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Help GSX Replacement pistons?

Discussion in 'Suzuki 250cc Twins' started by Johnny, Nov 23, 2014.

  1. Johnny

    Johnny Well-Known Member Premium Member

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    Johnny, Nov 23, 2014
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  2. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Nov 23, 2014
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  3. PFAQ

    PFAQ Active Member

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    Was this a direct replacement?
     
    PFAQ, Jan 27, 2016
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  4. Johnny

    Johnny Well-Known Member Premium Member

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    Unfortunately, I never got to the pistons, there came some other trouble with the bike which had to be sorted out first (€€€). But I still have the bike and I may try to get the pistons sometime in the future!
     
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    Johnny, Feb 25, 2016
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  5. Brendengra

    Brendengra Active Member

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    Hey mate.

    I recently rebuilt my top end replacing the Pistons. I went with original Suzuki parts. It did cost a fortune though. I think something like $180 per position.

    If you email Ray from http://www.suziparts.com.au/
    He can basically source you anything.

    Hope that helps.
     
    Brendengra, Oct 17, 2016
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  6. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    some related posts concerning Chinese pistons
    MC22 pistons
    http://www.400greybike.com/forum/viewtopic.php?p=371607&sid=91d093d80d47dc772662ecf29705701c#p371607

    which is co-incidentally this bike - synopsis, pistons good, rings not so good

    http://2fiftycc.com/index.php?threads/dave-moss-cbr250rr-mc22-racing-in-california.8371/

    Given that the above are different pistons for a different make and model of bike, it's unsafe to assume that the GSX pistons would be of identical quality, BUT, it seems to definitely be worth investigating, perhaps purchasing one single piston from aliexpress and making comparisons and measurements
     
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    ruckusman, Oct 17, 2016
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  7. Johnny

    Johnny Well-Known Member Premium Member

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    Well, the best bet seems now really to go with the original parts...
    Brendengra, did you get the oversize pistons or standard?
     
    Johnny, Nov 16, 2016
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  8. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, Nov 16, 2016
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  9. Brendengra

    Brendengra Active Member

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    My barrel was in great condition so I stuck with the standard size. Just a slight hone then it was good to go.
     
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    Brendengra, Nov 16, 2016
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  10. Johnny

    Johnny Well-Known Member Premium Member

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    Yes, I've got the numbers now! I bought the parts catalogue (uploaded a .pdf to the Resources section too) and an original service manual (not scanned yet...). The parts catalogue lists three different piston types, respectively for „model T“, „model X“ and „model X: E4“. My bike should be X, by frame number. According to the service manual (and not the parts catalogue BTW, it doesn't explain it!) the E04 is a bike made for France. Now, I don't know for sure, but if I take a shot that my bike wasn't made for France, then it is just a „model X“. Anyways, here are the numbers for all three piston types (and note that there are only two types for 1mm oversize):

    12111-11401 (STD) model T
    12111-11402 (STD) model X
    12111-11410 (STD) model X: E4

    12111-11401-050 (OS:0.5) model T
    12111-11402-050 (OS:0.5) model X
    12111-11410-050 (OS:0.5) model X: E4

    12111-11401-100 (OS: 1.0) model T
    12111-11402-100 (OS: 1.0) model X
     
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    Johnny, Nov 17, 2016
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  11. Johnny

    Johnny Well-Known Member Premium Member

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    And now I have the pistons. OEM. Went for the 1mm oversize so I'd be sure that they fit. I don't have the gaskets yet but I'll get 'em too. Or actually I do have gaskets, I have an aftermarket set, but I'll keep those for backup.
     
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    Johnny, Apr 1, 2017
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  12. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    1mm oversize means you have to have the cylinders bored out to match and then honed.
     
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    Linkin, Apr 1, 2017
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  13. Johnny

    Johnny Well-Known Member Premium Member

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    Yes, I know. The bike has around 67 000 km on the clock, the left muffler smokes heavily and there is some suspicious sound in the engine that may or may not be caused by worn out pistons, thus I ordered the biggest pistons available so to assure that I can still use my old cylinders by having them bored to size.
     
    Johnny, Apr 2, 2017
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  14. circa250

    circa250 Member

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    hey mate where did you get your pistons from?
     
    circa250, May 17, 2017
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  15. Brendengra

    Brendengra Active Member

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    Check out www.suziparts.com.au he sourced me genuine Suzuki pistons. Expensive but worth it.
     
    Brendengra, May 17, 2017
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  16. circa250

    circa250 Member

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    cheers for the fast reply bud.
     
    circa250, May 17, 2017
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  17. Johnny

    Johnny Well-Known Member Premium Member

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    I ordered mine from www.partzilla.com. The pistons came with piston rings included by the way, I wasn't even expecting that.
     
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    Johnny, May 18, 2017
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  18. circa250

    circa250 Member

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    Were they original or after market? if after market have you noticed any issues with power etc?
     
    circa250, May 18, 2017
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  19. Johnny

    Johnny Well-Known Member Premium Member

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    They are original, Partzilla sells only OEM stuff. I haven't replaced them yet, as I am missing still the cylinder head gasket and a couple of bolts I'd like to change as well.
     
    Johnny, May 18, 2017
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  20. circa250

    circa250 Member

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    ok sweet, thanks for your help
     
    circa250, May 18, 2017
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