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carb choke and oil mix


Discussion at Motorized Bicycle Engine Kit Forum in the High Performance Bicycle Engine Tips forum. I got this kit and am running it at 20:1 with synthetic oil. Right now I have to run ...
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Old 08-20-2009, 01:29 PM
Motorized Bicycle Elite Member
 
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Location: austin tx
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Default carb choke and oil mix

I got this kit and am running it at 20:1 with synthetic oil. Right now I have to run it with the choke wide open, and the Idle screw all of the way in. If I thin out the mix to 32:1 or less then would I be able to close off the choke? It rich right now, though no oil is leaking out of the exhaust. I've already moved the c-clip to the top notch on the needle. With synthetic oil, I figure I could do a 40:1 mix. I'd like to know if this thought process makes sense or am I missing something else?
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Old 08-20-2009, 01:37 PM
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Default Re: carb choke and oil mix

yer supposed to run a warmed up engine with the choke wide open

best to use the words rich /lean when you are talking about fuel/air mixture ... it is very confusing if you use those terms with reference to oil/fuel mix
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Old 08-20-2009, 01:42 PM
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Default Re: carb choke and oil mix

sorry, it aint your fault, lotsa people scramble terminology like that

... if yer an idiot like me it's even more confusing than usual...
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Old 08-20-2009, 01:52 PM
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Default Re: carb choke and oil mix

Thanks for the info. I always get confused with that dang'ed ole choke. So I'm getting between 20-22mph. If I thin my oil/fuel mix out, that should increase my speed. Right?
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Old 08-20-2009, 02:36 PM
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Default Re: carb choke and oil mix

dunno about top speed... but your motor would probably benefit from a mix that was closer to the oil manufacturer's recommendation - thinking of less gumming up of the head.
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Old 08-21-2009, 01:18 PM
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Default Re: carb choke and oil mix

Quote:
Originally Posted by restapukin View Post
yer supposed to run a warmed up engine with the choke wide open

best to use the words rich /lean when you are talking about fuel/air mixture ... it is very confusing if you use those terms with reference to oil/fuel mix
Yes.. it gets ridiculous. On one occasion three individuals were communicating and only problem was they were on completely different subjects! A case of "Leaning Tower of Babel".

Choke is open or closed. Clutch is engaged or disengaged. Gas/oil is thin or oily. Gas/air is lean or rich.

Made more confusing because more oil in gas actually makes it "lean" not "rich". Somehow I don't think things will change much though.

Hey Moe! Hey Larry! Shaddup cement head!
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Old 08-21-2009, 01:49 PM
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Default Re: carb choke and oil mix

"Choke is open or closed. Clutch is engaged or disengaged. Gas/oil is thin or oily. Gas/air is lean or rich."

say it again, like a mantra... or something

xlite - that is the most succinctly relevant post i've read all week, how right you are, you are way way ahead of me man
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Old 08-21-2009, 06:16 PM
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Default Re: carb choke and oil mix

I've been referred to as "ahead" before. Not sure if it's meant as insult or compliment.

In any case great minds do think alike.
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Old 08-26-2009, 12:36 AM
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Default Re: carb choke and oil mix

I'm a newbie and just learning all of this stuff. So I should have my choke all the way open all the time? I just figured out that if i turn the idle screw all the way in the engine won't die when the clutch isn't engauged like it used to.
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Old 08-27-2009, 03:42 PM
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Default Re: carb choke and oil mix

take off your air cleaner look at the choke plate pull up the lever the choke is (ON) put the lever down the choke is (OFF) with the choke off this is the normal riding position. Then I'll bet you can then adjust your idle speed.
screw the idle in for a faster idle screw it out for a slower idle.
20 to 1 mix is 20 parts fuel to 1 part oil used most of the time for breaking in a new or rebuilt engine 32 to 1 is what most use for after break in. I've been using a syn oil lately at a 40 to 1 mix and so far I like it more power and cleaner running plus no smoke out of the tail pipe.
Most engines run the best with the E-clip on the #2 slot from the top or fat end of the needle on the carb slide and a 0.70 mm main jet or a o.65 mm main jet. I use mostly a 0.65 main jet.
The main jet hole needs to be precisely drilled not egged or out of round.

Norman
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