Has anyone used a bigger engine?

Has anyone done a build with one of these Honda gx100's or some of the bigger displacement four strokes? It looks plausible given this Honda 100 only weighs 23 pounds.

Hi John, well that engine is oversize, overweight, and low revving.......not to mention not legal as Moped, nor Motorized bicycle anywhere in the country that I am aware of.

So, let me just ask, what would be the advantage of using the GX100? I have not heard that they are sold cheaply either?

It certainly does not look narrow, and if you look at gx50 specs you'll see only .5 hp gain in the larger engine.

Wouldn't this lead us to believe that the gx50 is a "high performance" engine when its own brother is 2X displacement and only .5 hp increase? To be equivelent, the gx100 would need to make 4.2-5.0 hp!

What does everyone else think in this regard?

Mike

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well, thats true honda's are 'spensive and I found it odd that it only put out 3 hp. It would probably have torque coming out of its ears though.

You're right. I have a bike that uses the GX 100 clone. My Titan will out run it, but the Honda clone is great for pulling a trailer up hills. The biggest problem is running out of revs for top speed with reasonable gearing for take off. I can't complain though.....very dependable, and does a good job for me. Also, side by side, it doesn't look mych larger than the 50. I even had a couple of bike cops try it out. They weren't looking for speed, more quiet and tractability. They liked it.

i love my home built 148cc flathead bike

youtube link since i dont have time to resize my pictures

YouTube - ducatiluke's Channel

got 94km/hr it a modified briggs and stratton vertical shaft mower engine

According to this calculator your engine is making http://http://www.me.psu.edu/lamancusa/ProdDiss/Bicycle/bikecalc.htm about 5hp.

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Sweet conversion on the b&s from vert to horizontal!

GXH50

GX100

Looks to be a 33% increase from 2.1 HP (GXH 50) to 2.8 HP (GX 100) and continues to climb past 4000 rpms to around 3.2 Hp for a 50% gain and over twice the torque at nearly 4.5 ft-lbs compared to 2 ft-lbs w/ the 50.

Lower rpms give you more drive options too, especially if you are building your own!

The longevity on all of these motors is really good but I would think that the 100 would be less stressed from the loads and be incredibly long lasting.

I say go for it if your up to the challenge! Let me know if I can help and keep us posted if you do build one.

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http://www.youtube.com/watch?v=-kNGVCnjJVs

5hp from my flat head 148cc not supprised

ive opened up the intake tract

ive shaved off the decompressor on the camshaft

ive removed the governor

ive used a larger carby

stock standard they put out 3 1/2 hp at 3800 rpm and mine rev's much harder than this

thanks love that calculator

Armand

that is the engine i wanted to use on my bike ( project nuchenfuttz ) but they wanted a cool $500 bucks for it , i ended up using a 97cc 4 stroke from a baja dirtbug mini bike .

as for the hp difference between the gx100qa and the gxh50qa the 100 revs to 4000 rpm the 50 revs to 7000 rpm thats were the hp difference comes from .

what i like about the honda gx100qa is the engine dimensions and the fact that the intake and exhaust are on the front and back , and not at some weird angle .

i,m thinking of using the gxh50qa on my next project with belt drive and a torqueaverter .

i,m a 4 stroke diehard , when i do get a new engine i plan to experiment and try to convert my 97cc baja 4 stroke gasoline engine into a 95cc 4stroke diesel engine .

i imagine i will need to use larger head bolts to deal with the 20-1 compression ratio , but thats all part of the fun

my vid of my bike gives a good idea of the sound of a 4 stroke
YouTube - motorized west coast choppers bicycle

Awesome sound Dicman! And build

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CT laws pertaining to MBs have changed. Under 5 brake horse power and seat height of 26" or more and your legal.
http://www.ct.gov/dmv/cwp/view.asp?a=810&q=430480