Predator 79cc okay for a 20-25 mile trip twice a week?

volcarius

volcarius

New Member
saw somewhere else that it can overheat but i'm kinda of already committed to this engine as it's already ordered. i plan to ride about 23 miles and back to my girlfriends house once a week so <45 miles? round trip. would this engine be okay for this application? the way there also has several hills some are quite steep but others are more tame. if it is going to overheat, are there changes i can make to prevent overheating or make is overheat less? also would the huasheng be better for this? i'm already committed to the predator but id like to know anyways
 
Dude, you want to court (date) a young lady? A motorized bicycle is not going to win the fair damsel. Where as a real motorcycle or nice car/truck.
The lady I swept off her feet, liked my Jeep and BMW motorcycle.
Tom
 
Tom from Rubicon said:
Dude, you want to court (date) a young lady? A motorized bicycle is not going to win the fair damsel. Where as a real motorcycle or nice car/truck.
The lady I swept off her feet, liked my Jeep and BMW motorcycle.
Tom
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For several years a motorized bicycle was all I had. I've lost count of the many dates I got from women coming up to me asking questions about it.
 
volcarius said:
saw somewhere else that it can overheat but i'm kinda of already committed to this engine as it's already ordered. i plan to ride about 23 miles and back to my girlfriends house once a week so <45 miles? round trip. would this engine be okay for this application? the way there also has several hills some are quite steep but others are more tame. if it is going to overheat, are there changes i can make to prevent overheating or make is overheat less? also would the huasheng be better for this? i'm already committed to the predator but id like to know anyways
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For what you're wanting to build, here's what you need: engine-->cvt-->left side double sprocket jackshaft-->rear sprocket. I can tell you what sprockets to use by what size diameter tires you're using. Around 30 mph is a realistic goal with this engine.
 
Sidewinder Jerry said:
For what you're wanting to build, here's what you need: engine-->cvt-->left side double sprocket jackshaft-->rear sprocket. I can tell you what sprockets to use by what size diameter tires you're using. Around 30 mph is a realistic goal with this engine.
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Do i need the jackshaft? I thought the CVT would give enough torque
 
volcarius said:
.Do i need the jackshaft? I thought the CVT would give enough torque
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What size wheels are you using? You're going to need a total reduction of 9.38\1 for 26" wheels to do 30 mph. This calculation will have your 3\1 cvt giving you a reduction range of 28.14\1~9.38\1. This'll give you hill climbing abilities. The bike is set up to where at full throttle it won't go any faster than 30 mph on level ground with no tail wind. This calculations is predominantly for a stock engine.

The purpose of the jackshaft is to provide another reduction point. In oder to use the full range of the cvt. Without the extra reduction point, the sprockets would be like a 94t\10t. If you used something smaller it'd be like having a 2\1 cvt instead of a 3\1.

The next objective will be to mod the engine for reliability.
 
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Sidewinder Jerry said:
What size wheels are you using? You're going to need a total reduction of 9.38\1 for 26" wheels to do 30 mph. This calculation will have your 3\1 cvt giving you a reduction range of 28.14\1~9.38\1. This'll give you hill climbing abilities. The bike is set up to where at full throttle it won't go any faster than 30 mph on level ground with no tail wind. This calculations is predominantly for a stock engine.

The purpose of the jackshaft is to provide another reduction point. In oder to use the full range of the cvt. Without the extra reduction point, the sprockets would be like a 94t\10t. If you used something smaller it'd be like having a 2\1 cvt instead of a 3\1.

The next objective will be to mod the engine for reliability.
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ohhh okay. wheels i think im going with are 26"
 
Sidewinder Jerry said:
What size wheels are you using? You're going to need a total reduction of 9.38\1 for 26" wheels to do 30 mph. This calculation will have your 3\1 cvt giving you a reduction range of 28.14\1~9.38\1. This'll give you hill climbing abilities. The bike is set up to where at full throttle it won't go any faster than 30 mph on level ground with no tail wind. This calculations is predominantly for a stock engine.

The purpose of the jackshaft is to provide another reduction point. In oder to use the full range of the cvt. Without the extra reduction point, the sprockets would be like a 94t\10t. If you used something smaller it'd be like having a 2\1 cvt instead of a 3\1.

The next objective will be to mod the engine for reliability.
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should i get the grubee cvt with the freewheel or should i get the freewheel separately?
 
Sidewinder Jerry said:
I'd get this jackshaft. Get 44t rear freewheel hub sprocket, a 36t jackshaft sprocket and a 17t jackshaft sprocket. Run a 10t on the cvt.

Cvt 10t~36t jackshaft; jackshaft 17t~44t rear freewheel hub.


Thi
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also do i need the grubee wheel with the freewheel hub? bc i think i found a good set of wheels with 10g spokes. if i dont need it do i get a normal six hole one?
 
volcarius said:
also do i need the grubee wheel with the freewheel hub? bc i think i found a good set of wheels with 10g spokes. if i dont need it do i get a normal six hole one?
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There's several options for the gearing sprockets. The main reason I suggested having the freewheel at the wheel hub is the wheel will be the only thing moving when coasting. Neither chain will be moving.

The next option would be to use a freewheel on the jackshaft. Then the chain between the rear wheel and jackshaft will be moving while coasting. While the chain between the engine and jackshaft won't be moving. The less moving parts while coasting the lower the drag on the drive system.

If you put the freewheel on the cvt then both chains will be moving while coasting.
 
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