50cc quad

After the last trip it wouldn't start

just cranks over and over and over...

Yanked the plug and cleaned it up... I got fire! The plug is sparking.

nothing yet, just cranks over and over and over...

Cleaned air filter...

nothing yet, just cranks over and over and over...

adjusted carb 6 ways to sunday...

nothing yet, just cranks over and over and over...

yanked the whole damned thing apart to get the carb off of it... cleaned the jets, bowl, everything... carb is spotless... reinstalled...

nothing yet, just cranks over and over and over...

adjusted carb 6 ways to sunday...

nothing yet, just cranks over and over and over...

so wtf ...what could I possibly be missing or what could possibly be wrong at this point?

Help....

You could have had a Suzuki................

Got gas?

stuck or bent valve maybe

2 stroke=no vlaves

it's a gutless 4-stroke

the thing does turn over... sucks a lil air in and there is air comin out of the exxhaust ...or head when I have the plug out

might check the woodruff key on the magneto if it has sheared and allowed the mag to spin on the crank the timing will be off.

Are you sure fuel is getting into the cylinder? IE does the sparkplug smell like gas?

Yea... but I can buy 3 of these for the price of a zuki

...I just hadn't planned on it

no, I'm not sure that fuel is getting to the cylinder... I am sure that the carb is cleaned... but not that it's making its way down ...it does not smell like gas though

might check the compression, I'd think somewhere around 140PSI ?

I'm beyond my scope here ...no compression guage

Stick your finger over the hole and turn it over, you will know if you have compression.

Is there a float bowl drain on that carb? See if you are getting fuel to the carb by opening the drain.

dunno about bent... but I just yanked the covers off and the valves appear to be moving just fine

I did that with the float to make sure the carb had gas in it... no problems there

compression may be the issue... not sure what this thing is supposed to run at... but it isn't like it's blasting my finger off the hole or anything

ignition key, kill switch engaged or stuck, rag in airbox?

My guess is fuel also if you have spark but wanted to throw some simple and often overlooked trys out. When you pull your plug after cranking on the motor for a few seconds, it should be soaked with gas.

If it was timing, it should try to catch just a little, even backfiring.

ok, yanked the plug back out and checked comp... I couldn't force my finger down enough to keep all the air from escpaping so it has a little at least

no problems with ignition, tried it in all positions... will only turnover if it's on.

tried the kill switch and tracing all the wiring... found that if it were disconnected anywhere then it'd still crack over but I'd have no spark

no rag in the airbox... and curruntly it's sitting with the airbox off of it

neither the plug or my finger were soaked with gas

no backfiring no nothing...

sooooooooo... why am I not getting gas into the cylinder?

Check the fuses?

haven't seen a fuse on this thing yet

...I am getting spark at the plug though

Fuse should be near the battery, I had a problem recently that sounded just like this one.

How long has it been sitting.............the jets may have varnished up. The holes in those jets are tiny so hold them up to a strong light to see if they are plugged. One idle, one main, I bet it's the idle the little one.

Have you tried squirting a little gas directly in the cylinder, to see if it'll fire that way?

I'm getting spark at the plug though... if a fuse were blown wouldn't that negate that

I'll check

It takes spark, fuel and air to fire..............you got two of them.

Spray a small amount of carb clener or WD-40 in the mouth of the carb as you crank it, if it fires you have a fuel issue.

I had the whole carb torn apart earlier... took the jets out and cleaned everything up nice and shiny

Eric rode the thing to Boardmanville a few weeks ago... it hasn't started since that trip

I'll go dump some gas into the cylinder now...

can you take the carb off and see if fuel sprays out when you twist the throttle?

I think I lost you on that one..............these little bike don't have an accelerator pump, it takes suction to pull the fuel out of them, if the carbs off, no suction.

just sell the effin thing as is and buy a honda.

hit it with some carb cleaner... no go

...dumped a large quantity of gas in the cylinder... no go

this is one o them there disposable chinese quads... only thing is, I was hoping not to dsipose of it quite so soon

got any starting fluid ?

Bring it with you on Thursday..........sounds like a guys project.

yanked the fuse, checked good and when I had it out the thing wouldn't crank over

nope... I'd probably just sit in the garage all day huffin it so it's better not to have it around

I'll buy the

Bring a fresh spark plug for it.....................trust me.

My 70 quit running last year, spark at the plug, yet no start, fresh plug...........bingo.

Sounds like fun

More fun than a barrel of monkeys ...and everyone is invited

gotta get this thing running before Eric and Evan decide to take me out

Is there some kind of gear interlock? Should it start only in neutral?

Good question....ALLOT of quads have this safety stuff now....and when the circuitry goes bad....you'll go insane before figuering it out...

Those little guys have a bad habit of the valves tightening up. Take the caps off the valves and adjust them and see if it starts.

^^^^ That sounds like good advice, especially since it sounds like the compression is low.


I wonder how the heck they tighten up?

The valves close against the aluminium head and beat the seat deeper each time. Then soon there is no clearance and when the motor is cold it won't start.

If its getting spark at the plug it can't be a "Not in neautral" problem

wish I was going out this weekend so I could help supervise you guys and drink Hozays Beer!!

Course you could bring it by the house one evening this week with a 12 pack and we could cut out the middle men

What brand and model is this one ... I got a sunl 109 had a similar problem after taking the darn thing half apart and tracing the electrcal I traced it to the brake safety switch. Disconnected it and closed the loop, started right up. Also for some strange reason the "alarm" keeps acting up.Good Luck

If it cranks and has spark its not a electrical problem. Like someone said you need gas, air, spark, compression. All at the right time. Could be the plug, just because it sparks when you have it out of the head does not mean it will spark under compression. Try a new plug first -cheap and easy. As for compression you should get about 90psi not 140. The only way too get that much is to do some mods. Also a vacuum leak will cause it not to start. Alot of those chinese machines have cracked intake manifolds.

Actually no... for the lil beginners it even recommends leaving it in 2nd or 3rd gear and removing the shifter from the quad all together until they are ready to shift... so it'll start in any gear

Thanks tres, I wish I had time to do that this week... I'd certainly take ya up on that

I'm hoping it's that simple... the thing did seem to be "cold natured" ...would take a while of cranking and some choke to get'r fired up but after a few minutes running it seemed to have no problems restarting

It looked like the valve was threaded on the end and just double-nutted onto the rocker arm... this sound right?

I'll see if I can't find anything out as for a torque or clearance spec for it... I'm assuming that you'd rotate until the valve is at its fully closed position and then torque it to "x" ...rinse and repeat for the other valve... this sound about right?