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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your bicycle motor and what needs to be done to achieve top performance.


Engine spluttering when I hit 20mph...

Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your bicycle motor and what needs to be done to achieve top performance.


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  #31  
Old 02-14-2013, 05:04 AM
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Default Re: Engine spluttering when I hit 20mph...

I use gates or dayco fuel line with a see through filter.
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  #32  
Old 02-15-2013, 07:03 AM
dimentio dimentio is offline
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Default Re: Engine spluttering when I hit 20mph...

I can't seem to shake the problem. This motor i have is kinda beaten up. When I crashed my Schwinn riverside cruiser, i was able to salvage the motor from it. the motor has been thru a lot of trauma. rain, snow, i've even fallen once or twice on the genesis 29 i mounted it on. I even got swiped by a car a few weeks ago while i was parked. so i think its time for a new motor anyways. just got my RT carb in the mail yesterday. i just ordered a new motor this morning. Im just gonna wait for that and redo the bike. I also got a expansion voodoo chamber, i just need to take it to a shop to get it bent.
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  #33  
Old 02-15-2013, 01:43 PM
nightcruiser nightcruiser is offline
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Default Re: Engine spluttering when I hit 20mph...

Though you're motor may be beat up, didn't it run well before you changed to the new carb and intake? My guess is you need to TUNE the new carb, and you will probably have to tune the carb on the new motor too. If you want to experiment while you're waiting for your new stuff, either put your original carb back on the old motor and see if she runs better, and/or, move the float and jet (and air filter if it is different) over from the old carb to the new carb. My guess is the float setting is different on the new carb, move the float, move the setting. Or the jet could be not exactly the same size. My guess is it has more to do with the carb swap than the new intake or how beat your motor is. Good luck with your project...
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  #34  
Old 02-15-2013, 04:00 PM
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Default Re: Engine spluttering when I hit 20mph...

In my opinion, your not going to get what your looking for if you don't know how to work on these engines and understand the principles of how an engine operates. Buying an engine and slapping on a bunch of parts without knowing how to tune your engine and conduct to basic diagnosis is asking for hours of frustration.

Take the time to properly setup your engine and have an understanding of what you are doing before adding any modifications. Teach yourself.

This forum has a wealth of information if you are willing to search for it and ask questions of other members and use the information that is given. Sometimes a problem can be solved with a quick question and a quick answer. Other times it requires testing of different components to see if the problem is resolved. Unfortunately we live in a society where everyone wants a quick answer and is not willing to take the time to teach themselves. We want some one else to solve their problems.

Good Luck with your new engine.

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  #35  
Old 02-16-2013, 07:48 AM
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Default Re: Engine spluttering when I hit 20mph...

I think Dimentio's on the right track. Everyone has their style when it comes to experimenting around with these funky engines.
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  #36  
Old 02-16-2013, 03:44 PM
dimentio dimentio is offline
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Default Re: Engine spluttering when I hit 20mph...

I got my voodoo expansion chamber hooked up with the RT carb, my bike runs better but i still have low torque at low rpms. im going to try using rubber pads on the motor mounts and using one of the bigger jets provided with my RT carb.
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  #37  
Old 02-16-2013, 04:30 PM
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Default Re: Engine spluttering when I hit 20mph...

Rubber mounting is a bad idea, it just allows the engine to flop around. It's not going to help running issues.
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  #38  
Old 02-16-2013, 06:50 PM
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Default Re: Engine spluttering when I hit 20mph...

What you have is a small 2 stroke engine that does not develop a lot of torque at low rpms, a 4 stroke will have more low end torque. If you need low end you can change to a larger rear sprocket, but the top end speed will be slower. I just pedal at start or on grades.
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  #39  
Old 02-16-2013, 09:16 PM
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Default Re: Engine spluttering when I hit 20mph...

A two-stroke will have better power at any given state of tune. Twice as many power strokes.
Four-strokes are only playing catch up from the start.
Motocross had to give them twice the displacement to make them competitive with the ring-dingers.
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  #40  
Old 02-16-2013, 09:48 PM
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Default Re: Engine spluttering when I hit 20mph...

I have owned 4 2 stroke dirt bikes and am aware of power for racing at high rpm, what Im saying is we are on a bicycle and sometimes you have to help these little engines out.
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