Maintenance & Technical > KX500 Original

Dry piston install

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martinfan30:
I've been a tech for Toyota for the last 14 years and have never assembled a cylinder dry. I am curious as to why some say that it leads to gumming of the rings.

gwcrim:
Man, dry piston install is news to me.  I started rebuilding engines in the late '70s and I've screwed up my share of times.  I always have lubed the pistons and have never had an issue with that.

KX500freak:

--- Quote from: Albertan on March 02, 2009, 03:45:01 PM ---I'm a follower of Super Hunky (Rick Siemens) on this.  I lube the wristpin bearing, but not the rings or cylinder wall.  As soon as the bike turns over, it is drawing premix in, and it gets lubed that way.  I think oiling the rings and/or the piston or bore just  sticks the rings, and there is no downside to assembling dry.  I know some will say the bike needs lubrication until it fires, but as I said above, as soon as the induction charge is drawn into the cylinder, the premix contains all the lubrication the bike needs.

--- End quote ---


there,s a down side on installing dry imho

all the movement done for check of piston travel and fitment ,
without adding premix to piston and bore.
will cause small sand/dustparticols (if there)to leave their marks on the bore and piston.
oil makes them less harmfull ,because they get weak and will be tranported down by the oil too.

i like a good amount of premix on everything that needs it ,then i let the piston travel a while ,
with moving the kickstarter by hand ,and if its found to be good i stick plug and start it up .

also bare metal on metal itselfs is not what you should want i believe

Hillclimb#42:
 I guess the Dry Piston idea came from the same camp that pins the throttle to break it in. No way, I make sure the piston, needle bearrings, cylinder, everything gets a light coat of oil. Warm the bike up at idle then let cool off. Do that a few times, then ride it easy being sure to change throttle position often. Never riding the pipe until letting the bike cool off again. Then its ready to ride. How is 2-stroke oil going to hang a ring before the heat and friction of a dry cylinder? Never had any problems using pre-mix oil as an assembly lube.

gowen:
In all my years of engine rebuilds (cars, street bikes, and dirtbikes) I've never heard of a dry rebuild and will never try it. Lubing everything works great (for me) and has never let me down.

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