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Thread: Source for caliper pistons??

  1. #1
    Join Date
    Oct 2002
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    Source for caliper pistons??

    I have some calipers to rebuild, and many pistons are identical.

    I found Moose at a price of 13$ a piston, but they don't list one (at least I didn't find it yet on Ebay) for the 350X dual piston front caliper.

    I have about 2 dozen calipers to rebuild.

    I'm considering making my own, I can order the phenolic material that Honda used sometimes.

    Anyone have a source by size? Or just a suggestion on where else to search??

    Thanks for any help!!
    All our government does is distract us while they steal from us, misspend our tax $ and ruin our country

  2. #2
    Join Date
    Jun 2003
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    I read somewhere that the piston used in 85/86 atc250r, 86-89 trx250r and 85/86 350x(front only) is the same as pistons for early 2000 cr250r front caliper pistons. Well, except for the parking brake piston.

  3. #3
    Join Date
    Oct 2002
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    I've been digging everywhere, crossing part numbers and so on without a ton of luck.

    None can be found by size, only steel or phenolic is mentioned; Which, BTW, I can buy a foot and machine up my own pistons.

    Other thing is Moose, Moose seems to carry tons of caliper pistons for about 11$ each which is great. I just can't find one for the 350X, ATC or TRX.

    I did read some year CRF230L may use the same size piston...
    All our government does is distract us while they steal from us, misspend our tax $ and ruin our country

  4. #4
    Join Date
    Feb 2013
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    Im in the same situation. Looking for 2 sets. Looking up by part number I found the follow machines that use the same piston.

    This Honda 45107-MG3-016 PISTON fits the following models and components:

    Honda ATV 1985 ATC350X A Front Brake Caliper (1)

    Honda ATV 1986 ATC350X A Front Brake Caliper 2

    Honda ATV 1986 TRX250R A - FOURTRAX 250R Front Brake-Caliper

    Honda Motorcycle 1984 XL600R A Front Brake-Caliper

    Honda Motorcycle 1983 XL600R A Front Brake-Caliper

    Honda ATV 1985 ATC250R A Front Brake-Caliper

    Honda ATV 1986 ATC250R A Front Brake-Caliper

    Honda ATV 1987 TRX250R A - FOURTRAX 250R Front Brake-Caliper

  5. #5
    Join Date
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    Thanks Troy, I did find that as well but I can't find the XR pistons either.

    Maybe one of those websites for XR's only...
    All our government does is distract us while they steal from us, misspend our tax $ and ruin our country

  6. #6
    Join Date
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    Quote Originally Posted by Troyg25 View Post
    Im in the same situation. Looking for 2 sets. Looking up by part number I found the follow machines that use the same piston.

    This Honda 45107-MG3-016 PISTON fits the following models and components:

    Honda ATV 1985 ATC350X A Front Brake Caliper (1)

    Honda ATV 1986 ATC350X A Front Brake Caliper 2

    Honda ATV 1986 TRX250R A - FOURTRAX 250R Front Brake-Caliper

    Honda Motorcycle 1984 XL600R A Front Brake-Caliper

    Honda Motorcycle 1983 XL600R A Front Brake-Caliper

    Honda ATV 1985 ATC250R A Front Brake-Caliper

    Honda ATV 1986 ATC250R A Front Brake-Caliper

    Honda ATV 1987 TRX250R A - FOURTRAX 250R Front Brake-Caliper

    brake pistons for most cr250 and cr125 will work for them, they are slightly different, as they are lighter and made of the different material.

  7. #7
    Join Date
    Feb 2013
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    Quote Originally Posted by deathman53 View Post
    brake pistons for most cr250 and cr125 will work for them, they are slightly different, as they are lighter and made of the different material.
    Can you please tell me what years and are the sizes the same for front and back pistons for the cr125/250? Are the internal seals also the same?

    Thank you

  8. #8
    Join Date
    Dec 2019
    Location
    Long Island
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    85
    I just got 2 OEM pistons from rocky Mountain last week but now it looks like they are unavailable. I boogered up the caliper bore trying to get the old ones out as the top metal portion fell off and the rest of it, I guess that phenolic material, was seized in there good. Rocky Mountain said they could get me the caliper body but it was backordered. I'm hoping but not holding my breath. Any chance one of those caliper bodies is for sale if Rocky Mountain doesn't come through? I have the bracket and rebuild kit, I just need the body with the bores.
    In the garage
    2007 Yamaha Tri-Z 450
    2017 YZ 250F
    2003 XR100 (son's)
    2005 Raptor 350 (other son's)


    Gone but not forgotten
    86 350X
    16 WR 250R
    03 FZ1
    96 Katana 600
    89 XT350
    84 250R
    84 200X
    79 ATC 110
    74 ATC 90

  9. #9
    gaby is offline New to the board Arm chair racerNew to the board
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    Quote Originally Posted by deathman53 View Post
    I read somewhere that the piston used in 85/86 atc250r, 86-89 trx250r and 85/86 350x(front only) is the same as pistons for early 2000 cr250r front caliper pistons. Well, except for the parking brake piston.
    If the pistons on the front and rear calipers on a 1985 atc250r are the same size I think I found something. I know the rear caliper pistons are 25.3mm

  10. #10
    gaby is offline New to the board Arm chair racerNew to the board
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    Boomerangsports.com made by nissin

  11. #11
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    Oct 2002
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    Quote Originally Posted by TSpencer View Post
    I just got 2 OEM pistons from rocky Mountain last week but now it looks like they are unavailable. I boogered up the caliper bore trying to get the old ones out as the top metal portion fell off and the rest of it, I guess that phenolic material, was seized in there good. Rocky Mountain said they could get me the caliper body but it was backordered. I'm hoping but not holding my breath. Any chance one of those caliper bodies is for sale if Rocky Mountain doesn't come through? I have the bracket and rebuild kit, I just need the body with the bores.
    Next time put a solid bolt in the brake line hole. Loosen your bleeder and the end of grease gun, it will op on and you can push them out safely, just messy.

    They will not always come out even if it's a dual piston, you have to get creative to stop one side while pushing the other until you can wiggle them out, it's easy...
    All our government does is distract us while they steal from us, misspend our tax $ and ruin our country

  12. #12
    Join Date
    Aug 2006
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    new hampshire
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    I’m a parts unlimited dealer do you need me to price any parts? I need to rebuild the brakes on my 350x. I have no problem ordering a couple to measure if you think something might work.
    1982 ATC 70
    1983 ATC 200E yard rat
    1984 ATC 200X
    1984 ATC 200S (X2)
    1985 ATC 70 (X2)
    1985 ATC 200S
    1985 ATC 250R
    1986 TRX 70
    1986 ATC 350X
    2004 kfx 700 XC
    2006 prarie 700 XC
    2009 Brute Force 750
    2020 CF Moto 600

  13. #13
    Join Date
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    Quote Originally Posted by badasskfx View Post
    I’m a parts unlimited dealer do you need me to price any parts? I need to rebuild the brakes on my 350x. I have no problem ordering a couple to measure if you think something might work.
    I'm definitely interested in the cost of pistons. I think many of them are just a standard size and will work fine.

    There's a dude on Ebay selling pistons and valve buckets for thumpers, he's making bank!! He must have some great resources, sometimes we just stumble upon things...

    Does PU go by size in mm's? or by model?? Thanks Shaun/Sean/Shawn - I forget now
    All our government does is distract us while they steal from us, misspend our tax $ and ruin our country

  14. #14
    Join Date
    Jul 2021
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    SE Michigan
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    7
    Any updates on sourced parts??

    In measuring an 85 front and an 85&86 rear.. The front 250r pistons are .001" less than the rears in diameter. The difference must be due to the expansion if the steel being greater. Aside from the parking post the rear pistons are almost .035" shorter in height.

    Why not just use the front phelonics in the rear, shave them down .035" and enjoy the weight savings..

  15. #15
    Join Date
    Jul 2005
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    Manheim, PA
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    I used trx450r ones in my 350x caliper, no issues and delrin.

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