Z1 - Flex Hone for Cylinder Refresh.

Why did you take engine apart? What model and mileage?

car5car wrote: Why did you take engine apart? What model and mileage?

1975 Z1-B 900. Odometer reading 18500 miles or 'thereabouts' Thereabouts being the key. No service history etc.. Fleabay purchase. I trust my eyes more than I trust Fleabay User Feedback.

See my post in the 'Projects' section.. One of the PO's (previous owners) decided that it was easier to paint the engine than to clean it properly. As I'm already torn down to the upper cases, it makes sense to inspect/service/recondition everything that I've had to remove to reach this point. Valves/guides/seals/springs, - piston rings + cylinder hone - cam bearings? (maybe).

Why do you ask?

Ive used the ball hone with mixed results. I have the 70mm brush and used it numerous times on the 66mm holes. It does not take that much material out, I've tried! Your lucky if you can take a couple tenths out.
Some blocks worked just fine and others began to smoke not long after start up. I became tired of taking the motors back apart and I take all my 900 blocks and bore them to 1015 now. I believe some of the blocks have wear that cannot be fixed without making the bores round again.

etbike3135 wrote: Ive used the ball hone with mixed results. I have the 70mm brush and used it numerous times on the 66mm holes. It does not take that much material out, I've tried! Your lucky if you can take a couple tenths out.
Some blocks worked just fine and others began to smoke not long after start up. I became tired of taking the motors back apart and I take all my 900 blocks and bore them to 1015 now. I believe some of the blocks have wear that cannot be fixed without making the bores round again.

The situation you describe is not a hone problem.

BTW, a 67mm hone is a much better fit for use on a 66mm bore than a 70.

The ball hone is used for just what we have been discussing, cylinder glaze, quick rebuild, etc. It's hardly the tool to make any sort of adjustments to a cylinder. In that case you would use an adjustable hone like: www.amazon.com/Lisle-LI15000-Engine-Cylinder-Hone/dp/B000GKIE4S

The ball hone DOES remove material if you use it too long. I tried cleaning up a cylinder once, last resort before replating, and cut through the chrome plating. Follow the video, zoom, zoom and you're done.

Nessism wrote: The dingoball hones are best for used cylinders since they will conform to the wall. Straight hones can skip over spots.

enginehones.com is a good resource. www.enginehones.com/fl2to2.html

I bought a hone for my 750 cylinders that I'll offer up on loan. PM me if you live in the US and want to discuss.

A fixed hone will give you a better idea of the condition of the bore.