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Piston critique

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

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09 Jul 2020 17:06
LongStride
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Piston critique #2
Rings stuck? not seeing damage except for moisture, those rings look stuck
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09 Jul 2020 17:14
yamahahaha
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Piston critique #3
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

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09 Jul 2020 22:20
apex
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Piston critique #4

yamahahaha wrote: 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


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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10 Jul 2020 05:10 10 Jul 2020 05:11 by yamahahaha.
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Piston critique #5
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

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

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10 Jul 2020 13:53
yamahoper
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Piston critique #7

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 14:48 10 Jul 2020 14:57 by yamahahaha.
yamahahaha
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Piston critique #8
Thanks and any special type of oil or can I use something like MMO or Kroil etc

What grit number do you recommend??

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10 Jul 2020 17:02
yamahoper
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Piston critique #9
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

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10 Jul 2020 18:06
yamahahaha
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Piston critique #10
Thanks for the help

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