80cc Mystery

Pablo · #41 (**permalink**) 06-23-2008, 03:36 PM

Quote:

Originally Posted by MrLarkins

float level is at its maximum

fuel filter queen

jet in carb is clean

float needle in carb is clean

QUESTION:
is it possible that a misbalance on the inside might cause a rpm threshold?

I doubt it's a misbalance - I think your needle taper could be ODD. Tell me this, in the video - when you get to the nasty early midrange flutter - if you hold it there, does the engine die?

MrLarkins · #42 (**permalink**) 06-23-2008, 03:52 PM

hmm, i'll check

Wheel Rush · #43 (**permalink**) 06-23-2008, 06:33 PM

Quote:

Originally Posted by misteright1_99

You are definatly lean... Look at the pic of the spark plug, Might want to raise the needle in the carby (lower the clip) one slot......Parts all look ok though. Also when you put the piston back in the cylinder make sure you line the opening of the rings up with the little pins in the grooves...

8oz @ 20:1 = 160oz of gasoline 128oz = 1 Gallon So 8oz of oil to 1 Gal and 1qt of Gasoline

Any QUALITY oil..... I use Amsoil Sabre....

Mr. Right,

I am not a mathamatician nor a mechanic to speak of, but I

am thinking 128 oz Divided by 20 = 6.4

so 1/20th would be 6.4 ?

Right ?

MrLarkins · #44 (**permalink**) 06-23-2008, 06:44 PM

Quote:

Originally Posted by Pablo

I doubt it's a misbalance - I think your needle taper could be ODD. Tell me this, in the video - when you get to the nasty early midrange flutter - if you hold it there, does the engine die?

no, the vibration is so bad though that gas comes out of the carb through the primer!

misteright1_99 · #45 (**permalink**) 06-23-2008, 07:31 PM

Quote:

Originally Posted by MrLarkins

I will also mix a new back of fuel, 20:1 (real quick, how many gallons of gas is that to 8 oz or oil?)

what brand of synthetic should I be using? best?

Quote:

Originally Posted by Wheel Rush

Mr. Right,

I am not a mathamatician nor a mechanic to speak of, but I

am thinking 128 oz Divided by 20 = 6.4

so 1/20th would be 6.4 ?

Right ?

I am not a mathmatician either so I use a calculator lol. I believe though, I entered the figures correctly. He has 8oz of oil and wants it mixed 20:1. So
8 x 20 = 160 or 1 gallon and 1 quart 128 + 32 = 160. Correct? Sorry if I calculated wrong.....

Wheel Rush · #46 (**permalink**) 06-23-2008, 07:35 PM

OK, but double check, I have a gallon of gas I need X amount of oil for a 20:1 ration, so 128/20=6.4 oz.

Right Sir ?

misteright1_99 · #47 (**permalink**) 06-23-2008, 07:44 PM

Quote:

Originally Posted by Wheel Rush

OK, but double check, I have a gallon of gas I need X amount of oil for a 20:1 ration, so 128/20=6.4 oz.

Right Sir ?

You are correct but his question was "I have 8oz of oil, How much gas for 20:1"

Pablo · #48 (**permalink**) 06-23-2008, 08:09 PM

Quote:

Originally Posted by MrLarkins

no, the vibration is so bad though that gas comes out of the carb through the primer!

Argghh...but hard to determine if this is a cause or effect.....

MrLarkins · #49 (**permalink**) 06-23-2008, 09:26 PM

rgr that...bikes tore apart for two days whilest the rear wheel is in the shop for axel/freewheel repair and bearing overhaul!

**Norman** · #50 (**permalink**) 06-23-2008, 09:30 PM

you must have a flywheel let loose if its shaking the fuel out of the carb at least that is what I'd look for but to do that you need to take it apart and possibably split the crankcase.