Quick Question on 30cc trimmer motor - Is it enough power?

motoringbike

Member
Jan 28, 2014
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Will a 30cc two stroke motor be enough power to move 425lbs (bike, cargo, me)
I was thinking chain drive.
The speed I wish to go would be 20mph which is 32kph.
 

crassius

Well-Known Member
Sep 30, 2012
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USA
few 80cc kits sold will move that much weight up any kind of hill unless a 48T or 56T rear sprocket is used

maybe if you found something like a 10horse 30cc racing trimmer it might
 

motoringbike

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Jan 28, 2014
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Thanks for the reply.

The route is fairly flat, Scottsman hill is the only real challenge on the long distance trip. Gosh its gotta be 2-3 miles (3-5km) and a grade of 2%. Its the kinda grade where semi trucks gear down and steadily make their way up in the left lane.

If I go with the smallest gear on the 30cc trimmer motor shaft then a huge tooth on the wheel, say #35 - 72T, or go jack shaft for higher gear ratio would be enough?

I double checked my speed requirements and 32kph(20mph) is about right for my needs.

If I buy the $20 trimmer 30cc, make it work, and its not powerful enough, then I hillbilly up a second $20 gas trimmer motor to get that extra bit of power.
 

Bishop

New Member
May 4, 2019
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You might try zenoah g43l from Staton. Friction drive though. But I don't know about 425lbs. I have one with an upraded carb and have been clocked at 40. Check it out on YouTube. search "friction drive motorized bicycle by Bishop". Best two stroke I have ever owned.
 

cannonball2

Well-Known Member
Oct 28, 2010
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Colonial Coast USA.
I have a 21cc Echo FD powered bike that easily moves 200+lbs of bike and rider at 20+mph. However I live in the coastal flats with no hills and that's about half the weight you want to move. Get something bigger.