i get it rumbling feels like it tuggs once then jus rumbling PLEASe help

:cool2lease help any suggestions i get peddling i let got clutch and it rumbles well and feels like it tuggs once or fires once then just contunies to rumble usely it would just start right up . i got the right mixture tried with out kill switch with throtle down(open) and up(shut) replacement spark plug the kit came with sky hawk gt5 80cc and with all that tried i still cant pin point the prob im guessing its the cdi or magneto i want opinions befor i switch them out :bowdown: Is ther a way to test if the magneto works? all suggestions are aprieated i suck at spelling but Thank you :helmet:

 

Check for fire from the spark plug...
Remove plug, ground to engine, spin engine over by spinning the rear tire over either by hand or as you would start it. Mag resistance should be in the range of 300 to 400 ohms.

 

thank you any other suggestions would be vvery aprieated

 

is the gas shut off valve open? fuel filter plugged up? kinks in the fuel line? float in the carb stuck?
check for spark first...you should have a constant, strong spark at the end of the spark plug when you do what al said to check for spark.
if you have good, strong constant spark, then you more than likely have a fuel problem or a REALLY bad air leak...possibly a bad head gasket.
is this engine brand new, or has it been ran before?
check your wiring connections and get rid of the snap together wire connectors. solder all wire connections and cover them with heat shrink or black electrical tape.
make sure the white wire coming from the engine is not touching anything and is cut off clean and covered with heat shrink or black electrical tape. make sure no wires have rubbed through or broken insulation. make sure no bare wires are touching the frame or the engine.
if you have anything hooked to the white wire, disconnect it and try to run the engine.

 

thank you the engine is a month old and has worked amazinginly with no issues what had happend is i got a flat tire fixed it the same day it was working fine as soon as inertube is changed it doesnt want to start thank you for your time your bike is siccckkkk

 

Have you tried Al.Fisherman's suggestion yet?
Remove the spark plug from the cylinder head.
Check the gap between the center electrode and ground electrode. It should be 0.25" to 0.30".
Keep the spark plug connected to the spark plug wire and tape it down to the cylinder head if necessary.
Go pedal around in the dark of night while letting the engine crank over. You should see a strong blue spark from the spark plug.

If that works we'll move on to the next possibility. If it does not work we'll work it out.

 

you explained perfectly thanks you for taking the time im gonna see if it sparks will up date shortly

 

here's a simple one that had me flummoxed for a while---make sure your plug is properly tightened into the head

 

hello every one i finaliy replaced the spark plug , cdi and magneto and nothing still same results jus rumbleing doesnt sound like its burning i m out of sulotions so if any one has any opinions i would greatly appriete

 

Do you have spark now?

 

ok im going to try that do i have to ground the spark plug when i take it out?

 

The base has to be grounded. If tape is not a option for you take some wire, like single strand 16-2wg etc (house wire it's stiff, the kind in the walls) the portion that is to be used on the plug and engine, remove insulation , and wrap around the plug, just under the hex portion, take the other end and ground (wrap) somewhere like the engine mount, under a case screw etc....

 

happy to report that there is a spark so electrical is working fine ill use today to try to get is started i ran it with the spark pug out six a.m. and i could see a brite blue constant spark so im going to try to get it going to today ill let every one know

 

if you have spark now, it should run UNLESS your magneto magnet is on backwards. this would throw the timing out 180 degrees so it would be firing on the wrong stroke.
another thing to verify is to make sure that there is gas getting into the carb bowl. make sure your float is not stuck up. this would cause the needle and seat to remain closed, not allowing any gas to get into the bowl.
if i were you, i would spray a shot of starting fluid into the carb and then try to start it.
if it fires, then you have a fuel problem.
if it does not fire, then your timing is off.
another thing could be a head gasket problem which would cause no compression and the engine will not run.

 

yes i do have a spark now so maybe my carb is too full of mixure ? i know the mixture right

 

ive noticed the float is hard to push down some times does this mean any thing

 

You cannot touch the float unless you have the carburetor taken apart.
What part are you referring to when you say "float".

If the carburetor is overfilled with fuel, it would be flooding. Fuel dribbling out of the air cleaner, assuming that your carburetor is mounted so it is sitting flat and level as it ought to be.

 

I'm betting that he is referring to the primer button on the side of the carb when he said "float".
if the primer button is hard to push, then something is wrong inside the carb. That primer button should be easy to push weather the float bowl is full or empty. if in fact you are referring to the primer button when you said "float".
if your float bowl is full of fuel, then fuel should be getting into the engine. but if your float (inside the float bowl) is stuck in the up position, and the float bowl is empty, the needle & seat would be closed (as if the float bowl were full of fuel) and no fuel would flow into the float bowl, and no fuel would get into the cylinder.
if your float were stuck down, your carb would be leaking fuel all over the place because the needle & seat would be open (as if the float bowl were empty) and fuel would be flowing into the carb all the time causing it to come out of the overflow tube, and possible out the back of the carb. Fuel would work it's way up through the main jet, past the slide needle and start leaking out the back of the carb.

I really think you have something simple going on here, and i am betting that it's a fuel related problem. My guess is that no fuel is getting into the engine at all, and that's why i suggested spraying a SMALL shot of starting fluid in the back of the carb and try to start it.
Like i said before, if it fires on starting fluid, then you have a fuel problem.

 

im going to open up the carb to see if anything is stuck

 

i put straight gasoline on the air filter sponge to see if it would start and it just kiked alittle more than useal but did not start