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How do you install a new piston?

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Old 12-18-2009, 09:40 AM
justthisguy1292 justthisguy1292 is offline
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Default How do you install a new piston?

I recently blew a piston ring and it destroyed my piston and jug. i have replacements but i don't know how to put the new piston in. can someone explain how or tell me where a thread is that can explain it? I'm sure this has been explained several times.
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Old 12-18-2009, 09:46 AM
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Default Re: How do you install a new piston?

Pull the head and remove the jug. Remove the retaining clip from the upper rod pin in the piston. Remove the rod pin. Assemble in reverse order. OK I made that sound a littler easier than it is but that is pretty much it.
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Old 12-18-2009, 09:50 AM
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Default Re: How do you install a new piston?

Make sure you line up the anti rotation pin in the ring groove with the end gap of the ring.
Use some motor oil on the ring/piston when you replace it into the cylinder.
Use an extra set of hands to let the cylinder down onto the piston while you hold the ring in place unless you have a ring squeezer.
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Old 12-18-2009, 09:51 AM
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Default Re: How do you install a new piston?

and poke around in Norms lil corner here Norm's 2 stroke repair center - Bicycle Motor at Motorized Bicycle Forum
He has done almost everything ith these little motors and you could find pics of the whole process.
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Old 12-18-2009, 10:23 AM
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Default Re: How do you install a new piston?

lots of hardware/small motor shops have ring compressor sleves, I work alone alot and there worth the 8-10 $ one costs in extra hands.good luck
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Old 12-18-2009, 11:20 AM
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Default Re: How do you install a new piston?

You don't need a ring compresser for these.
Also, make sure the piston is facing the right way! & take heed of what Joe said above about the little pins in the ring grooves!!!!! (you WILL break the rings if you don't!)
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Old 12-20-2009, 04:26 PM
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Default Re: How do you install a new piston?

I have the rings on the new piston. I took out what i think is a retaining pin or clip of some kind from the old piston but the rod inside won't come out. it slides around but does not completely come out. should i force it?
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