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Makotosun

Piston critique

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Piston critique was created by yamahahaha

Got this as a parts bike... What can be said about what was going on with this piston?
09 Jul 2020 16:38 #1

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Replied by LongStride on topic Piston critique

Rings stuck? not seeing damage except for moisture, those rings look stuck
2ET703 Central Texas
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09 Jul 2020 17:06 #2

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Replied by yamahahaha on topic Piston critique

When I got the bike (Florida bike) hence the moisture...The piston was stuck due to moisture/rust....I did not think to see if rings are stuck...Will need to check
09 Jul 2020 17:14 #3

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Replied by apex on topic Piston critique


No need to check if they're stuck...they ARE stuck. Typical from sitting, going through seasonal/humid heat/cool cycling. Maybe you can free them up with some heat and a pick? Piston doesn't look too scored, that could cleaned up, crosshatch sand the cylinder...it will run.
Allrighty Then
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09 Jul 2020 22:20 #4

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Replied by yamahahaha on topic Piston critique

What is the best method for cross hatching the cylinder? I have one like the one shown. Also what oils can be used for lubrication?

www.napaonline.com/en/p/BK_7769221?cid=p...7QqgRt8aAsCUEALw_wcB
Last edit: 10 Jul 2020 05:11 by yamahahaha.
10 Jul 2020 05:10 #5

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Replied by yamahahaha on topic Piston critique

Will that suffice?
10 Jul 2020 13:30 #6

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Replied by yamahoper on topic Piston critique


I like using a ball hone 3 1/2" for 360 400 bore
You can use the 3 pad type , just be very careful at the bottom an around the ports that you don't have it catch
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10 Jul 2020 13:53 #7

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Replied by yamahahaha on topic Piston critique

Thanks and any special type of oil or can I use something like MMO or Kroil etc

What grit number do you recommend??
Last edit: 10 Jul 2020 14:57 by yamahahaha.
10 Jul 2020 14:48 #8

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Replied by yamahoper on topic Piston critique

Mine is a 240, most I've seen are ether 220 or 240 .
I use cheap 2 stroke oil for lubricating the cylinder during hone. Clean real good with brake clean ( the ports too). Blow off with compressed air. Rub down with 2st oil and paper towel. Clean gasket surfaces with alcohol, Assemble
10 Jul 2020 17:02 #9

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Replied by yamahahaha on topic Piston critique

Thanks for the help
10 Jul 2020 18:06 #10

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