I do hardly 100KM runin
got 2 bores with me, both have done runin <100KM within 2 days hehehe
first day 60KM just after teh rebore, next day 40
There is a lot thats imp inside teh engines that contribute to run-in. most imortant being piston clearance
less piston clearance, more chances of seizure and takes more run in time. too much, you'll lose compression, engine heats up like crazy.
NEVER ride at a sustained speed/rpm for any length of time EVEN IF you are below the accepted limits - keep changing the RPM and speed by changing the throttle position at short intervals to prevent glazing of your piston, and also getting the various moving parts bedded down nicely at different speeds. What this does is makes the bike smooth and the power delivery seamless across the entire power band rather than just at one particular speed.
this point is very true. my first rebore, drove @ constant RPMs, bore got slightly glazed. tryin hard to remove it now...
One more important thing i like to add..
.Always run rich during run-in. i used some oversize jets and richest needle position when running in. gave me just 20KMPL, but tehre is no chance of seizure due to leaning. the bike will run like absolut shit, but its worth it.
When starting, i start with choke, keep holding it and idle for...30 secs? I keep feeling the bore to check the heat. Once its warm, take it out slowly for 2KMs...then do the usual commemorative ton
During run in, I do this everytime the engine becomes cold and have to start, not only just when starting in the mornings.
bah...i'm a 2 stroker
both these articles are for 4 jokes
hehehehe
for timepasss, see this :
"Blowup of the month"