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Old 08-22-2018, 08:58 AM
zoot zoot is offline
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Default Monkey Bike 212cc Project

The image provided isn't mine
I have a 50cc Road Legal Registered Monkey Bike (It's a Honda z50)
I am wondering if you've done much with these in the states? I am interested in picking up a 212 predator and messing around with it for daily use (no more than 5 miles). Would one fit? I can't find dimensions any where.
I know that you can replace with a bigger engine that comes in them from factory on some models however it's a lot more expensive and engines are harder to come by where as the 212 is cheap enough to throw out when it goes bang
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Old 08-22-2018, 09:08 AM
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there are chinese bolt on versions of that engine that will require zero modifications and dont even think about putting a predator 212 on there in my opinion.
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Old 08-22-2018, 09:18 AM
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Those minibike motors hang in the frame, rather than sitting on top like an industrial engine. Not worth considering IMO. As KartFab suggests, scale up to a 110cc or 125cc motor.
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Old 08-22-2018, 09:37 AM
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Has anyone got any specific engines and costings? Would like something with a good after market scene as can't live with standard. Everyone loves a good old tinkle on an engine

EDIT:
lifan 140 is a straight swap out apparently, anyone had any experience with one? Heard Lifan are cheap and unreliable

Last edited by zoot; 08-22-2018 at 09:46 AM. Reason: avoiding spamming
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Old 08-22-2018, 09:46 AM
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Save a little more money and get a direct replacement. I have a Z50, and a couple of CT70's, and I would NEVER think about putting in a industrial engine. It would be a step backwards in my opinion. Plus the value of your bike would drop.
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Old 08-22-2018, 10:26 AM
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Quote:
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Save a little more money and get a direct replacement. I have a Z50, and a couple of CT70's, and I would NEVER think about putting in a industrial engine. It would be a step backwards in my opinion. Plus the value of your bike would drop.
Would you ever consider the 140 lifan or even a 170? seen some with 200's in but no idea on how sketchy this would be at speeds
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Old 08-22-2018, 11:01 AM
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I would consider the Lifan 125 on my CT70s. I see good reviews on them. One Ct70 has a Lifan 70cc and the other has the stock Honda 70cc. My Z50r is so small, I'm not sure how comfortable I would be on it with a 125cc. Other, more experienced people do it no problem, but I like to ease my way into things. What is wrong with your engine?
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Old 08-22-2018, 11:16 AM
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Howabout posting a pic of what you actually have....
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Old 08-22-2018, 11:21 AM
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Quote:
Originally Posted by zoot View Post
Has anyone got any specific engines and costings? Would like something with a good after market scene as can't live with standard. Everyone loves a good old tinkle on an engine

EDIT:
lifan 140 is a straight swap out apparently, anyone had any experience with one? Heard Lifan are cheap and unreliable
lifans are inexpensive AND reliable. One of the best of the inexpesive copies of the real hondas.
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Old 08-22-2018, 11:21 AM
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Quote:
Originally Posted by Texan View Post
I would consider the Lifan 125 on my CT70s. I see good reviews on them. One Ct70 has a Lifan 70cc and the other has the stock Honda 70cc. My Z50r is so small, I'm not sure how comfortable I would be on it with a 125cc. Other, more experienced people do it no problem, but I like to ease my way into things. What is wrong with your engine?
The engine has done over 20k miles and need something with more poke, it's probably been sat for 3 years now. Want to stop using my car for daily commuting and something to give a good bashing around some b roads (some amazing quiet country roads in my area). A few mates have msx125's with big bore kits on. I'd want to keep up when we go for a blast. I would like to be able to cruise at 50-60mph
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Old 08-22-2018, 11:44 AM
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Quote:
Originally Posted by zoot View Post
Everyone loves a good old tinkle on an engine
Only if it's running too hot.

Planet Minis is another site to look at. Seems to deal mostly with small Hondas and their copies.
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Old 08-22-2018, 12:23 PM
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Lilhonda.com is another good site with plenty of engine swap info. For example https://lilhonda.com/index.php?threa...-k3-1972.9825/
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Old 08-23-2018, 09:10 AM
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https://tboltusa.com/store/engines-a...-114_1034.html
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Old 08-23-2018, 12:43 PM
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I still want one of these 125cc Black Ape Mini's
http://www.joyridemotors.com/city/mo...mini-bike.html
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Old 09-19-2018, 10:42 PM
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A 60 mph Monkey is a handful. That said, a 60 mph cruising speed will cost you.

IMO the Piranha 140 is kind of the benchmark for big block Chinese performance and reliability. It doesn't spin that fast but has tons of torque. Once running with an aftermarket exhaust it should do about 60 mph but it has no lighting or charging coil so you'll need to change out the stator, add a CDI harness and a wider footrest assy. If you add a VM26, hot cam, cam sprocket and valve springs and you'll probably hit 70 and cruise at 60. Cost: $700-900 all in.

If you put 20k miles on a Monkey, you must have friends who are into this stuff so if you're clever, patient and a fair negotiator you can save a lot of money here and there.

You can also touch 60mph on a well built original Honda motor with a $400 88cc big bore kit but the bike would prefer cruising at 45-50. That is my go-to motor for commuting.

Not fast enough? Build a 106 or 117cc stroker for ~$1000-1200 and you can cruise at 60 and loft the front wheel in 3rd gear but don't expect longevity.

If you want longevity and 60+ cruising you can do a stock Honda Nice motor. it was a Thai built model for SE Asia and you should be able to get a rebuilt motor for about $1000 that may last for >10k miles.
if you really ride thousands of miles a year, I would consider that the smartest way to go. as someone else mentioned, check out lilhonda and planetminis or ask Vince at T-bolt if you're in the US.
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Old 12-03-2018, 06:37 AM
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I have a similar bike like yours zoot.
I have a 125 loncin 4 speed in it.
With 8” tires and 17/29 gearing I can top out at 65mph in perfect conditions and tucking.
I think the 17/29 is too much gearing as 4th gear doesn’t pull much, more like over drive.
Lifan is a pretty reliable engine over all.
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Old 12-04-2018, 03:24 PM
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Go with the lifan 125 (can be had for under 300$ shipped) or if you really want to get crazy the Pirahana or GPX140. More then that I would recommend upgrading suspension, longer swing arm, and running 10" tires. After rebuilding the top end and cleaning up the ports etc I am able to top out at 36mph with the stock 49cc engine. I weigh 220lbs.
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Old 12-04-2018, 05:03 PM
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Aftermarket motors have there issues, but they seem to work.


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