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4 Stroke Bicycle Engines & Kits 4 stroke engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine

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  #1  
Old 01-01-2017, 09:31 PM
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classicjondo classicjondo is offline
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Location: Puyallup, WA
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Arrow I'm only getting 25mph with the 32 tooth sprocket?!?

Hi all, I've had my Huasheng 4-stroke bike for a while now, and I use the 32-tooth sprocket with it. It gave me about a 5mph boost over the stock one, but I see people on here and YouTube boasting about their 30-40mph bikes?? How does a guy go about getting that kind of speed from the 4-stroke? I looked into a shifter kit but it's just too expensive for me to justify getting it. So what do you guys recommend for aftermarket parts to get me going faster? Thanks a ton!
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Old 01-02-2017, 12:02 AM
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ultralight01 ultralight01 is online now
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Default Re: I'm only getting 25mph with the 32 tooth sprocket?!?

Jackshaft kit. You can upgrade parts but it won't gain you much more speed. Either custom build a 4 stroke bike with a predator that can go 40mph or stick to 30 max without a jackshaft system.
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Old 01-02-2017, 12:38 AM
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classicjondo classicjondo is offline
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Default Re: I'm only getting 25mph with the 32 tooth sprocket?!?

Ugh, that's what I thought. Is this the jackshaft kit I need? I have the 5G dual-chain gearbox: http://www.sickbikeparts.com/catalog...roducts_id=110
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Old 01-02-2017, 10:22 AM
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Default Re: I'm only getting 25mph with the 32 tooth sprocket?!?

http://www.sickbikeparts.com/catalog...roducts_id=110
This is what you need, or build your own with pillow blocks and various parts. There's a member here who just lengthens the output shaft on the gearbox, which goes straight to the freewheel. However this kit should work quite well.
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Old 01-02-2017, 04:20 PM
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Greg58 Greg58 is offline
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Default Re: I'm only getting 25mph with the 32 tooth sprocket?!?

What was the stock sprocket size, 44 tooth? If so you may have went too far. The little engines need to run at a higher rpm to perform at their potential. A 36-40 might be a good compromise.
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