

  4. #4
    Join Date
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    Near South Park
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    I'm in. One set for sure, but if it takes another set or two to get the the next price point I'll do that.

    Too bad, I had a Suzuki 650 gasket, but I just put it in the engine and torqued it down. A still have an aftermarket one, but it's probably not good enough.


    Life is too short to ride an L.

  5. #5
    Join Date
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    I'm in on one set, but unless someone wants to buy a nice freshly honed good useable bore 650 cylinder, new OEM piston rings, & great shape OEM pistons, it's gonna take me a few paychecks to get there. House rehab funds, doctor bills from a broken wrist, and a few purchases for my GS-powered Rickman CR900 build have already eaten up my funds... time to cash out some other collectible assets next week so it seems.

    Forum newbie drey6 (veteran poster on dotheton.com, new GS project owner) will be interested as well if enough time elapses before the order date.

    Boonton Mike will probably chime in here as well.

    Ace and Tom, how soon were you guys trying to get some sets in hand? Seems like you're both fired up and wrenching to get them running ASAP.

    Waiting a bit will allow others time to see what deal we are arranging, and allow more a chance to get in on the first order to get a better price for all of us.
    Last edited by Chuck78; 02-01-2016 at 05:58 PM.

    '77 GS750
    920cc, 4-1, GS1100E swinger, 18"rims, Fox Factory Shox, twinpot dual disc, VM29's, Yoshi cams
    '99 Kawasaki KDX220 rugged terrain ripper
    '74 Rickman VR250MX
    PROJECTS:
    '77 Suzuki PE250 Pure Enduro trail beast, ported, Wiseco, TüBliss, Fox Factory Shox/RaceTech
    '76 Rickman CR GS1000-1120cc roadracer, Yoshi cams&4-1, RF900R fork, Works ProRacers
    '79 GS425 489cc, GR650 cams, GS650 fork, twinpot discs, DID rims, GS1100E swinger, Fox Factory Shox
    '77 GS550 650-740cc susp/brake mods

  6. #6
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    Aug 2012
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    Columbus, Ohio
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    Ace, did they say they are good to go solely with the K740 part #, as in they definitely already have all the drawings & specs needed?

    If so, this is AWESOME.

    I wonder if they can make some adjustments to current drsigns, as in if I wanted a 71mm version of the 69mm gs750-844cc piston. Who was the person you spoke to? I may need to call them and see about that, as by May-June, I'll be needing 6 of those 894cc pistons for my gs425 & Rickman GS750...

    '77 GS750
    920cc, 4-1, GS1100E swinger, 18"rims, Fox Factory Shox, twinpot dual disc, VM29's, Yoshi cams
    '99 Kawasaki KDX220 rugged terrain ripper
    '74 Rickman VR250MX
    PROJECTS:
    '77 Suzuki PE250 Pure Enduro trail beast, ported, Wiseco, TüBliss, Fox Factory Shox/RaceTech
    '76 Rickman CR GS1000-1120cc roadracer, Yoshi cams&4-1, RF900R fork, Works ProRacers
    '79 GS425 489cc, GR650 cams, GS650 fork, twinpot discs, DID rims, GS1100E swinger, Fox Factory Shox
    '77 GS550 650-740cc susp/brake mods

  7. #7
    Join Date
    Aug 2012
    Location
    Columbus, Ohio
    Posts
    3,601

    Default


    '77 GS750
    920cc, 4-1, GS1100E swinger, 18"rims, Fox Factory Shox, twinpot dual disc, VM29's, Yoshi cams
    '99 Kawasaki KDX220 rugged terrain ripper
    '74 Rickman VR250MX
    PROJECTS:
    '77 Suzuki PE250 Pure Enduro trail beast, ported, Wiseco, TüBliss, Fox Factory Shox/RaceTech
    '76 Rickman CR GS1000-1120cc roadracer, Yoshi cams&4-1, RF900R fork, Works ProRacers
    '79 GS425 489cc, GR650 cams, GS650 fork, twinpot discs, DID rims, GS1100E swinger, Fox Factory Shox
    '77 GS550 650-740cc susp/brake mods

  8. #8
    Join Date
    Jan 2006
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    Near South Park
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    35,571

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    Quote Originally Posted by Chuck78 View Post
    I'm in on one set, but unless someone wants to buy a nice freshly honed good useable bore 650 cylinder, new OEM piston rings, & great shape OEM pistons, it's gonna take me a few paychecks to get there.
    PM on the way...


    Quote Originally Posted by Chuck78 View Post
    Ace and Tom, how soon were you guys trying to get some sets in hand? Seems like you're both fired up and wrenching to get them running ASAP.

    Not in a hurry at all, but if this deal happens I do NOT want to miss out on it.


    Life is too short to ride an L.

  9. #9
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    Apr 2004
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    Wilmington Delaware
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    It's nice to see the 650 getting some respect. I've got a complete 660G engine, another cylinder set, and a 650 head I'd like to sell. PM me if interested
    1981 GS650G , all the bike you need
    1980 GS1000G Power corrupts, and absolute power corrupts absolutely

  10. #10
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    Aug 2015
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    Fargo, North Dakota
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    Hey Chuck,

    I only had about ten minutes to talk to the guy today. He was very helpful though. Whenever I told him "I was wanting a big bore set for a Suzuki GS650" he laughed and said "yes we used to make them about a 100 years ago". He then told me I wouldn't be any problem to make any more of them, and he gave me the extension of a gentleman named AL. I will call him tomorrow and see if he can give me more details. I would like to get the order in half-way soon, but I also want to wait so more people can jump on this opportunity and I am a little short on cash as well. If we do go ahead with this group buy, how does the money exchange work? I know I don't have the money to front the cost of that many pistons. Ha ha ha

    Since you sent me the link on a custom head gasket, I am guessing there is not a gasket already being made for this application. Am I correct? ha ha

    Like I said in my first post guys, I have never done anything like this before, so if there are some other things we need to look into, please post them.

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