Running full blast

Actually, I run my Homelite weedwacker at a speed just off-idle. I've run it this way for the last 8 years without so much as a plug change or de-carbonizing.

I run Sea Foam through it once or twice a year.

I run my chainsaw(s) about half to three quarters throttle 90% of the time and one is over 10 years old.

Run your bicycle motor the way you feel comfortable. They will either blow or run forever.

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If it ain't broke, and you mess with it long enough, it will be.

Bikejoe,
I disagree with your logic mainly because every doubling of engine speed causes increased frictional forces by 4 (friction is exponential). If friction is main cause of engine longevity than decreasing engine speed by 25% would mean a greater than 25% increase in longevity.

I think you are correct sir!

If I am correct, then it would be a good thing, if you are correct, then it would be a GREAT thing.

Like my weedwacker and chainsaw, by your reasoning, an engine run at lower speeds should last nearly forever.

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If it ain't broke, and you mess with it long enough, it will be.

What say you to that?

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If it ain't broke, and you mess with it long enough, it will be.

Yes, that's pretty much true. In many 3rd world countries in remote villages, the villages use Lister diesel generators. The generator runs at a constant 600 rpm and these generators have been known to last 40+ years without overhaul and shutdown only for oil changes and other maintenance.

I don't know if this has been answered before or not but does anyone know the rpm output of these engines at full throttle.

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Info could be as accurate as the term 80cc but 2.4 horse at 4000rpm and they rev out at 6000 to 7000. If you were at 4000 rpm you would be getting the full power band as it would tend to mellow out after that. (At least on a Dyno, on paper )

thanks that helps me a lot. I had a little bit of fear about trying to put a friction drive on one but that is pretty close to an electric motor I have used a friction drive on so it should be okay.

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visit my blog for Riding in the hood,... The home brew bike journal....http://frictiondrivebicycles.blogspot.com/ The deacon's fiction (new installment daily).... http://chinesekitmotorbike.blogspot.com/

http://freekibble.com feed the homeless dogs

I think the manufacture states 6300 as "redline"- to be taken with a grain of salt.

I know a lot of folks say that 35mph is about tops with a 44T, I have run one of my bikes up to 43-5 with a 44T with two different cars used as "pace cars". The engine is still running.

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If it ain't broke, and you mess with it long enough, it will be.

Maybe I will slow it down a bit.