Wednesday, January 11, 2017

Cylinder Boring and Honing Services

Scottie's Workshop has a full service motorcycle Machine Shop specializing in vintage BMWs.

One does not remove engine cylinders everyday; normally it is part of a major engine overhaul. So we don't just bore and hone cylinders; we refurbish them.

First, push rod tubes are removed and the cylinders bead blasted to remove all rust and old paint.

The cylinders are then bored and honed cylinders in the time tested way: on a boring machine or engine lathe based on the measurements of the new pistons.  Honing is done using Sonnen style parallel stone hones and cylinders will be cross hatched with a ball hone.

Pistons are weight matched and we can lighten your wrist pins about 14 grams for an additional $75.

Piston skirt clearance is determined by the piston manufacturer. When possible we prefer to use new KS pistons (many of which we have in stock).

The cylinders are then taped up and painted with high temp semi-gloss black and baked in the oven to cure.

Pushrod tubes can be cleaned and reused if desired, or we can install new ones made from stainless steel.

Machine Shop time to bore and refurbish a pair of cylinders is about 2.5 hours. We can provide services individually if you like.

When shipping cylinders to us, DOUBLE BOX each cylinder and insure them for damage.  They are quite delicate!!
 


We will only bore cylinders if you ship us the pistons to be used. 
We hone based on the measurement of the piston.
Even pistons from the same manufacturer vary; we do not recommend boring/honing "on spec".



We can bore your cylinders with the push rod tubes installed, if you wish.



Your cylinders and pistons will be shipped back to you cleaned, oiled and ready to install.