StillLearning
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Originally Posted by Panos
You worry too much.My Kawasaki 249cc engine does not operate smoothly under 2500rpm under acceleration and breathes nice only after 6000rpm.I use it daily to go to work short tripping it (today work spot is 9kms,but for most years was 4kms)...since 2009.So everyday "the little engine that could" is seeing 6000-8000rpm with cold oil temperatures (10W40 viscocity is all I ever used) for 70.000km and still going strong,with zero oil consumption (every 6000km OCI) and a nice UOA I did last year for the first time.So your redline rpms is my everyday midrange rpms when cold with no issues.I would keep rpms no lower than 2000rpm and no higher than 3500-4000rpm and call it a closed case.
I think this all relative. As a percentage of your usable rpm range, you are really not revving that much higher than a typical car engine. I have a little 250cc Suzuki, which is similar, and it has a red line of just under 10k rpm from what I have read (no tach on the bike). I would correlate 5000rpm on the bike to about 3200 or 3300 rpm in my car, or half of red line rpm.
Also, props to you if your riding that thing in sub freezing temperatures!! I have ridden in weather as cold as about 45 degrees F and that was plenty cold for me. I actually tried to start it one morning after sitting in my shed overnight on a single digit temperature night, as it was blocking my snow blower and I figured it wouldn't hurt it to run it for a while, and it wouldn't even turn over fast enough to start. That was with Valvoline 20w50 motorcycle oil.
You worry too much.My Kawasaki 249cc engine does not operate smoothly under 2500rpm under acceleration and breathes nice only after 6000rpm.I use it daily to go to work short tripping it (today work spot is 9kms,but for most years was 4kms)...since 2009.So everyday "the little engine that could" is seeing 6000-8000rpm with cold oil temperatures (10W40 viscocity is all I ever used) for 70.000km and still going strong,with zero oil consumption (every 6000km OCI) and a nice UOA I did last year for the first time.So your redline rpms is my everyday midrange rpms when cold with no issues.I would keep rpms no lower than 2000rpm and no higher than 3500-4000rpm and call it a closed case.
I think this all relative. As a percentage of your usable rpm range, you are really not revving that much higher than a typical car engine. I have a little 250cc Suzuki, which is similar, and it has a red line of just under 10k rpm from what I have read (no tach on the bike). I would correlate 5000rpm on the bike to about 3200 or 3300 rpm in my car, or half of red line rpm.
Also, props to you if your riding that thing in sub freezing temperatures!! I have ridden in weather as cold as about 45 degrees F and that was plenty cold for me. I actually tried to start it one morning after sitting in my shed overnight on a single digit temperature night, as it was blocking my snow blower and I figured it wouldn't hurt it to run it for a while, and it wouldn't even turn over fast enough to start. That was with Valvoline 20w50 motorcycle oil.