New 4-stroke 49cc HuaSheng (142F) Build

i never did any real mods to mine.



never had issues with hauling up hills, at about 50km/h...never pedaled much, either. never changed the plug from memory. did die from a strange carbon deposit in the cylinder/exhaust valve in the end...
 
i never did any real mods to mine.



never had issues with hauling up hills, at about 50km/h...never pedaled much, either. never changed the plug from memory. did die from a strange carbon deposit in the cylinder/exhaust valve in the end...


Hmm, maybe I screwed up or it still needs break in and tuning. What transmission and wheel sprocket were you running, headsmess? I think I was over ambitious with my gearing, I'm at 1:3 to 36T sprocket. If you could can you take a look at the video above in my prior post and let me know what you think about the power level of that HuaSheng build compared to stock? I think this guy has about $100 in upgrades; and I am not sure about his transmission and sprocket. Thanks.
 
Not to spam too much, but I am going to continue to post my adjustments and upgrades to the base, cheapest 49cc 4-stroke HuaSheng build ($199).

Any comments from 4-stroke owners would be appreciated as I get this girl up to her potential.
Cool, you made a 4-stroke and got it go for a record low price!
Now you'll have some experience with them to build you next new one as that won't last long no matter how much more money you throw at it.

Nothing like first hand knowledge of why good parts make a difference bakaneko, you will get to experience all of things that will start failing with a $50 toy bike and $30 drive train.
A valuable lesson for when you want to build something reliable but not that costly a lesson for $200.

Ride safe and check it often bud.
 
couldnt say what transmission i used, it was a homebuilt chain double reduction, i think it was around 14:1 in total, for 26" wheels. still have half of it attached to a frame somewhere.

the "maxtorque" clutch i had lying around was pretty lousy, i vaguely recall modifying a chainsaw clutch after a while... quite some time now, since that thing was in use.


KC is right, you gotta spend money...but dont spend it on what you got! i spent money on a lathe, tools, sprockets and bearings etc... others choose to spend it on good kits n bikes. even a few thousand sounds like good value when something goes wrong and you are lying in a hospital bed...

use the 44t. the kit my engine originally arrived with had a 55T! it was the cheapest way to get the engine, getting someone elses unused low-grade kit....$50 :)
 
couldnt say what transmission i used, it was a homebuilt chain double reduction, i think it was around 14:1 in total, for 26" wheels. still have half of it attached to a frame somewhere.

KC is right, you gotta spend money...but dont spend it on what you got!
i spent money on a lathe, tools, sprockets and bearings etc...
others choose to spend it on good kits n bikes.
even a few thousand sounds like good value when something goes wrong and you are lying in a hospital bed...

And that is just the $ to fix your battered body..
The original pain and scars however stick around forever, and you still have a broken POS bike.

The bottom line here is just build a safe machine to start with and yours is not one is all, not with those parts.
I'm just trying to save you from some anguish is all as I have felt it, and I see it coming your way with that build.

Just a warning, take it or leave.
 
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I got it on sale for $50. Now, we know that it has been up to $125. It isn't a based price of $50... And, yes, I rode on worse at fast speeds. Thus far, the bike has been handling itself well. I had to stop from 23mph to 0mph today and it did it within 10 feet with both brakes. I went up to 35mph and it performed well no vibrations or iffy wobbling. My only complaint for a sale price bike at $50 is that the seat cushion is like a rock and it is suppose to be one of those comfy styles...
 
I forgot to mention the seat. it also was replaced. I am planing to use it on my next bike. Sooner or later, things will start to happen.... But if you need extra parts, please let me know after I am done with my next MB

If you check the wheels you will see that they are not perfectly tru,,,,thats because they are put together with a machine........ Just my experience and everyone else's thoughts. That bike is not a good bike. If you look at craigslist you can see good quality bikes there all day long, that are moderately priced.
 
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I forgot to mention the seat. it also was replaced. I am planing to use it on my next bike. Sooner or later, things will start to happen.... But if you need extra parts, please let me know after I am done with my next MB

If you check the wheels you will see that they are not perfectly tru,,,,thats because they are put together with a machine........ Just my experience and everyone else's thoughts. That bike is not a good bike. If you look at craigslist you can see good quality bikes there all day long, that are moderately priced.

Thanks for the reach out John. I will keep an eye out for her (80 miles thus far). I had to adjust the handle bar alignment right when I got the bike and realign the rear brakes after inflating the tire to the proper psi.
 
So, listed below is what I've done from stock thus far and the next upgrade.

Changes from stock engine / settings
- Adjusted the idle and mixture screw to improve performance and idle
- NGK 7544 Iridium IX CR7HIX spark plug provided more torque and mid range speed via better ignition. It feels like 3-5mph more speed for optimal torque and ~3-5 mid range speed improvements. I love this small upgrade ($10) and I think it is on sale at sickbikeparts for $7 atm. Idling has improve too

Upcoming Changes
- One of the centripetal springs broke (not sure how for new engine) and chewed up some of my clutch pads. Ordered a replacement so this should provide even more power than I am seeing now
- I might eventually pull the 36T sprocket and put in the stock 44T. I am a lighter rider but the torque is so low. I will see
- Might get a performance exhaust or just regular 2-stroke exhaust for better air flow

Any comments from 4-stroke owners would be appreciated as I get this girl up to her potential.
 
- NGK 7544 Iridium IX CR7HIX spark plug provided more torque and mid range speed via better ignition. It feels like 3-5mph more speed for optimal torque and ~3-5 mid range speed improvements. I love this small upgrade ($10) and I think it is on sale at sickbikeparts for $7 atm. Idling has improve too
Yep, I use that plug in every 4-stroke build, they make a difference you can feel.
- Might get a performance exhaust or just regular 2-stroke exhaust for better air flow
Any comments from 4-stroke owners would be appreciated as I get this girl up to her potential.
Anything is better than the stock can exhaust but there is no 'performance' exhaust on a 4-stroke engine like a 2-stroke engine. All you can do is make it as free flowing as possible.
 
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