Working on a custom( not even sure of brand) and redoing the top-end and it needs new pistons. They have a harley # of 22091-830 and cylinder # 16584-83B. The pistons are std bore and measure right at 3.49" I need to know what pn# to order for new pistons. Before I call and have to deal with the stealership..are these the numbers I need to use to re-order pistons for the rebuild?

 

The part numbers you have are correct, however you cannot buy either separately. The cylinders for 1340 Evos can only be purchased as a kit which comes with a piston kit (piston, rings, pin and locks).

The pistons can each be purchased as a kit. Part# 21940-83 for 1 piston, standard size 3.498 with rings. locks and pin. The rings can be purchased separately, Part# 21920-83 and that's for 1 cylinder only.

If you're not going to oversize the cylinders, and assuming the pistons aren't damaged and/or the wrist pin bushings need replaced, I'd recommend simply buying new rings, scuff hone the cylinder with a 240 grit ball flex hone and leave it at that.

 

Thanks for the info...One piston is shot so I think I will just look into the whole kit with everything

 

You're welcome. The number for the cylinder and piston kit together is 16512-86A (black) or 16510-83A for the silver finish. They are pre-honed/fitted from the factory and about 275.00 each, list price.

 

I have 97 Fat Boy Evo rebuilt in US. On cylinders is written 16548-83A. Help me please, what does it mean? It is stock cylinder or big bore?

 

BigLebowski, you can't tell without pulling it apart and measuring. The cylinder with the OEM part number on it would indicate that's a HD cylinder, but if someone has been into it, you don't know what they did to it. It could be anything from nothing at all to something crazy.

 

I assume you mean to say it's cast into the cylinder on the cam side at the base. Yes, that's a stock cylinder. It may have been bored for an oversize piston, but the spigot (cylinder liner protrusion) is stock diameter and the engine cases have not been bored... if that's what you're asking.

The reason you cannot reference that number is because HD will not sell a cylinder alone for the 1340 Evo, it comes in a kit with piston, etc. as mentioned in previous posts. Sportster cylinders can be purchased separately.

 

Thanks guys for info.

 

Have the cylinders "miked" then buy a good quality set of forged pistons with a decent set of valve reliefs. The valve reliefs will allow for future cam improvements. Then have your cylinders bored by a reputable shop. Your cylinders have been heat cycled and will remain truer than a new set. Hope this helps.