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  #1  
Old 09-16-2016, 06:44 PM
Press718 Press718 is offline
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Angry 4 stroke huasheng bicycle engine loss of power

I'm kinda new to this but I have a question for anyone who knows about the four stroke huasheng bicycle engine how can you tell when you're CDI has went bad besides knowing about the spark I'm getting a spark but the engine it has no power meaning it won't go any Faster then 10 miles an hour at Full Throttle it just doesn't go any faster than 10 miles an hour the engine just doesn't have any more power I have changed the spark plug I have bought a new carburetor and I still have this issue with no power it doesn't bog out it doesn't stall it just has no power if anyone can help me with an idea that might be causing this problem I would greatly appreciate you letting me know because the only thing I can think of now would be the CDI...
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  #2  
Old 09-16-2016, 08:18 PM
Press718 Press718 is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

I'm kinda new to this but I have a question for anyone who knows about the four stroke huasheng bicycle engine how can you tell when you're CDI has went bad besides knowing about the spark I'm getting a spark but the engine it has no power meaning it won't go any Faster then 10 miles an hour at Full Throttle it just doesn't go any faster than 10 miles an hour the engine just doesn't have any more power I have changed the spark plug I have bought a new carburetor and I still have this issue with no power it doesn't bog out it doesn't stall it just has no power if anyone can help me with an idea that might be causing this problem I would greatly appreciate you letting me know because the only thing I can think of now would be the CDI...
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  #3  
Old 09-16-2016, 08:32 PM
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scratchbuilder scratchbuilder is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

I've had a cdi go bad, but no spark at all. Make sure your flywheel didn't shear the key and move the timing.
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Old 09-16-2016, 08:41 PM
Press718 Press718 is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

I looked at it today and the timing was on point do you think that if the cdi isn't giving off enough power to the spark plug ? i have another motor and they both do the exact something but the other motor does have a little more power then this one im having the problem with its just seem weird to me.
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  #5  
Old 09-16-2016, 08:41 PM
Slogger Slogger is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

You should check the fuel flow from the gas line before it hits the carb. Pull it off and look for a steady stream. You could also check the gas cap vent.
The spark wire connector in the boot might be bent up or not contacting the plug like it should. Could be bad gas. Could be a spark plug gap too wide.
That's all I can think of that are easy fixes.
Hope you get it running better.
Is your overall gearing (rear sprocket) from a kit? Maybe it's too tall or something.

Last edited by Slogger; 09-16-2016 at 08:44 PM.
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  #6  
Old 09-16-2016, 08:53 PM
Press718 Press718 is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

the sprocket is from a kit and its a 32 teeth sprocket i took the fuel filter out a few weeks ago thinking that was the problem but that wasn't the problem i check the gap in the spark plug it was also good man a this point im just going to just buy another motor lol..
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  #7  
Old 09-16-2016, 09:08 PM
Slogger Slogger is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

32.. seems small.
I'm not a 4 stroke guy, does that sound right, 32?
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  #8  
Old 09-16-2016, 09:10 PM
Press718 Press718 is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

so you think it to small ?
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  #9  
Old 09-16-2016, 09:13 PM
Slogger Slogger is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

Quote:
Originally Posted by Press718 View Post
so you think it to small ?
Maybe.
I was waiting for an experienced 4 stroke Huasheng guy to let us know.
It would be waay too small for a stock 66cc Chinagirl. It would bog out for sure.
They use a 44, mine has a 40 and big hoop 29" rims so it is a little too tall.
Some guys run a 36 with modded engines to get high top speeds.
A 32 would be pretty small.
Edit
I went to gasbike and looked up a huasheng 49cc kit and its rear sprocket was a 44.
Here-
http://www.gasbike.net/collections/e...-stroke-engine
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Last edited by Slogger; 09-16-2016 at 09:17 PM.
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  #10  
Old 09-16-2016, 11:12 PM
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mogollonmonster mogollonmonster is offline
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Default Re: 4 stroke huasheng bicycle engine loss of power

Per displacement, a ChinaGirl should actually put out more power than a comparable fourstroke, and I do believe they do. 32 teeth at the rear wheel is pretty tall. The fact you've mentioned that two motors have behaved the same, indicates that my assumption is correct. Go to a 44t, I'll bet your motor spools out much higher, and you'll be trucking a lot faster than 10. For goodness sakes, most of these smaller motors buck and snort and argue at that low speed, gear down so that motor can get past an idle!

I drop the clutch on Murder around 8mph, or three pedal strokes...
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