Maintenance & Technical > KX500 Original
Break In Secrets.
Motorrad:
--- Quote from: kaw rider on December 18, 2010, 12:15:47 PM ---Doug here you go
The idea of the Lawnboy or chainsaw oils is that they are ashless, that means phosphate free. Phosphates are what causes the cylinder to glaze under no load conditions. High octane race fuel has a ton of phosphate. so best to avoid it during break in. 87 oct. no lead, while not phosphate free has much less.
from max power site.
For 4-Stroke engines we recommend high quality petroleum based motorcycle oil. Many of the non-synthetic OEM engine oils work well and allow the rings to seat quickly. Do not use full synthetic or semi-synthetic oils for break in they are too slippery and keep the rings from seating on the bore. For 2-Stroke engines we recommend Yamalube R mixed at 32:1, we have no confidence in wild 50:1 or 80:1 claims by oil manufacturers. Oil is cheap and piston and cranks are not.
Did your plating look like this. This engine was put together to check everything. The top end was installed with the piston rings on the piston inside of a lightly oiled bore. I rotated the crankshaft a few times and started to notice this pattern. Just from hand movement of the crankshaft the plating started to score.
--- End quote ---
I have to ask... who plated this CYL?
ThrottleJunky:
Looked like a bad bond.
kaw rider:
Millennium
DoldGuy:
Have the cylinder stripped down & will box up to ship out tomorrow. Will give you guys an update on their response once they inspect it.
DoldGuy
coalpilot:
You don't think the guy on the assembly line testing the motor doesn't have it pinned wide open pretty much right off the bat for an extended period to seat the rings???
Last topend I put in I used reg pump gas, klotz at 32:1, warmed it up, checked for leaks etc, then rode it like I normally ride and race..that was 5yrs ago. I just tore it down this year 'just because' cyl still looked new and no blowby past the rings. After breakin i used motorex at 44:1 and sunoco high test. So, yes I believe in what mototune is talking about.
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