Cylinder bore time estimate

[Butterfingers]

Short story, I need my cylinders bored out to 20 over. Local shop is giving me an estimate of 2 hours shop time to complete said task. Never had this done before. Am I getting worked over here or is this about average? They were 10 over before taking them in but I broke the lands off my front piston and they need to bored out.

Thanks in advance.

[kombi66]

whats 2 hrs of shop time? i would think anywhere between 150-200 would be fair for a GOOD machinist to do it right

[Butterfingers]

$80/hr. So $160. I'm fine paying it if that's what it takes, I just want it to be done well and for the bike to ride solid for the next several thousand miles. Thanks for the reply.

[BuddhahoodVato]

That's a honest solid estimate, takes time to set up.

[Butterfingers]

Thanks for the feedback!

[farmall]

Who determined that .020"/current plus .010" will clean it up, you or the shop?

.010" steps don't always remove all the taper so be sure before buying pistons.

[Butterfingers]

I haven't purchased any pistons yet. I'm waiting to see what the shop comes back with after they bore. 20 over was an estimate. Thanks for the feedback.

[farmall]

Pistons are normally fitted by honing the cylinder to size after boring, so best quality work is done with pistons and rings in-hand.

Desired piston clearance to cylinder determines bore, and once bored, piston ring end gaps must be checked and gap set if not within limits.

Just be sure you and the machine shop are on the same page.

[slimvulcanrider]

0.020" over or .080 over is still the same amount of time... 2 hours is actually pretty quick... takes time to set up the machine, inspect the cylinder walls before and after punching them out, then it takes time to hone them... all in all it usually takes closer to 3 hours to do it right (for a single cylinder)...

[Butterfingers]

Thanks for the feedback everyone, I appreciate it! I wasn't intending to get in to the engine with this build(my first) so I'm finding myself in new territory. Great learning experience though! Thanks again.