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  #1  
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RicThompson RicThompson is offline
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Default math problem, piston rings

I need to order piston rings for my 900 with a 3 inch bore which is now .040 over. I figured I could find rings that were +.040 but Dennis Kirk sells them like 3.197, 3.207, 3.217, etc. I seem to have missed that math class. Which set is it and how do you compute it?
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forqueue forqueue is offline
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No idea. But Bill has what you need.
.040"
HD 22360-57A
https://www.billscustomcycles.com/sportster/rings
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Originally Posted by forqueue View Post
No idea. But Bill has what you need.
.040"
HD 22360-57A
https://www.billscustomcycles.com/sportster/rings
OH NO! Not a cast oil ring. LOL

Sorry I'm looking for 3 piece oil ring. I just need to order the correct size.
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needspeed needspeed is offline
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Those numbers are the oversize added to the standard bore size. So standard bore = 3-3/16 or 3.1875.

3.1875 + .020 = 3.2075
3.1875 + .040 = 3.2275

Looks like they don't include the 5 in the part number
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Originally Posted by needspeed View Post
Those numbers are the oversize added to the standard bore size. So standard bore = 3-3/16 or 3.1875.

3.1875 + .020 = 3.2075
3.1875 + .040 = 3.2275

Looks like they don't include the 5 in the part number
900 standard bore is 3.0, 1000 is 3-3/16 correct?
900 standard ring would be 3.005
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Yes, your right. I forgot you're working on a 900. Standard bore 3.000
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A quick look over at Hastings revealed they only have STD rings for the 900. Seems odd they only have STD for the 900, while they have oversized for 1000 motors.

Typically they are good at responding to e-mails. When I had questions, I had responses same day or next day at the latest.

If you strike out elsewhere, I'd suggest an e-mail to --> info@hastingsmfg.com <-- . They might provide a recommendation (or not).
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hastings 900 cast rings w/3 piece oil ring +.040 VTwin #11-0104 "in stock"

std thru .070 in .010 steps
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Originally Posted by ryder rick View Post
hastings 900 cast rings w/3 piece oil ring +.040 VTwin #11-0104 "in stock"

std thru .070 in .010 steps
please check link. It's some kind of shower for a tub.
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please check link. It's some kind of shower for a tub.

Link this 900cc-piston-ring-set-040-oversize
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