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.

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

Used the 3” 240 grit. Did an amazing job on the steel sleeves in this machine for a set of SPI pistons. Compression and performance are still spot on after 800 miles of use. Definitely would recommend.

Worked great

I used this on my 2004 Tacoma when putting in new leaf springs. I needed to clean and grind down a lot of rust on the inside of the shackle that the leaf spring bolt attaches to. This fit, and worked, perfectly! I went a few sizes up on the diameter of the hone versus the hole to be honed so there would be some additional friction and I could get it as smooth as possible. Attached it to my handle held drill and went to town. Would definitely order it again if I needed it!

This is a great upgrade over regular 3 blade hones, especially for those that dont have much experience with regular hones. This hone is very easy to use and works very well, make sure you use a good lubricant while you hone, 10w30 oil is what I used. The one major downside to this and any other ball hone, over a regular hone, is that you can only use this hone for the specific size cylinders. Where 3 blade hones can be used for several different size cylinder bores. Other than that I would highly recommend this hone, it worked flawlessly for me.

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!!!

Honed a Golfcart cylinder in no time, removed fine scratches and ridge at top of cylinder in under 5 minutes. Pricey but cheaper than a machine shop and frankly equal results for all I needed.

Perfect product, great description about getting the right size for my cylinder. Thanks

Used this to hone both cylinders of a 22 hp Briggs VTwin lawn tractor engine that needed a new connecting rod, a new piston and 2 sets of rings. Honing the cylinders is needed to allow the rings to break in and seat properly. Since I don’t expect to do this regularly I was between a cheap set of honing stones for around $20 and the Flex hone which I’d seen on YouTube and was selling on Amazon for $37. The reviews on the honing stones were terrible (cheaply made and inconsistent result) and the flex tool reviews while not numerous were mostly positive. Several excellent YouTube videos by the manufacturer and a call to the seller about whether the 3 inch (180 grit) tool would be good for my 2.96 inch cylinder convinced me it would be worth the extra cost for the Flex hone tool. What a FANTASTIC result in less than 10 minutes to do both cylinders following the video instructions of coating the tool with clean oil and moving in and out of each cylinder for 1 minute. Perfect cross hatched pattern on both. Great tool and good value considering the $200 of parts and many hours of labor to complete this project.