dabears_25

hey tigmaster i have two bike that i will be rebuilding before the next season
one's a 92 yz 125 and the other is a 93 kx 500 what oil ratio should i use on these bike for the break in and after. and also that break in procedure about how long total time does it take. thanks for the info

tigmaster

u can easily get away with 32:1. a lot of people dont even change up their mixture for break in but its really suggested. after, if u plan on using synthetic then u can run anywhere between 40:1 and 50:1. mineral oil, stick with 40:1. wat did u run before? if it was different then u need to rejet, heres the how-to article on it: http://www.mototips.com/how-tos-perf...your-ride.html

as far as break in time, around an hour. i think i list times in this break in article.

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wr250f95

ya, but you dont want to mix synthetic with mineral remember that

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"LIFE'S JOURNEY IS NOT TO ARRIVE AT THE GRAVE SAFELY IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN SIDEWAYS, TOTALLY WORN OUT, SHOUTING'...HOLY S**T... WHAT A RIDE!"

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tigmaster

yes, lets all remember that lesson!!!!!!!!!

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dabears_25

ya i had to learn the hard way remeber

tigmaster

ya, i still can believe that you had your engine be destroyed by mixing 2 different OILS. its not like you didnt have oil, just to sets of them that combined with the gas differently. think about other oils, such as synthetic blend. they mix synthetic with mineral oil....

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dabears_25

ya i will definetly stick to one 2-cycle mix on my 500 when i get it rebuilt. i can't wait to feel the power. i just want tho thank you and wr250f95 for all your guys knowledge. oh ya how can you tell if your putting the piston in backwards. thanks

tigmaster

there are alignment marks, either a dot or arrow that should go towards the front of the engine.

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wr250f95

ya like tig said, helping is not a problem, its what forums were created for

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"LIFE'S JOURNEY IS NOT TO ARRIVE AT THE GRAVE SAFELY IN A WELL PRESERVED BODY, BUT RATHER TO SKID IN SIDEWAYS, TOTALLY WORN OUT, SHOUTING'...HOLY S**T... WHAT A RIDE!"

this, is why I ride.

Rekd

Great article. Mostly.

As a machinist who deals with metal heating and cooling, expanding and contracting, and literally changing it's molecular and even it's metallurgical makeup on a daily basis, I can assure you that letting your motor cool during the break in period DOES do a lot more good than not letting it cool.

All one needs to do is study the effects of thermal expansion, annealing and other effects of heat on metal to realize that the motor should be allowed to expand and contract during it's break-in period uniformly. That's why it is suggested that you "let the motor warm up completely" before breaking it in, because you don't want some of the parts warm and the other's cold.

Different metals, and indeed, different thicknesses of the same metal, will expand and contract at different rates. So letting the motor sit for 5 minutes while you look things over will allow some parts to contract from cooling, while others remain hot.

Then you jump back on and start going 1/2 or full throttle, and you're essentially running it with the smaller parts cold and the bigger parts hot. Not a widely recommended procedure.

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