Brush Research FLEX-HONE Cylinder Hone, BC Series, Silicon Carbide Abrasive, 3 (76 mm) Diameter, 240 Grit Size

This is an easy way to remove a small amount of metal from cylinders. It creates a smooth surface. I would recommend this item to others who wish to enlarge the inside of a cylinder.

So I have this 1982 Honda Magna I recently acquired which needs some love to get back on the road. Apparently the previous owner dropped the bike while loading it on a trailer, decided not to fix it and let it sit for a few years. The sight glass was busted on the clutch master cylinder so the fluids drained out of the main chamber and after a few years of sitting, the rest of the fluid turned into some kind of green alien substance... After stripping some screws trying to get the thing took apart, I discovered the piston was quite stuck in the chamber - which required me to drill through the top of the piston, insert a metal screw and pry the b***h out with a crowbar. What I found in the chamber was nothing short of horrific - a nice thick black coating of whatever the brake fluid turned into after all these years. It looked like carbon, and it was impossible to get scrubbed out with brass bore cleaners or soaked out with anything I had available (which is a lot of stuff). I searched around for potential replacements on eBay, but there was nothing that looked like it would be a sure buy that would work - especially for the money these people were asking. So, I have to make this work... Eventually I gave up on the fruitless manual labor and tried to find another solution. Stumbled across honing engine cylinder and started looking for really small honing tools (5/8 or 16 mm). Found this, got it today, attached it to my drill, doused the cylinder and this tool with brake fluid for lubrication and let it go to work.... Freaking awesome results!!!! I got the 120 grit one, so once I get the OEM rebuild kit here, I will do a test fit and if things look snug, I will get the 320 grit brush and finish it up. Very happy to finally be able to move past the roadblock and get onto other stuff on this bike!!!

I use it for cleaning up a ported cylinder

These are very easy to use Time will tell how long they last

Used this for refinishing a plow piston cylinder. A lot of people complaining about the price but this is much cheaper than any other available option, whether sending out to get machined or buying and actual hone setup for at home.

I have six of these now, and I buy a new one if I need a size I dont have. They work perfectly to take the glaze off of a motorcycle cylinder before installing a new piston and/or rings. They are sturdy, and last a very long time if treated well. Pro Tip: Dip them in transmission fluid before honing.

Ive used these dingo-ball-hones in the past, and they work as well now as they ever did. This go-round was for a dirtbike cylinder, and the hone fit nicely, and cleaned up the bore to put a cross-hatch pattern into it. This ought to let the rings seat well when I finish the assembly. Watch some youtube videos if you need a tutorial, lots of them out there.

I have personally relied on products from this company for a very long time in a professional setting. As far as ball Hones go Flex-Hone is the best and has been. The quality is top notch and the number of sizes they make are unequalled by any other company

Was easy to use

Used this for my Predator 212cc go kart build, where I was swapping to a flat top piston for additional compression. While the cylinder didn’t look bad to begin with, this hone made it look great. I coated the hone in oil and utilized it for around 30 seconds per the instructions. Can’t wait to use its again on the next build!