Running in a two-stroke engine?

[Beeza]

Great stuff! Two-strokers are pretty addictive beasts.

[Rupe]

I've been doing it the mototune way for many years with many High performance 125cc 2 smoke Kart engines etc on Methanol, avgas and petrol. Don't take it to easy. I don't even start mine in the garage (well maybe for 30 secs max just to make sure it goes) then take it out and load the rings. Off and on throttle for a lap or so. Come back checkout water level etc, let it cool down then ride it like you own it, no constant throttle. Always had good ring seal, long lasting engines and fast ones to!

Read the mototune pages it really does work!

There are quite a few threads and posts on this in the Off road forum do a search!

Just my way each to their own??

Did that on my 2stroke, and 4stroke dirt bikes. Both were mint.

Reckless knows his 2stroke engines thats for sure....do it his way it's cool.

[warewolf]

I think the mototune method is designed for maximum power but the lifespan of an engine run in that way is questionable.

The biggest problem with modern road bikes is that the materials are too good, the oils are too good, and they make too much power to be loaded up properly to seat the rings and avoid glazed bores = less reliable due to bore-wash, blow-by etc etc.

If you do think the mototune method is too harsh, then following the manufacturers run-in procedure you should at least use a more aggressive schedule than theirs, eg 100km earlier 1000rpm higher 10% more throttle load, at each step.

Mototune FTW.

[McWild]

This has been a really interesting thread. Lots to think about!

[marsheng]

Thanks for all the replies, yesterday i fitted a new piston and new head etc i warmed the bike up and let it idle for 5 mins then took it for about about a 3 kilometer ride in first gear. Then I let it cool and later in the afternoon did it again and gave it a good run. it runs mint!! I am really stoked with it.

Warm the bike up, air cooled 30-1 minute, water cooled 2-3 minutes. Work the bike to 1/2 or 3/4 throttle under load for a 10-15 seconds. As the rings bed in, they produce a bit of extra heat from friction. It only takes 15 seconds for the cylinder/piston to heat up, let it cool down for a minute or 2, run again at 3/4 throttle, again at 7/8 and then race.