I have NO idea how high this is revving...

GTLabs · 07-01-2009, 12:16 AM

Any guess on what kind of RPM I'm getting out of this 25cc 2-stroke Homelite? My guess is about 14k. It's got one of my biofuel blends on board. That's the only change. If you guys can also point out a good motorized bicycle kit, I'd really appreciate it

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**Tom S.** · 07-01-2009, 03:35 AM

Follow the links. I found several sites that mention typical speeds of appx 6,000 rpm. You think 14,000? That's awfully fast for just using different fuel. Is your blend oxygenated?

My Homelite 25cc conversion - RC Groups

Homelite Super XL 925 Chainsaw - Motorized Bicycle Engine Kit Forum

GTLabs · 07-01-2009, 02:42 PM

It's VERY oxygenated. 70% Butanol alcohol, 30% Omega glow fuel w/Nitro. There's no gas in it at all. Redline from factory is listed as 9k rpm.

I have a multi-meter w/ tach. Will that tell me anything? I seriously want to know how high this thing is spinning.

**minidragbike** · 07-01-2009, 02:46 PM

It's possible
It seems the smaller the motor the higher it revs. I have seen small 4 stroke motors rev that high with a lot of mods done. A small 2 stroke can get crazy.

65ShelbyClone · 07-02-2009, 02:41 AM

I would guess 8,000-10,000. From what I have read, even the heavily built 25cc Homelite/Zenoah engines top out around 14,000.

GTLabs · 07-03-2009, 12:55 AM

Tiny tachs top out at 9990. I think a local kart shop would be able to help me out with a tach signal.

I really expected this thing to be a "splattering motor on a stick". It didn't go aaaaaAAAAGH-*SPLAT!* I revved it like that for a good hour or so cycling it up and down and letting it idle and fiddling with the mixture a bit. It ran normal, but "not" LOL.

ATKRIDER · 07-10-2009, 03:19 PM

I say 10,000. I build / repair chain and demo saws and have seen 16,000 out of a german 70cc 2-stroker but wouldn't dare try and keep one there for any length of time. Besides that I believe that thing is spinning on all of ONE (1) crankshaft bearing so it isn't long for this world anyway.