Is this piston bad?

cr25003boy
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18
Joined
7/29/2024
Location
Cassville, MO US

intake side then exhaust side. My bike smokes a lot I run 32 to 1 usually it’s also very boggy one day it kinda seized I was riding it and it just bogged a bunch and puttered out bottom end is fine so I was wondering if the piston needs replacing? It’s ran pretty great before that one day and since then it smokes a lot tooIMG 1583

 

IMG 1582 0
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40acres
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807
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7/23/2017
Location
Houston, TX US
7/30/2024 10:19am

You only need one post bud, but yes, there's some visible blow by on that piston. The bottom of the skirt is also showing some signs of wear. Measure your cylinder to make sure it's still in round and in spec, then order the appropriate size piston. Be sure to measure ring end gap as well. What jetting are you currently running and what elevation are you at? What does your spark plug look like?  

cr25003boy
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18
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7/29/2024
Location
Cassville, MO US
7/30/2024 11:11am

Don’t know about jetting. Spark plugs a little oily. I think elevation is 1300 feet. How do you measure the cylinder on a budget? Also what’s the ring gap supposed to be?

8/1/2024 5:44am

When in doubt, replace everything. You'll be in a worse spot if you cheap out. I learned this many years ago. 😂

2

The Shop

526
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5/4/2009
Location
Colgate, WI US
8/1/2024 12:12pm

A 2 stroke piston being cracked is more of a problem that some wear on the sides, that's why you replace if the skirt breaks off it does damage the wear isn't going to cause and explosion only make it run poor.  

cr25003boy
Posts
18
Joined
7/29/2024
Location
Cassville, MO US
8/3/2024 7:32am

When in doubt, replace everything. You'll be in a worse spot if you cheap out. I learned this many years ago. 😂

Yeah that’s what I’m doing I got a wiseco kit

Banana_oil
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527
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10/20/2011
Location
Gothenburg SE
8/4/2024 9:10am

Bad crank seal on clutch side would give poor idle and smoke.

cr25003boy
Posts
18
Joined
7/29/2024
Location
Cassville, MO US
8/4/2024 10:35am
Banana_oil wrote:

Bad crank seal on clutch side would give poor idle and smoke.

Would it make it bog a little more than normal too?

Banana_oil
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527
Joined
10/20/2011
Location
Gothenburg SE
8/4/2024 10:24pm

Yes and unstable idle

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