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you cant measure a used ring and come up with a size
you measure with a mike the bottom of a piston 1/2 inch up is fine you need rings for only -- but most piston have the size on the top - look for it first
Thank you Johnjzjz,
This measurement was taken from the location you described. I will keep cleaning the pistons and confirm what is on top but as it is, there is just a letter "C" marked in the top center of each piston.
Today I did the ball hone as you suggested. turned out great!. Thank you.
This was my dads ride. He had it built for him around 1980. I'm excited to put it back together and get it on the road.
Don't forget Extremely hot, soapy water in those fresh Honed Cylinders... wipe with slightly oily rag and rewash if any Black at all!!!
Just me, and since I have the Equipment, I was taught Not to do Valve job without at least Rings, and vice-versa
std bore 80 inch is what you need to order for rings - cast are cheaper and brake in in 20 miles - moly can take a few hundred at least to brake in -and they last longer
An original '77 FLH engine would have had the 74 CID motor with a 3.438 inch bore and 3.968 inch stroke. The later 80" engines had a 3.498 inch bore and 4.25 inch stroke. Someone apparently either upgraded the original motor or slipped in a later 80" engine.
The pistons shown here are apparently period-correct Bohnalite H-D pistons. As such, if they are 80" pistons and the engine is a '77 model, someone must have installed a bigger bore upgrade kit that would probably have been one of those supplied by H-D as a retro modification for the 74" engine.
I'm curious if that engine also has the longer-stroke flywheels since both wheels and pistons came in the H-D 74" to 80" upgrade kit.
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Piston rings for 77 FLH
