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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 11-11-2016, 12:32 AM
bikeybikerton bikeybikerton is offline
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Location: hawaii
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Default Good Chinese 4 stroke or lemon?

Hello,
I'm new here. I bought a kent bayside. It looks good if you take all the stickers off. I am going to put a 4 stroke on it. I want to make these not only for myself, but sell them on the side. I found a wholesaler at alibaba.com .

I was wondering if anyone recognizes this 4 stroke kit and if it is any good:
https://besttouch.en.alibaba.com/pro...r_bicycle.html

I am planning on buying 5 to start out, but I don't want to buy any junk.
They sent me an updated photo of the kit that I attached here.
Could anyone tell me if its a good set up or a lemon?

Thank you!
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File Type: jpeg 49cc 4 stroke real photo.jpeg (468.0 KB, 16 views)
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  #2  
Old 11-11-2016, 12:46 AM
TheNecromancer13 TheNecromancer13 is offline
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Default Re: Good Chinese 4 stroke or lemon?

First off I notice on the alibaba page it says "two cycle 4 stroke motor". It can't be both. From looking at the engine it's a 4 cycle, but they include the standard 2 stroke kit exhaust pipe. It also has chineseium bolts which will shear off if you look at them wrong. Add to that the stock chinagirl chain tensioner, universally hated by all, and the stock sprocket adapter, which rips the spokes out of your wheel. Also that mounting plate looks like it will be very hit or miss as to whether it will actually fit any given bike frame. I am also unsure if it will mount onto the kent bayside
To sum it all up, I would say it's a piece of **** and I wouldn't put one on a bike if you paid me to do it. However, if you're willing to spend a few hundred dollars on upgrades for each bike, it could work.
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  #3  
Old 11-11-2016, 01:40 PM
bikeybikerton bikeybikerton is offline
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Default Re: Good Chinese 4 stroke or lemon?

Hi Necromancer13,
Thank you very much! That was a huge help. I
I'm glad you told these problems before I bought some and wasted my time and money! I found another one that seems different: https://www.alibaba.com/product-deta...838.0.0.qXLvgX
I couldn't copy the picture or I would have included it. Would you mind telling me if this kit is any better? I don't need top of the line stuff, but I don't want junk either.
I am also thinking about the bikeberry 4 stroke kits. Could you tell me how good those are?
They have a wholesaler program. But their's are not belt drive so they go 25 instead of 30 mph like the belt drive one's. But if they are better quality, then I would prefer those.
Thanks again for your expertise!

Last edited by bikeybikerton; 11-11-2016 at 01:52 PM.
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  #4  
Old 11-11-2016, 02:21 PM
TheNecromancer13 TheNecromancer13 is offline
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Default Re: Good Chinese 4 stroke or lemon?

The other alibaba ones look like it's just an engine without any of the components. I don't have any personal experience with bikeberry, but I've heard enough horror stories about them that I'd be wary if I were you.

The problem with kits is that about 90% of them are made with cheap chinese parts that break easily and don't work very well. There are a few sellers that have better quality kits, but I can't tell you with certainty which ones are which, because I have built exactly one bike from a kit, the first bike I ever built. Now I build them from scratch and get much better results. Here's an example (my current ride):


I have built a few others similar to this one (although not quite as nice) and sold them. They are a bit more expensive though. What is your budget?

If you do build from a kit, expect to have to upgrade at least a few of the major components if you want an engine that won't break down or wreck your bike.

How much are you thinking of spending on your bike btw?

Last edited by TheNecromancer13; 11-11-2016 at 02:24 PM.
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  #5  
Old 11-11-2016, 03:43 PM
bikeybikerton bikeybikerton is offline
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Default Re: Good Chinese 4 stroke or lemon?

Hello Necromancer13,
Nice bike! Thanks for the reply.
It is a complete kit on that last link: https://www.alibaba.com/product-deta...838.0.0.qXLvgX

The pictures of the parts are more than half way down. It looks like better components than that other alibaba link, but I'm not sure. Would you mind looking at it?

I'd be happy spending 300 for a really good engine kit just for myself, but I want to start a business and sell 4 stroke bikes. So I need to find cheaper engine kits but ones that are not junk.

Take Care,
Pete



I live in Hawaii and I think people would really want these here.
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  #6  
Old 11-12-2016, 01:11 AM
TheNecromancer13 TheNecromancer13 is offline
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Default Re: Good Chinese 4 stroke or lemon?

The components look exactly the same to me, but it is hard to tell because of the tiny picture. Judging by the unit price I'd say they are the same.

If your budget is $300 I'd suggest going with a 2 stroke kit. That way you will have enough money left after buying the kit to replace the sprocket adapter and upgrade the spark plug, spark plug boot, fuel line, and fuel filter, and throw away the petcock and replace it with a barbed brass nipple. Might even have enough left over to buy an expansion chamber pipe.

Unfortunately, $300 just isn't enough to get a good 4 stroke setup. If you're looking for a reference, expect to spend $400-600 for a 49cc 4 stroke setup. And if you want a bike like my red one, you're looking at about $1500 in parts, including the bike, although you could probably do it for a thousand if you forgo the disc brakes and front suspension (although I wouldn't recommend it). If you want to go above that after you've built a few bikes, I'm currently building a new bike that will cost about $3000, but it will have 4 speed transmission and engine powered headlights and go 60 mph. I think that would be overkill for a first build though.

I'm not normally one to advocate the use of 2 stroke bike engines, but for your budget it seems like a 2 stroke might be your best option.
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  #7  
Old 11-12-2016, 03:15 PM
bikeybikerton bikeybikerton is offline
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Default Re: Good Chinese 4 stroke or lemon?

Hi Necromancer13,
Thank you for your insight.
I meant to say "over $300". I've read the best 4 stroke kit is the grubee skyhawk 4g tbelt for 349$. But then I read this: "Good-bye to China/Grubee Junk, Hello To Reliable Motorized Bicycling!"

http://motoredbikes.com/threads/good...cycling.39154/

I like your bike, but I am trying to do the opposite of you. I want a very reliable form of transportation that is inexpensive, does not require constant tinkering, and is easy to put together. I want to sell these to people like me with no license that want a reliable inexpensive way to get around.

The opinion of the guy above says friction drives are the most reliable. But his system costs 700$. So I'm thinking my next step is to look for a friction drive system that is good but affordable. Any ideas would be appreciated.

Take Care,
Bikeybikerton
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  #8  
Old 11-12-2016, 10:38 PM
TheNecromancer13 TheNecromancer13 is offline
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Default Re: Good Chinese 4 stroke or lemon?

Friction drives are cheap, but do very poorly in wet weather and on hills. They also wear out tires very fast, and that can get expensive pretty quickly. If you want to build a cheap friction drive, get a weed whacker engine and fashion a mount for it to drive the rear wheel. If you want a reliable engine, you're going to have to spend a bit more. My first bike, a 2 stroke kit, was broken more often than not because I didn't spend the money to do it right. The bike in the picture I posted now has over 5,000 miles on it without any breakdowns other than a few flat tires. When it comes to inexpensive transportation, in the grand scheme of things $1500 isn't that much, especially when you consider that you get over 100 miles to the gallon, and I can say from experience that some people will pay more than that for a bike like mine. Some non-motorized bikes cost more than that these days.

I would not go with friction drive if I were you, as if I am not mistaken, it rains quite a bit in Hawaii
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  #9  
Old 11-13-2016, 01:35 PM
bikeybikerton bikeybikerton is offline
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Default Re: Good Chinese 4 stroke or lemon?

Hello Necromancer 13,
Yeah, its very wet here. I was then thinking of a rear chain drive but I cannot seem to find a kit. I heard DAX makes them but I don't see them on the website. I saw a rear belt drive kit yesterday but it was kind of pricey. I would like something with as little moving parts as possible so it is reliable and easy to put together. Your bikes are nice and could be resold too but I just don't want to have to put that much work into something for resale.

But then I read this post that says friction drives do work in the rain. It might just be because of his setup though:
http://motorbicycling.com/showthread.php?t=25770
" Hmmmm...is this fact or friction...can't drive in the rain....LOL?

I run 3 BMP friction drives with 3 Dax Super Titans. It rains about 60 inches a year here. Just got back from a 7 mile ride with my son in the rain. Bikes are covered with leaf litter and "slop". Neither of us had any slippage issues. PERIOD. This includes inclines of about 45 degrees that go for a city block. Slippage?....NOPE.

Now...I must admit before I tried friction drives and was running the "80" Skyhawks with chain drives I figured friction drives would slip in the rain.
However, when I built my first BMP kit with a 35cc Honda for my father in law, I figured I'd test it hard and see what they could do. Now the friction drive Honda 35 didn't have much horsepower behind it...but it ran so smooth, so quiet, so vibration free...compared to the chain drive skyhawks.....I figured....this has SERIOUS potential, it just needs MORE horsepower!

So......tried out a Super Titan. Initially, I figured 50 Honda...but there is no "easy" clutch method for them. So... figured...I'd try the Super Titan. WOW! No way I'm ever going back to 2 stroke happy time motors. Since then...purchased 2 more Super Titans for the other 2 bikes in the family motor pool.

Initially....I was very suspicious of 4 stroke vs 2 stroke...figured I'd lose power. Boy....was I wrong. The Super Titan flys up hills (1.25 BMP roller) where previously I'd be peddling my guts out with a 48 tooth rear sprocket and the big Skyhawks.

Tires....I'm running Surfas, City Drifters at 55 psi. They are spendy....but a top rate tire. Couldn't be more pleased with them in the rain. Traction is excellent, they do not slip on wet leaves, mud etc. They wear like iron. Only place I could find them was REI."

So....I'm going to have to say....myth busted. Friction drives work in the rain, just as well as in the dry. I only drive about 2,500 miles a season....but about 1/2 of that is in rain. "

Maybe its just his huge engine and the type of tires that makes it possible. I'm still thinking chain drive for simplicity and reliability. but still looking for a kit.
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  #10  
Old 11-13-2016, 02:44 PM
bikeybikerton bikeybikerton is offline
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Default Re: Good Chinese 4 stroke or lemon?

Hi Necromancer13,
I found this chain drive here:
http://motorbicycling.com/showthread.php?t=25770
(attached photo). Seems better for rain than friction drive, but still simple and reliable looking.
The link they gave doesn't work though. I cannot seem to find one like it anywhere.
Here's a belt drive one:
https://www.bikeengines.com/shop/4-s...-kit-32-spoke/
But its only 38cc and kind of pricey for putting on bikes and reselling.
Still trying to find the best kit for my purpose.

You might tired of this thread so far! But you've helped me a lot in trying to make my decision. Thanks.
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File Type: jpg chain drive kit.jpg (5.1 KB, 34 views)
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