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Thread: Piston pin puller

  1. #1
    Loading the Bike
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    Question Piston pin puller

    Anyone have an airhead piston pin puller recommendation? There are many out there...
    The one I have is too small for the 900 cc pin. (Suzuki GS750 factory tool)
    Thanks, TJ

  2. #2
    Registered User skiteach's Avatar
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    They are not that tight. I have only used gentle taps - rubber mallet even - and a drift that fit.
    '73 R75/5
    Never had a bad day skiing!

  3. #3
    Liaison 20774's Avatar
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    On my R69S, I used a hair dryer on high setting to warm up the piston so the pin could be easily driven out with a wooden dowel.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  4. #4
    I use a long bolt with little deep well sockets on one end and a big deep well socket on the other. When I tighten a nut on the end of the bolt, the little sockets push the pin into the big socket.

  5. #5
    BeemerBoy terham's Avatar
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    I bought a wooden dowel at the local arts and crafts store in the correct size, cut it to a shorter length and tapped the wrist pins out. I don't remember the size of dowel, but they're pretty cheap and I bought several sizes so only one trip would be necessary. Worked pretty well for me.
    Terence
    Current rides R75/5 R100RS R1150RT
    Past rides K100RS R1100S
    My Smugmug

  6. #6
    John D'oh
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    Piston Pin Puller - Home made...

    Here is a photo of a piston pin puller I made to work with R100/7 piston and pins. The piston pin in the photo is out of a 77R100. It works for R90 too because the radius on the PVC is about the same. I have another PVC pipe fitted to R75 and R80 pistons too. The threaded carriage bolt is 7 inches long 3/8 inch diameter. The PVC is 1 ??” dia. x 3 ?? approximately. The head on the carriage bolt is just a little bit smaller than the OD of the piston pin so it clears the piston - pin bore easily. Note: The second large thinner washer helps keep all the parts together when it’s not in use.

    You do not have to heat the piston nor do you have to beat on the piston [and connecting rod and big end bearings along with it]. Tighten the nut on the carriage bolt and it will draw the pin out into the PVC tube. Don’t forget to hold on to the connecting rod so it doesn’t drop against the block…Relocate the pin back in the piston and connecting rod by hand at re-assembly, re-insert the puller backwards and use it to draw the pin back into the bore.

    Guys…Don’t beat on the pistons OK? This puller cost three dollars and ten minutes with a grinder to get the radus on the PVC right.
    Last edited by Na Cl K9; 08-08-2012 at 04:07 PM.

  7. #7
    Quote Originally Posted by s09rwmb View Post
    Here is a photo of a piston pin puller I made
    Quite similar to mine.


  8. #8
    Registered User skiteach's Avatar
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    The only pistons I beat on were then cut out by any means we could. Seem to remember drilling and cold chisels being involved- we saved the block!
    '73 R75/5
    Never had a bad day skiing!

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