Rear Sprocket for HF Predator 99cc

GoldenMotor.com
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BeaverRat

New Member
Jun 27, 2011
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WA
Hello,
I was just wondering what a proper sized (toothed) rear sprocket would be for use with the Harbor Freight 99cc Predator Engine, while using the jackshaft assembly from AGK. I did remove the governor, so the RPM's will be able to go higher than stock.

affordablegokarts: Jackshaft Assembly for 79cc HF Engine

I want it to be able to cruise at around 30 mph while not revving extremely high (as to prolong the life of the engine), and it must be able to haul a 185 lb rider up decently steep hills.

Thanks
 
scotto-

scotto-

Custom 4-Stroke Bike Builder
Jun 3, 2010
6,505
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38
Ridin' inSane Diego, CA.
You might want to start with a 50t rear sprocket and fine tune it from there. I doubt you'll run smaller than a 50t.....prolly between 50-60t should do ya fine.

dnut
 
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BeaverRat

New Member
Jun 27, 2011
147
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0
WA
Ok, im thinking a 56 tooth will be perfect. Is there any way to get a manic mechanic setup with a 56 tooth?
 
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tn97kouki

New Member
Sep 17, 2011
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tn
With a 56 tooth you will get about 31 mph @ 5000 rpms . A 50 tooth would probably work a little better . With the 50 tooth you would get about 35 mph .
 
Ibedayank

Ibedayank

New Member
Oct 29, 2011
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Columbia Tennessee
with the gearing listed on the website is 22mph using a 56 tooth @3600
..................................................... 31.1...............................5000

change 9tooth to 10 24.9 mph...3600rpm
.......................... 34.5 .........5000
change 9tooth to 11 27.3..........3600
.......................... 38.............5000
change 9tooth to 12 29.8..........3600
.......................... 41.4..........5000
change 9tooth to 13 32.3..........3600
............................ 44.9...........5000


hope this helps ya
 
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