Wrist pin clip fail
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Joined: Oct 2007
Posts: 70
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From: Alberta, Canada
Wrist pin clip fail
Damaged front cylinder in my 80" EVO when the clip fell out but it was wasn't ran for long like this. I thought I had them in tight but was wrong on one as it came out. This is a fresh build with maybe a mile on it.
The cylinder has two groves from the pin and is likely a write off from what my machinist said, he figures it is oval shaped now.
My question is about replacing just the front cylinder with another good used one.
The barrels were both stock bore 3.498" so the rear one is like new. I would have the pair bored out a bit as I have to buy new pistons anyway. I just hate buying a pair of cylinders if I can just install a single.
I am getting my bottom end rebuilt and balanced as the pin jammed and now it has quite a wobble so I would like to save money where I can.
The cylinder has two groves from the pin and is likely a write off from what my machinist said, he figures it is oval shaped now.
My question is about replacing just the front cylinder with another good used one.
The barrels were both stock bore 3.498" so the rear one is like new. I would have the pair bored out a bit as I have to buy new pistons anyway. I just hate buying a pair of cylinders if I can just install a single.
I am getting my bottom end rebuilt and balanced as the pin jammed and now it has quite a wobble so I would like to save money where I can.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
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From: Haslet Texas
My question is about replacing just the front cylinder with another good used one.
The barrels were both stock bore 3.498" so the rear one is like new. I would have the pair bored out a bit as I have to buy new pistons anyway. I just hate buying a pair of cylinders if I can just install a single.
The barrels were both stock bore 3.498" so the rear one is like new. I would have the pair bored out a bit as I have to buy new pistons anyway. I just hate buying a pair of cylinders if I can just install a single.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Just a thought.
Road Master
Joined: Feb 2014
Posts: 913
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From: indiana
how deep is the groove from the pin only a mile on it cant be to bad. I bougt a motor a few years ago same problem the guy rode it till it lost all compression and I was still able to use the cylinder at .020 over.
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Joined: Oct 2007
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From: Alberta, Canada
D_gyver - I thought I would be able to bore 20 or 30 thou but my machinist thinks the cylinder is out of round and would cause issues. I will look at it again with him to make certain.
texashillcountry - I just happen to have a fresh can of wrinkle black that will come in handy if I do replace the cylinder.
texashillcountry - I just happen to have a fresh can of wrinkle black that will come in handy if I do replace the cylinder.
Road Master
Joined: Feb 2014
Posts: 913
Likes: 5
From: indiana
D_gyver - I thought I would be able to bore 20 or 30 thou but my machinist thinks the cylinder is out of round and would cause issues. I will look at it again with him to make certain.
texashillcountry - I just happen to have a fresh can of wrinkle black that will come in handy if I do replace the cylinder.
texashillcountry - I just happen to have a fresh can of wrinkle black that will come in handy if I do replace the cylinder.
if hes checking the cylinder on the bench it will be out of round he has to use torque plates to check the cylinders
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Road Warrior
Joined: Dec 2007
Posts: 1,666
Likes: 3
From: Styxville
And if it is out of round, he should be able to rebore to round again -- with torque plates. Is this a Harley-experienced machinist?
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Joined: Apr 2007
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From: Brighton, MI
Isn't "out of round" more of a long term wear issue? I understand the damage from the clip, but not an "out of round" situation on new or freshly bored cylinders.
Yes, I agree cylinders need to be checked on torque plates. YD
Yes, I agree cylinders need to be checked on torque plates. YD
