25H chain strength

[JanOdab]

Hi, is 25H chain strong enough for motorized bike?

Because of DIYing it is quite difficult for me to make all parts from 415 chain system to fit my bike.

I am planning to use:

Honda GX50
4 stroke
50ccm
2.0 hp - 7,000 rpm [1.47 kW]
torque 1.6 lb-ft - 5000 rpm [2.2 Nm]

26" city bike
gear ratio motor:rear sprocket 10t:56t
chain D.I.D. 25H - tensile strength 1,322 lbf [600 kgf]

total weight (me+bike+load) cca 220 lbs [100 kg]

second question - is gear ratio ok? I am more focused on torque than speed. Max speed I need is cca 20 mph [30 kmh] but I want to be able to climg steep hills.

Thanks for your inputs!

 

[Mossy]

I like the 79cc predator for the parts available for it.. more options for upgrades

 

[Mossy]

Post photos of the build and people will help

 

[Venice Motor Bikes]

Hi, is 25H chain strong enough for motorized bike?

Because of DIYing it is quite difficult for me to make all parts from 415 chain system to fit my bike.

I am planning to use:

Honda GX50
4 stroke
50ccm
2.0 hp - 7,000 rpm [1.47 kW]
torque 1.6 lb-ft - 5000 rpm [2.2 Nm]

26" city bike
gear ratio motor:rear sprocket 10t:56t
chain D.I.D. 25H - tensile strength 1,322 lbf [600 kgf]

total weight (me+bike+load) cca 220 lbs [100 kg]

second question - is gear ratio ok? I am more focused on torque than speed. Max speed I need is cca 20 mph [30 kmh] but I want to be able to climg steep hills.

Thanks for your inputs!

That 25H chain should be OK... 50cc 4-stroke engines aren't known to be torque monsters.

As far as gear ratios go... you should consider a using gear reduction box like the factory 49cc 4-stroke kits have!!
If you're determined on making it all yourself, you can at least copy the gear ratios of one of those kits.

 

[Mossy]

2.0 HP @ 7000rpm pulling 220# up a hill... The chain and gears will use most of if not all of the power... If you had 6-7hp 2-3 would get to the ground and still wouldn't like hills