Maintenance & Technical > KX500 Original

Dry piston install

(1/6) > >>

martinfan30:
What are your thoughts? Install a piston dry, or coat it with oil? Does a dry install break in better?

Personally, my thought is to lightly lube a piston, its rings and the bore.

slow600:
i always do my 4strokes dry. lots o science why its better. not so sure about kx

Albertan:
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.

KXcam22:
I may be old school. I lube everything with a nice coat of premix oil and always have.  I have read various theories about "instant glazing" and other bad effects but I am not a believer.  I have seen the effects of "instant galling" with no lube.  Slow600, if you can find any "science" articles to post please do. I am always looking to learn (and maybe change my ways). Cam.

PS. Kind off topic but, the only instant glazing I have ever encountered was a friend adding a teflon oil additive to his not-fully broken in 4-cyl street bike. Engine instantly stopped breaking in. We had to tear it down and deglaze everything.

BDI:
The very first engine I ever rebuilt in my life was a five horse Briggs. I didn't oil the bore or the piston, the piston stuck on the very first pull start attempt. It stuck so bad it took a two by four and a sledgehammer to get the piston out of the block. My father who had been a machinest and who had built race car engines for years looked at me and said "you didn't oil the piston and bore did you". That cost me a whole summer of go-karting. I think anyone who does not oil the piston and bore needs to have their head checked.

Navigation

[0] Message Index

[#] Next page