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| Motorized Bicycle General Discussion Topics on bicycle engine kits, help articles, repair and modifications for your motorized bicycles |
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11-08-2009, 10:03 PM
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Motorized Bicycle Senior Member
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Join Date: Aug 2009
Location: usa
Posts: 78
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engine problem
so i finally got my engine installed up and running,but i have a major throttle problem i can get it started fine,it idles fine,and when i have the clutch held i can give it all the gas it can handle but when the clutch is not held and i try to go then the engine puts to a slow death and i have to restart just for the same result,its still on its 1st tank of gas if that has anything to do with it but how can i fix this?
Last edited by rickie h; 11-08-2009 at 10:22 PM.
Reason: type-o
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11-08-2009, 10:17 PM
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Custom Builder / Dealer
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Join Date: Mar 2008
Location: Los Angeles, CA.
Posts: 4,421
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Re: engine problem
Are you also pedaling to help it take off?
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11-08-2009, 10:18 PM
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Super Moderator
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Join Date: Sep 2008
Location: Littleton, Colorado
Posts: 6,754
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Re: engine problem
The first question will be what is your fuel mix ratio? The manuals will tell you 16:1 but most of us consider than a little oil heavy. 20:1 to 24:1 is a better mix. Are you using the choke lever? When the engine starts, give it a few seconds, 20 to 30 and allow it to warm before opening the choke. Some require more time. Some of these engines are cold natured and need a bit more choke before they run good. Get back to us; we're here to help.
Tom
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11-08-2009, 10:33 PM
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Motorized Bicycle Senior Member
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Join Date: Aug 2009
Location: usa
Posts: 78
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Re: engine problem
venice-i simply pedal it up to speed clutch held in and let go of the clutch and it starts up fine.
2 door i beleive i have choke on to start and flip it off after a few seconds of running but i dont think i ever waited 20-30,maybe thats my problem....tommorow after school ill try waiting a bit longer and as for my ratio it started 20-1 but my uncle told me that sounded too rich and maybe thats why i had my throttle problems so i added a bit more gas and its now around 32-1 but it started at 20-1 like i said
Last edited by rickie h; 11-08-2009 at 10:34 PM.
Reason: added info
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11-08-2009, 10:39 PM
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Custom Builder / Dealer
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Join Date: Mar 2008
Location: Los Angeles, CA.
Posts: 4,421
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Re: engine problem
Quote:
Originally Posted by rickie h
venice-i simply pedal it up to speed clutch held in and let go of the clutch and it starts up fine.
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I'm not talking about just starting... You can't just take off from a dead stop like it's a motorcycle, you have to use the pedals for the first 20 or so feet to help the engine take off. (even after it's started)
Also... choke lever 'up' to start, 'down' after it warms up, like 2 Door said...
Tell us how it's going?
Last edited by Venice Motor Bikes; 11-08-2009 at 10:43 PM.
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11-08-2009, 10:44 PM
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Motorized Bicycle Senior Member
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Join Date: Aug 2009
Location: usa
Posts: 78
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Re: engine problem
yeah,ive tried reving it from a dead stop and from pedaling around 8-10 mph and both get a similar result tho the dead stop dies faster than the up to speed pedalling
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11-08-2009, 10:57 PM
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Custom Builder / Dealer
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Join Date: Mar 2008
Location: Los Angeles, CA.
Posts: 4,421
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Re: engine problem
Hmmmm.... ok.
Is there a white lever on the side of the carb? If so, it is a fuel shut off, & should be pointed down for the gas to be on.
(I'm just running through a little check list of things for you to check; so just kinda bare with me here.)
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11-09-2009, 12:01 AM
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Motorized Bicycle Senior Member
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Join Date: Oct 2009
Location: Boulder City, NV
Posts: 51
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Re: engine problem
If you keep having problems after the good advice above, check your fuel line. I had a similar problem when I first finished my bike. I would get fuel flow, and it would start and run ok with no load, but under load, it would starve out and die. It was clearly starving. I put on a clear fuel filter below the tank. You could see it run dry. I took off the tank and shut-off cock, and rinsed and blew them out, and also disconnected at the carb and made sure there were no air pockets. I didn't 'see' anything in cleaning, but theory is there was some piece of metal filing or such. All fine now. And make sure the gas cap is venting. There is no fuel pump, it just has to trickle down, and does not take much to shut off or slow down flow.
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11-09-2009, 11:14 AM
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Motorized Bicycle Senior Member
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Join Date: Aug 2009
Location: usa
Posts: 78
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Re: engine problem
venice-my shut of valve is on the tank theres nothing on the carb like that and dont worry ill bare with ya as long as we need
hauser-...that may be it...ill look into that..good idea
just curious when i clean it do i just wash it out with water and blow it out with an air hose?
Last edited by rickie h; 11-10-2009 at 08:48 AM.
Reason: need to ask a question
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11-10-2009, 04:07 PM
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Motorized Bicycle Senior Member
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Join Date: Aug 2009
Location: usa
Posts: 78
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Re: engine problem
something is wrong...i came home today and went to clean my gas tabk out to find it empty...i them found that all my gas dripped out my exhaust!whats wrong?
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