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View Full Version : New engine break in procedure



Troll
06-26-2004, 12:06 PM
4-Stroke


If I had a newly re-built engine, it would have the cam coated in cam lube, then all the top-end rockers, journals and chain pre-oiled well. The cyl. would be wiped down and coated with marvins mystery oil. The rod bearing fully coated with real good engine oil. With all the rotating components being pre-lubed you can be at ease a little more for the break in.
After ensuring the valve clearance and T-chain are adjusted properly, just be sure the timing, carb, oil/air fiter, engine mounts ect are all ok. Possibly even check the oil cooler and lines, being sure there clean and not restricted.
There would be fresh fuel in the tank and carb.
I would use a good quality oil fiter and and honda oil.
The trike would be near the shop with the door open , having quik access to tools and being in a good ventilated area.
Then I'd feel free to kick the engine over a few times with the ign off. Just rotating the componets and getting a jist of compression and stuff.
Now for the question of the break-in period. I would start the engine then keep the rpm at about 900 to 1100 for five minutes. While running check for noises & leaks. I'd check to be sure the oil line's were getting warm after a while, also feeling engine cases ect for warmth.
I let a new engine get to full operating temp. If everything sounds and looks good, put he seat/plastic on, take a deep breath and go for a easy ride. Ride around the local area normally. Stopping, looking, listening checking, feeling ocasionally. Accellerating at a slow/normal pace.
Then take on a fairly long drive, cruising at a normal pace. Get some miles on it. No need for any full throttle blasts, wheelies or doughnuts. Just letting the engine do it thing. Rings are working in with the cyl wall, oil slinging around, parts rotating ect. Good stuff happening.
After going back to the shop, do a final once over.
I'd change the oil and filter again, then adjust the valves. Retighten all mounts, exaust sys, ect.
I'd ride it faily easy for as long as you can stand it. Not truly babing it, just not going ball's out for long perods of time. Let the engine brake in normally.
When I start a cold engine, allways let it warm up for a bit. Then ride slowly at first till the engine warms-up.
I'm sure there could be other thing's, lets hear them.....................:thumbsup:

my90rulz
08-15-2004, 07:26 PM
dont oil the rings lots of mechincs tell you to but there wrong dont...all it dose is glaze over your nice new hone marks thus takeing longer to break it in..it will get all the oil and lubrication it needs from the new oil and it will break in much faster :)

Mr. Richard
08-16-2004, 12:36 AM
you mean start a newly rebuilt motor dry????? i think your way off base on this one. oil will not glaze ,,, i might not use synthetic oil but i would NEVER start a new motor dry!!!! :nono: :nono:

350XXX
08-16-2004, 12:45 AM
the 350x service manual even says to oil the rings in it.

my90rulz
08-16-2004, 01:20 AM
oh sorry i wasnt payin attion i ment for 2 smokes :doh:

Mr. Richard
08-16-2004, 10:18 AM
2 or 4 it doesn't matter. especially a two stroke DRY no way,,,

my90rulz
08-16-2004, 01:57 PM
im sierous 2 stroke dry it works much better than lubin up the rings it will get all the lubriction it needs from the gas

Mr. Richard
08-16-2004, 08:18 PM
just cuorious,,,, how many engines have you built and broke in? just wonderin if your talkin from expierence or hearsay?

Black Sheep
08-17-2004, 12:32 PM
Well i'm talking from experiance (i've built hundreds of 2 stroke motors including motors for national MX pros) and i always put the top end together dry. not one motor ever had a problem. most anyother builder i know puts them together dry as well. Oiling the rings before hand can cause a gauling effect on the cylinder wall and or rings. And, since two strokes have the oil mixed in the gas the instant the motor fires the rings are getting lubed anyway.

Mr. Richard
08-17-2004, 03:39 PM
kool,,, i have never in my life put one together dry ,, so i would say its not a big deal either way,,,,, the honda service manual says oil them too,,,, so i will continue to oil like i always have,,,:D :D :D

dads
08-17-2004, 10:58 PM
and most books will say lightly oil the cylinder and rings. To help on the install.

Mr. Richard
08-18-2004, 12:42 AM
i have several HONDA service manuals ,,, they ALL say to lightly coat piston and rings before install,,,,,, so what? are they wrong too?????? :rolleyes: :rolleyes:

350XXX
08-18-2004, 04:12 AM
one of my buddies bought a KX dirtbike for his kid and the owners and service manuals on that particualr bike says to not oil the rings, but that is the only one i have seen that says that, but it does say to relpace the rings after the first 10 hrs of use and every 40 hrs thereafter. i guess it depends on how often you plan on replacing the rings, for example if yoou were racing a machine and wanted optimum compression to replace them more often?

Mr. Richard
08-18-2004, 10:14 AM
the KX probably has a nikisil bore which it totally different,,,

Black Sheep
08-18-2004, 10:56 AM
Originally posted by kasey
i have several HONDA service manuals ,,, they ALL say to lightly coat piston and rings before install,,,,,, so what? are they wrong too?????? :rolleyes: :rolleyes:


the owners manual also says to run 20:1 gas ratio...DO YOU???

it also says to replace the piston and rings every 20hrs...DO YOU???

it also says not to jump or ingage in stunt riding...DO YOU???

i seem to remember mentioning something stated in the owners manual to you before and you did not agree with it.

my90rulz
08-19-2004, 10:06 PM
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