Bore size
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Road Warrior
Joined: Jun 2008
Posts: 1,344
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From: Watertown, CT
Bore size
More confusion :71 shovel
Manual states 3 7/16 bore but I can only find rings for a 3 5/8 What am I missing?
I'm showing 3.430 bore Thanks for info to set me straight
Manual states 3 7/16 bore but I can only find rings for a 3 5/8 What am I missing?
I'm showing 3.430 bore Thanks for info to set me straight
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Joined: Nov 2006
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From: la la land jerzey
first your numbers are incorrect - stock bore is 3.4375 you number is .0075 smaller then that
you want moly rings not full cast -- measure the piston bottom about an inch up between and below the rist pin not 180 from it
you want moly rings not full cast -- measure the piston bottom about an inch up between and below the rist pin not 180 from it
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Road Warrior
Joined: Jun 2008
Posts: 1,344
Likes: 173
From: Watertown, CT
I was hoping you would chime in , so thank you .
What about bore size of 3 5/8 ? Seems to be the only ones I ca find and also seem very popular. Is that an 80 in. ?
Hope you don't mind but in my head I keep calling you Joisy John. Must be from something in my past.
What about bore size of 3 5/8 ? Seems to be the only ones I ca find and also seem very popular. Is that an 80 in. ?
Hope you don't mind but in my head I keep calling you Joisy John. Must be from something in my past.
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Joined: Nov 2006
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From: la la land jerzey
74 inch motor - 3-7/16 bore 3 -31 /32 stroke
80 inch motor -3 -1/2 bore 4-1/4 stroke
3-5/8 bore requires an over size engine block as the cylinders do not just slide in - but the 74 and the 80 use the same block, as the bore on the 80 inch is a .060 over piston bore in a 74 cylinder, but the rods have a different length so it all goes
if you clean the top of your piston carefully, it will have the over bore size on it, and I can give you the correct hastings ring set numbers to get
80 inch motor -3 -1/2 bore 4-1/4 stroke
3-5/8 bore requires an over size engine block as the cylinders do not just slide in - but the 74 and the 80 use the same block, as the bore on the 80 inch is a .060 over piston bore in a 74 cylinder, but the rods have a different length so it all goes
if you clean the top of your piston carefully, it will have the over bore size on it, and I can give you the correct hastings ring set numbers to get
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Road Warrior
Joined: Jun 2008
Posts: 1,344
Likes: 173
From: Watertown, CT
John , you are the man. Thank You. Top of piston has a zero . I believe it should all be stock as its under 10k miles. Must have loaned out all of my stuff over the years and it didn't come back. Ridge reamer ( although there isn't a ridge) cyl. hone , but do have the ring compressor. I was in automotive for many years but haven't done a Harley since my '47 Knuck. I really do appreciate all your help.
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From: la la land jerzey
the hastings ring series number is as follows -- 2M6482 < then it will be marked std - .005 - .010 kind of thing
v twin catalog on line as a guest -- # 11-1368 is what you want
v twin catalog on line as a guest -- # 11-1368 is what you want
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Road Warrior
Joined: Jun 2008
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From: Watertown, CT
Thank you John, I ordered through my local indie. I do have the V Twin catalog. Its been almost as useful as you have been.
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