2 stroke vs 4 stroke running in..

[bleeeek]

Firstly sorry if it have been asked or this is a stupid question to ask. Im just in a process of learning all these..Okay im more familiar with normal 4 strokes engine than 2 strokes.. What i want to zoom on specifically is the running in process..

 

I understand when an engine is running in, be it 4 or 2 strokes, it just involves making the engine component such as the pistons piston rings and cylinder sit more accurately and nicely together. This process would result in tiny metal fillings that are so called scrubbed off. Now my question is i know for 4 strokes engine, after the running in process, the engine oil will now be dirty with the fillings and so have to be replaced.. But is it the same with a 2 stroke? or the metal filling just would be shot out off the exhaust port?

[DM]

no. your 4T would still need to be changed if that is what you are trying to save. the tranmission; gears are bathed in that oil and they wear down as well.

[guoliang]

it depends on what you did.

i just changed my piston and my mech told me there's no need to change.

[Pandoras Kitten 3]

I will run in 2 strokes and 4 strokes the same way; mototune USA style. The idea of regular EO changes during break in is to get rid of metal shavings created as new parts hone in.

 

I haven't taken apart 2 strokes to see what goes on inside, but as most of the wear occurs during "the first 20 miles", a quick EQ change soon after collecting the machine, and temporary 500km oil change intervals (up to 1500km) would keep your sump free from wear-in debris.

 

Yes, some old-school mechanics don't know this.

 

They also tell me not to do any sprocket tuning to optimise RPMs (simplest way to save fuel and long term wear & tear... and I don't like when people raise their voice and act all negative to new ideas, when they don't ride the bike :3)

 

Some also ask me to use XYZ engine additives that will destroy my clutch plates and degrade engine efficiency.

 

Thus, trust yourself, not the mech :3