I'm going to do a top end on the old 02,what type of ball hone do I need and what grit and size, and where can I get one.

Thanks
Stewart Frank
02CRF450
STORM#422

I got mine through MSC. Someone correct me if I'm wrong, but I believe this is the size and grit you need.

http://www1.mscdirec...672676&PMT4NO=0

Throttlejockey said:

The photo does not show a ball hone.

These guys can help you out. http://www.brushrese...roducts/GBD.htm

Use a ball-hone with a diameter that is slightly smaller than the cylinder bore size, 240-360 grit, and made of aluminum-oxide material.

Check out this site:

http://stores.ebay.c...1QQftidZ2QQtZkm

yeah, those are the Brush Research hones I believe

CharlieT said:

That's a good deal. Those are the same ones I posted the link for, but better prices.

The manual says the bore is 3.78", so this 3.75" sould work. They said the hone for 3.75" is good for born sizes 3.25" to 3.800". This is the one I'm looking at on ebay. 3 3/4" Engine Cylinder FlexHone 3.75" Flex-Hone 240grit.
$39.99

Stewart Frank

I am sure you could squish a 4" in there and do a great job. Don't go too small. :ride:

I used a 4 1/8" brush research hone on my 450 cylinder. Worked just fine.

Was that the 180 grit?

Stewart Frank

CharlieT said:

Smaller? I think you brain farted there...You want it about .125 larger at a minimum.

How skthom2320 smushed a 4 1/8" hone in there I dont know....pretty tight..just a about a garauntee you got the new portions of the hone balls the way the thing must have had to lay over to get in there...

The 4 1/8" 180 grit hone says it is for bores sizes 3.625" to 4.155", so being the 450 is 3.78" it sould work, right?

This brand new sealed in package engine cylinder hone is for 3.625" to 4.155" BORES. That includes the popular engine bore sizes of 4.00", 4.030", 4.060" or 400 blocks of 4.125" or 4.155" inch bores. Perfect for ALL ENGINES. The hone is made by the one of the best cylinder hone manufacturers. The hone is 180 grit, GOOD for reringing jobs or final bore. The actual tool is rated at 4.125" diameter but we have successfully used it to 4.155" bores. This patented Flex-Hone is the best way to create a Cross Hatch surface finish with suspended globule working abrasives. Contact us for more information as we use this hone on all of our race motors. Most of the engine hone articles reference this exact brand and type of tool. THIS TOOL HAS THE LONG SHAFT for engine honing.

Stewart Frank

Shawn_Mc said:

From Eric Gorr's site:

"Honing the Cylinder Bore

Many people have emailed me with questions regarding honing cylinder bores. If you want to buy a hone to deglaze bores or polish off small scratches, then a ball-hone is the best choice. Ball hones are manufactured by Brush Research in Los Angeles, under the brand name Flex-Hone. These hones are available under different labels and they are most easily available from auto parts stores. Buy a size that is 10% smaller than the actual bore size. These hones are available in several different materials and grits but the profile that bests suits both steel and plated cylinders is aluminum oxide 240 grit. A ball hone cannot remove material from the cylinder bore, especially on the hard nickel plated bores. However a ball hone can polish down the peaks of the original hone scratches and increase the bearing ratio. In other words the piston will be touching a greater percentage of the bore. Sometimes that makes the piston wear quicker but if you have to ball hone the bore to remove scratches, it's a compromise. The one type of hone that you should never use on a two-stroke cylinder is a spring-loaded finger hone. The sharp edges of the stone will snag the port edges and most likely damage the hone and the cylinder. "


Now, I've never used one that much smaller than the actual bore, but on all our 54mm bore 125's, I've always used a 2" hone, which is about 1/8th in smaller than the actual bore. I think the one I used on the 450 is a 95mm. You're not trying to remove any metal here or change the dimensions of the cylinder at all so you don't really need much of any kind of cylinder wall pressure. THe hones are on a long flexible shaft, which when spun in a drill will actually swing in an arc greater than their actual circumference.

CharlieT said:

That's for a 2 stroke cylinder with port passages.

Actually it doesn't make a difference whether its 2/ or 4/. On the 2/, I generally used a flap/brush hone, as there is potential for the balls on a ball hone to bounce in and out of the ports. All your doing with the ball or brush hones on a coated is basically deglazing them, so the hone size related to the actual cylinder diameter makes no difference be it a cylinder from a 2/ or a 4/. On a 4/, if you want you could also use a conventional 3-stone springtension hone with the proper type/grit of stones. I just prefer the ball hone because it is cheap, quick and easy to use.

i really like a ball hone that is larger than the hole I'm doing,
i use the 4.00" ball hone on 250 2 stroke and the 250 f's and the 450 f's and have no problem what so ever,

when you use one that is undersized it just does not work as well or fast :excuseme:

Kelstr, I don't see a 4" ball hone on ebay but they have a 4 1/8 ball hone 180 grit. Do you think that would be good?

Stewart Frank

stewart_frank said:

yes , the 4 1/8 " 180 grit ball hone will be just fine :thumbsup:

i kinda said that wrong when i said 4.00 " hone,
---i should have said ,---a hone for the 4.00" bore of a small block chevy ,-- :excuseme:

and that hone is a 4 1/8 " ball hone , :thumbsup:

Thanks Kelstr, I'm ordering one tonight :ride:

Stewart Frank