bakaneko
Well-Known Member
Hello. I just finished and road 10 miles on my new 4-stroke 49cc HuaSheng bike from GasBike.net. I will comment on GasBike in the vendor thread but overall I am satisfied with the quality of the kit. This thread is to talk about my impressions of my 4-stroke and comparisons with my 2-stroke. I know there are few new folks in here looking at the 4-stroke.
Overall, I am impressed and KCVale was right about the vibration difference. I felt hardly any vibrations what so ever compared to my 2-stroke. I installed the engine on a $50 walmart mountain bike (yes, $50). I think it will be okay with the low priced walmart bike because I am not going to jump a hill and there is hardly any vibrations with the 4-stroke. If this walmart bike has my 2-stroke installed on it, I'm sure I will shake the bike apart. Also, because it is a mountain bike I had to remove the carburetor cover and muffler cover, and even then I have a maybe 5 degree imperfect tilt, which I compensate by having a slacker chain. I do not recommend going with a mountain bike or smaller bike (didn't fit BikeBerry's 4-stroke size guide); it is a hassle to mount in a small frame. I might go duo tensioners in the future to compensate more and have a tighter chain but for now it is okay. The only other thing I modified was going with longer mounting bolts to compensate for the mountain bike's large bottom tube and cutting the oil cap to a nub to pass the seat post tube. For the nuts, I double nutted the mounting bolts and surprisingly the rag joint came with friction nuts so no need to double nut those. All the bolts came with either friction nuts or a lock washer.
A few items to work on. As with many folks with new builds, I need to work out the jetting for the carb. I pulled the 36T speed sprocket from my 2-stroke (to replace 44T) and with the low 1-3 transmission (I believe) so I expected lower torque and higher top speed, which is fine for me since I am a lighter rider and need to workout. In the beginning there was hardly any torque but then as I rode more and stopped it and started it again. The engine developed more torque. The engine is also having trouble idling, which I will need to work on jetting and getting a better spark plug in there. I didn't install the wider crank since there is enough clearance for me to pedal if I lean forward. However, I will put in a longer pedal to help. I also let it idle 10 mins or so before I rode on it. I also need to put a cover or make a new carb cover. Speaking of which, the 4-stroke forum stickies seem pretty bare compared to the 2-strokes stickies for carb, engine, installation problems. I can try to start one but would love help from more seasoned 4-stroke guys like KCVale and etc.
Well that's it. Sorry for the ramblings. Overall, the 4-stroke engine is a blast. I need to work out the jetting and idling issues to improve performance but with time. I love the low to zero vibrations on it. And, with my gearing I cant tell the engine load and rpms... Here are some pictures and link to the kit that I got from GasBike.
http://www.gasbike.net/collections/...-drive-kit-with-huasheng-49cc-4-stroke-engine
Overall, I am impressed and KCVale was right about the vibration difference. I felt hardly any vibrations what so ever compared to my 2-stroke. I installed the engine on a $50 walmart mountain bike (yes, $50). I think it will be okay with the low priced walmart bike because I am not going to jump a hill and there is hardly any vibrations with the 4-stroke. If this walmart bike has my 2-stroke installed on it, I'm sure I will shake the bike apart. Also, because it is a mountain bike I had to remove the carburetor cover and muffler cover, and even then I have a maybe 5 degree imperfect tilt, which I compensate by having a slacker chain. I do not recommend going with a mountain bike or smaller bike (didn't fit BikeBerry's 4-stroke size guide); it is a hassle to mount in a small frame. I might go duo tensioners in the future to compensate more and have a tighter chain but for now it is okay. The only other thing I modified was going with longer mounting bolts to compensate for the mountain bike's large bottom tube and cutting the oil cap to a nub to pass the seat post tube. For the nuts, I double nutted the mounting bolts and surprisingly the rag joint came with friction nuts so no need to double nut those. All the bolts came with either friction nuts or a lock washer.
A few items to work on. As with many folks with new builds, I need to work out the jetting for the carb. I pulled the 36T speed sprocket from my 2-stroke (to replace 44T) and with the low 1-3 transmission (I believe) so I expected lower torque and higher top speed, which is fine for me since I am a lighter rider and need to workout. In the beginning there was hardly any torque but then as I rode more and stopped it and started it again. The engine developed more torque. The engine is also having trouble idling, which I will need to work on jetting and getting a better spark plug in there. I didn't install the wider crank since there is enough clearance for me to pedal if I lean forward. However, I will put in a longer pedal to help. I also let it idle 10 mins or so before I rode on it. I also need to put a cover or make a new carb cover. Speaking of which, the 4-stroke forum stickies seem pretty bare compared to the 2-strokes stickies for carb, engine, installation problems. I can try to start one but would love help from more seasoned 4-stroke guys like KCVale and etc.
Well that's it. Sorry for the ramblings. Overall, the 4-stroke engine is a blast. I need to work out the jetting and idling issues to improve performance but with time. I love the low to zero vibrations on it. And, with my gearing I cant tell the engine load and rpms... Here are some pictures and link to the kit that I got from GasBike.
http://www.gasbike.net/collections/...-drive-kit-with-huasheng-49cc-4-stroke-engine
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