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Stihl BR420 piston in Stihl 034 saw

John Lyngdal

John Lyngdal

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Both have the same bore and stroke and just looking for a replacement piston for the saw I have torn apart. The pistons look similar and I could machine the piston if needed.
 
NIP Group
Mad Professor

Mad Professor

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Same bore and stroke does not mean the piston is the same. Pin size and compression height may differ. Design may differ as well.

Use a stock piston. If NLA, you may need to move to a 48mm top end.
OEM and Meteor both list 46mm 034 pistons. Stihl piston is pricey, ~$80.

I don't have a BR420 IPL to check part # for piston. If it is same as 034 it will be 1125 030 2002. I doubt it is, cylinders are much different.
 
cuinrearview

cuinrearview

Red saw lover
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Seems like the 46mm stuff is usually pretty cheap because most go 48mm when replacing parts. I understand though if you have the part sitting in front of you. Let us know if you end up giving it a go, and take lots of pictures.
 
John Lyngdal

John Lyngdal

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The swap was inspired by the modified 028 piston I have on my 024.
Spotted an inexpensive 46mm BR420 Chinesium piston for sale and so I posed the question.
The OEM piston has some minor scoring, but really only needs to be cleaned up and have a new set of rings installed to be put back in service.
 
Mad Professor

Mad Professor

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Buy a Meteor for ~$35 USA and be done with it. Or pony up for a OEM.

How much time would you have into it make it fit? Would it be worth ~$15? Or ~$65 OEM?

Then if it blew up in ~5 minutes..........and trashed the clyinder........

P.S. I still have two Stihl NOS/OEM 46mm 034 cylinders, no pistons, on trading post......
 
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