79CC HF motor and crank size

G

gokart25

Member
I was in Harbor Freight today and they had a 79cc 4 stroke motor on display.
I like the size of it, but the output on the crank is not the normal 5/8'', it's smaller.
What are people doing here with the small output shaft?
Do you have to run a transmission, or can you just get a gokart clutch to fit?
Any picture of what people have done would be great.
Thanks
 
hmmm, this is cut n pasted from this page
http://www.harborfreight.com/79-cc-ohv-horizontal-shaft-gas-engine-69733.html

Displacement: 79 cc
Engine cycle: 4 stroke
Compression ratio: 8.5:1
Shaft size: 5/8" (16mm) diameter x 2.4" (60.1mm) L, end tapped 5/16-24 with 3/16" keyway
Fuel capacity: 0.53 gallon (2 liter)
Height: 11-3/4"
Width: 12-1/4" (from end of crank to starter recoil)
Width: 11-1/2" (from air filter to fuel tank)
Mounting base pattern: 102mm L x 104mm W - 61.5mm W (4" L x 4.9" W - 2.4" W )
Shipping Weight: 26.65 lb.
 
Ok, I'm a little mixed up here..
I was thinking about go kart clutches that fit 3/4" shaft, and when I saw that the shaft on the 79cc motor was smaller than I was used to seeing, I wondered how and what fits the 5/8" shaft.
I take that the pulley on the EZM fits 5/8'' and would bolt right onto the 79cc?

What are people doing here with the small output shaft?
Do you have to run a transmission, or can you just get a gokart clutch to fit?
Any picture of what people have done would be great.

I would really like to try a 4 stroke motor, if I could get it to fit..
Thanks
 
the EZM bolts right up and there is a version geared specifically for the HF ;)
I have 5500+miles on my 99cc engine and drive :)
 
My suggestion, if you need to use a 3/4" to 5/8" adapter on a 79cc engine, you are probably using the wrong clutch. EZM or a AGK 5/8" clutch are 2 options that you have with the 5/8" shaft.

Good Luck,

Chris
AKA: BigBlue
 
Be careful, 5/8" is not 16mm. My 99cc pred had a 16mm shaft and I had to ream out the clutch to fit. I've read some people using sand paper on the shaft to make it smaller too. Just be aware of this and save yourself the confusion.
 
MaxPower said:
Be careful, 5/8" is not 16mm. My 99cc pred had a 16mm shaft and I had to ream out the clutch to fit. I've read some people using sand paper on the shaft to make it smaller too. Just be aware of this and save yourself the confusion.
Click to expand...

I thought the 16mm thing was a manufacturing "glitch" that only occurred with the 99cc model, later to be "fixed" before they stopped building the 99cc? I have the older Greyhound model 79cc and the 5/8" MaxTorque clutch is a perfect fit.
 
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