Buggies Gone Wild Golf Cart Forum - View Single Post

Universal_Mechanic · 06-24-2011, 06:37 PM

Missed part of your question. We're always buy the parts seperate from yamaha. Were stocked up in fact, we do a lot of them :). You'll need:

Oil seal - clutch side
Oil seal - flywheel side
Crankcase gasket
Valve cover gasket
Head gasket
Intake valve seal
Ring set

You should:
Clean and lap the valves
Hone the cylinder
Check ring end gap, should be between .005" - .010". Any more than .010" I'll file down a set of .025" oversized rings to .005". Any more than .020" ring end gap, you'll need a machine shop to bore the cylinder .025" over and get an oversized piston. In order to determine cylinder wear, you need to install a standard compression ring into the cylinder and measure the end gap with a feeler gauge. Make sure to use the cleaned off piston to push the ring down a 1/4 of the way each timre and take 4 measurements, to ensure you do not have a taper worn cylinder, in which case you will need a bore job done.

Sorry to get so technical, but if you put new rings into a worn cylinder, it will probably still smoke (if oil burning is indeed your problem)

06-24-2011, 06:37 PM	#5
Universal_Mechanic Not Yet Wild Join Date: Apr 2010 Posts: 28	Re: Few questions for G9 rebuild. Missed part of your question. We're always buy the parts seperate from yamaha. Were stocked up in fact, we do a lot of them :). You'll need: Oil seal - clutch side Oil seal - flywheel side Crankcase gasket Valve cover gasket Head gasket Intake valve seal Ring set You should: Clean and lap the valves Hone the cylinder Check ring end gap, should be between .005" - .010". Any more than .010" I'll file down a set of .025" oversized rings to .005". Any more than .020" ring end gap, you'll need a machine shop to bore the cylinder .025" over and get an oversized piston. In order to determine cylinder wear, you need to install a standard compression ring into the cylinder and measure the end gap with a feeler gauge. Make sure to use the cleaned off piston to push the ring down a 1/4 of the way each timre and take 4 measurements, to ensure you do not have a taper worn cylinder, in which case you will need a bore job done. Sorry to get so technical, but if you put new rings into a worn cylinder, it will probably still smoke (if oil burning is indeed your problem)