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0120raptor
 Post subject: Wossner pistons
PostPosted: Fri Jan 19, 2024 4:50 pm 

Joined: Fri Oct 13, 2023 5:52 am
Posts: 36
Location: Manchester UK
Just about to fit my new Wossner pistons but have 2 questions
1) They don`t have a lubrication hole for the gudgeon pin. The old genuine Kawasaki ones do.
2) What`s the squarish recess above the pin hole for ? Won`t that interfere with the transfer ports ?
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ALTERED IMAGE
 Post subject: Re: Wossner pistons
PostPosted: Sat Jan 20, 2024 9:35 am 
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Joined: Sun Sep 06, 2015 6:01 am
Posts: 300
Location: Metamora, MI
Woss has "mickey mouse ears"
recess is for lightening

cliff
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Jim
 Post subject: Re: Wossner pistons
PostPosted: Sat Jan 20, 2024 11:43 am 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9840
Location: North Central NC
The wrist pin lubrication holes must not be needed. The bearing is a roller type anyway. I certainly have not had any trouble with my Wössner pistons.

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If it surges, that's normal, upshift.
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0120raptor
 Post subject: Re: Wossner pistons
PostPosted: Sat Jan 20, 2024 11:58 am 

Joined: Fri Oct 13, 2023 5:52 am
Posts: 36
Location: Manchester UK
Jim wrote:
The wrist pin lubrication holes must not be needed. The bearing is a roller type anyway. I certainly have not had any trouble with my Wössner pistons.

I`ve only just noticed but the pistons do have a small oil groove for lube in the pin bore.
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Jim
 Post subject: Re: Wossner pistons
PostPosted: Sat Jan 20, 2024 2:32 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9840
Location: North Central NC
0120raptor wrote:
I`ve only just noticed but the pistons do have a small oil groove for lube in the pin bore.


I don't remember that. Where is the groove?

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If it surges, that's normal, upshift.
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0120raptor
 Post subject: Re: Wossner pistons
PostPosted: Sat Jan 20, 2024 3:06 pm 

Joined: Fri Oct 13, 2023 5:52 am
Posts: 36
Location: Manchester UK
Jim wrote:
0120raptor wrote:
I`ve only just noticed but the pistons do have a small oil groove for lube in the pin bore.


I don't remember that. Where is the groove?

It`s definitely there. About 3mm wide 1mm deep on both pin holes..Quite hard to see.
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ALTERED IMAGE
 Post subject: Re: Wossner pistons
PostPosted: Sat Jan 20, 2024 4:00 pm 
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Joined: Sun Sep 06, 2015 6:01 am
Posts: 300
Location: Metamora, MI
No holes.
Just the micky mouse ears 0.1mm deep.
160° apart.

Typical on most 4 strokes.




cliff

decimal fixed


Last edited by ALTERED IMAGE on Mon Jan 22, 2024 11:48 am, edited 1 time in total.

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Jim
 Post subject: Re: Wossner pistons
PostPosted: Sat Jan 20, 2024 5:57 pm 
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Joined: Wed Jun 08, 2011 11:34 pm
Posts: 9840
Location: North Central NC
ALTERED IMAGE wrote:
No holes.
Just the micky mouse ears .01mm deep.
160° apart.

Typical on most 4 strokes.


I'm not sure what you mean by Mickey Mouse ears in this case. Something that's 0.01mm deep is only 4 ten-thousandths of an inch deep.

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If it surges, that's normal, upshift.
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ALTERED IMAGE
 Post subject: Re: Wossner pistons
PostPosted: Sun Jan 21, 2024 12:12 am 
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Joined: Sun Sep 06, 2015 6:01 am
Posts: 300
Location: Metamora, MI
Attachment:
mickey.jpg
mickey


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Hawaii-Mike
 Post subject: Re: Wossner pistons
PostPosted: Mon Jan 22, 2024 11:26 am 

Joined: Tue Jul 24, 2012 6:06 pm
Posts: 1137
Location: Honolulu
Wossners are the best for our Kawi triples.

Cruzin Image are the least expensive pistons with good quality.
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