bike having trouble up 20 degree incline

[blckwlfny1]

This is my first bike so i dont know what to expect:
I have a worksman newsboy... 42 tooth sprocket... brand new (about 45 min of use on it) "80cc" skyhawk... no tensioner (motor is shimmed) ...i weigh 220#... formagasket around carb/manifold joint.
When i go up a 20 degree grade the engine would die if i didnt pedal to keep it going. The motor also wont move from a standstill without some serious feathering of clutch and throttle. Also, the motor runs best so far with the choke slightly on (about 1\4 of the way)
Is this ok, or is something wrong?
thanks

 

[Fulltimer]

It sounds like your sucking air somewhere around the carb. Snug everything up good an tight and see if that helps. You may need to replace the gaskets with something good instead of the junk that is on it.

Terry

 

[GearNut]

You always need to pedal start the bicycle to get it in motion. These engines are an assist device. They just do not have the torque to get you going from a dead stop.
You will fry the clutch trying to get it to do that.
As for climbing a 20 degree incline you also will have to pedal. The engine will get stronger as it breaks in though.

 

[blckwlfny1]

Where else would the engine be sucking air in from?

 

[gothicguy64]

i had (have still ) . a rocksolid shaft bike mark 1 , 3 spd shaft pushie
with rock solid 50 cc hp2 with extras .
pipe is the long street and i could spin wheel i let throttle go fast .

i built motor to handle nitro

i had to pedal to move then i let clutch go an beat buses an a few cars to 55 kph
i blew the shaft an real wheel

new bike is a 21 spd stock moutain 20 inch frame
and i intend to use sbp jack an expansion pipe
when finaces can afford the cost
no more single spd for me an i weigh 72 kg ..
:helmet::helmet:

 

[GearNut]

Where else would the engine be sucking air in from?

Where the carburetor attaches to the manifold and where the manifold attaches to the cylinder.

Let the engine idle and carefully spray the areas one at a time with a spritzer spray bottle and water. If the idle speed increases or decreases, changes in any way when you spray an area you have found the air leak. Sometimes all you can tell is a change in the sound of the exhaust note if it is a tiny leak.
The water will temporarily seal the leak and that will cause the engine speed to change.

You can do this with flammable sprays such as carb cleaner, brake cleaner, WD40, ect. They usually give a more distinct change when you spray a leaky spot, making them more user friendly in that respect
Be careful though, don't set anything on fire, and do not spray into the air cleaner. If it gets sucked into the air cleaner it will also change the speed and exhaust note and give you a false reading.

 

[motorpsycho]

i have to disagree on the fact that you always have to peddle to get a mb going.
I hardly ever peddle either of my bikes, maybe on occasion just to get moving if i'm on a hill when i start out, but most of the time i just use the clutch and take off from a dead stop.
my engines have plenty of torque to get me and the bikes moving, and climbing hills is no problem with either of my bikes on just the motor by itself.
one bike has a 49 c.c. 2 stroke, a 41 tooth rear sprocket, 20" wheels with a 21.5 inch tall rear tire.
the other bike has an 80 c.c. 2 stroke, 41 tooth sprocket 20" rear wheel, with a 24 inch tall tire.

i only weigh 155 lbs. so maybe that is my advantage, plus both of my bikes are 20" frames (an old schwinn stingray, and a newer schwinn o.c.c. chopper)

 

[blckwlfny1]

Ok...
Tightened the manifold screws and checked for an air leak. Didn't find one. Bike runs like a champ at idle and on level ground. At the Slightest incline it bogs down and throttle makes it worse. I tried feathering throttle but not much difference. 1/4 Choke is not helping either. 1/2 makes it worse.
Fuel/oil @ 16:1
If I replace the plug, what size do I get. I don't see how to replce the wires without swapping the whole maagneto. ....any OTHERS suggestions

 

[robimagu]

To me it sounds like your float may need to be adjusted. Another thing that can happen (at least to me) is the float "tickler" is stuck in a down position and flooding the carburetor with excess fuel.

 

[blckwlfny1]

Help!

UPDATE: I. Have a REVERSE throttle....the more fuel I give the motor, the slower it goes. Uphill...downhill
A DAY wasted....I couldn't find a replacement spark plug
I also Couldn't find a way to replace the wires
Cleaned an re-gapped the plug I have...no difference
I have NEVER done anything more than assemble mechanical parts.
Adjusting the carb is not something I ever thought I would have to do. Nbr do I think I will be successful at it. This STINKS. As it stands now, my new bike...investmenbt of time and money is sitting useless...HELP!