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  #11  
Old 09-18-2016, 07:56 PM
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scratchbuilder scratchbuilder is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

If your cdi looks like this, I call it round body, you have rev limited cdi. A no limit cdi is a sguare body and the plug wire is on the opposite corner.
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  #12  
Old 09-20-2016, 03:23 PM
Greenbiker Greenbiker is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

The 4 strokes tend to be used with a 44 or larger sproket from my research. Im using a 44 on my set up and it has plenty of take off and acell with a reasonable top of about 27 mph last i checked. Its still newish and im heavy with a lot of edc gear (heavy chains and locks and tools and a pack with stuff. The take off is just a bit sluggish but with no bogginess, so i imagine if i went taller in sprocket i would get some bog on take off. Its about the perfect set up amd it came that way. I also use a hub adapter but that neither here nor there there for power or speed. Just convenience really.

Last edited by Greenbiker; 09-20-2016 at 03:26 PM. Reason: Stupid typos.
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  #13  
Old 09-20-2016, 03:28 PM
Greenbiker Greenbiker is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

Question, does the motor open up more going down hill or does it stay at about the same rpm?
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  #14  
Old 09-21-2016, 10:04 AM
Press718 Press718 is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

thanks guys for all your help im going to get a 44t and also get a cdi and see what happens . will let you know what happens...
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  #15  
Old 09-21-2016, 10:06 AM
Press718 Press718 is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

it does a little of both like its trying to open up but it cant.
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  #16  
Old 09-21-2016, 10:10 AM
Press718 Press718 is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

yes it does look like that i still think its something with the cdi for some reason
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  #17  
Old 09-21-2016, 10:15 AM
Slogger Slogger is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

For the price of these cdi's it won't hurt to try a different one.
If it was good you'll still have a spare.
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  #18  
Old 09-21-2016, 10:34 AM
Greenbiker Greenbiker is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

I hesitate to mention it but dielectric grease may not totally solve the problem but it wont hurt it any of you arent already using it. It may be a power problem, so make sure there is nothing between the cdis coil and the magneto on the rotor. No build up or other ablative stuff. However, im feeling more of a carb issue here. Make sure again theres no leaks and that the float, its directional is sitting right side up. If like me, you are using a tank that isnt "kit" (mines a large rack mounted marine tank) make sure you are not getting air in the line, this causes me similar problems with bogginess, sputtering, and dying, but its sporadic, not chronic and consistent, but its something to check. Make sure your air cleaner is clear and not gummed or dusted up or otherwise obstructed. Make sure tour choke is functioning too. If for some reason its loose, it can cause exactlt what you are talking about and in some cases, you might not notice it because what you are doing to close it might be undone by what you do just before you examine it. Someone mentioned jetting, which is something ive never had problems with, but hey cant hurt to check it and learn. I had the choke problem with a cheap two stroke china girl, the choke on the carb was split and bolted together with a cheap screw. The carb set so that the chokes plane of motion was perpendicular to gravity which means it would fall... over the intake... while underway and.... bog.... loss of power... blue screen of death. Took me a bit to figure it out becsuse the arm to move the choke would look likenit was open but the business end would be closed. Periodically tightening the screw solved it. So hopefully its something simple or several simple things.
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  #19  
Old 09-21-2016, 05:52 PM
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scratchbuilder scratchbuilder is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

My engine came with the sq cdi. It went dead. I ordered one from Gasbike, and received the round body type. Once installed, I had no power, it wouldn't rev, I contacted Kc to see if he had the sq body, yes he did. So upon receiving the sq body cdi and installing, she was once again running correctly.The round body on top the engine, the correct one on the engine
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File Type: jpg WP_DS20160921.jpg (1.18 MB, 8 views)

Last edited by scratchbuilder; 09-21-2016 at 05:57 PM. Reason: add pic
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  #20  
Old 09-25-2016, 09:30 PM
Press718 Press718 is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

Thanks for the info im going to buy a new cdi first and if im still having the same problem then I'm going to buy a carb and go from there i will let you know what happens thanks again for ur info..
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