ATV Florida Forum

first i would like to introduce myself, my name is clayton and i live in upstate ny, i am a 27 year old custom car builder. i dont wanna bore you with my life details just thought id introduce myself as i am brand new to the forum. so straight to the problem i guess.


first problem is i bought a roketa gk-19 250cc buggy. i bought this brand new and since day 1 i have had nothing but problems. and the particular place i bought it from must not employ enough people to answer the phone.

anyway this is pretty long but i am trying to put in every detail i can think of so it may better help someone understand what the problem is

i rode the buggy a while ago as i was getting ready to winterize it and wanted one last ride. anyway while riding it after about 15 minutes it started getting doggy and sluggish a bit. it was spitting and sputtering some and i just assumed it was bad gas. so i brought it home and parked it put some fresh gas in it and started it back up. this time it started pretty hard and i let some of the new gas run through it. about a week goes by, i tried start it to drive it into the garage for storage but it would not start, it wouldnt even turn over. the battery completely dead. so i pushed it to the garage threw the trickle charger on for a few hours, 

when i came back and tried to start it nothing. it would catch and backfire some but would not start after a while of trying and trying. i did manage to get it to start if i held the throttle flat out full throttle. being theres no neutral position on the buggy i had it up on blocks without the back tires touching. anyway it would run full throttle for about a minute and die. if i kept screwing with the throttle (pumping it) i could manage to keep it running a bit longer. so i ran some carb and choke cleaner through it didnt do anything.

so i decided to take the carb apart and clean it. i could not find a single speck of dirt in it. i put the carb back on same thing. would not start unless held wide open. now being that i have been goofing off trying to start it i have fried the starter relay. ( i ordered one its on its way already)  i also ordered a cdi because now its backfiring out of the carburator and i think maybe the cdi might be controlling the timing improperly. thats my only two ideas.

i did however change the ignition switch as i apparently wore it out trying to trouble shoot my problems. and get it to run. now i have spark and i know its getting gas if i turn it over with no plug in the whole it sends gas out of the spark plug hole.

anyone have an suggestions. like i said i ordered a new cdi box. i also have a new starter relay coming. i can get it to turn over if i jump the starter relay but all it does is backfire sometimes out the carb sometimes out of the exhaust.

like i said i know i have spark i can see it spark if i ground the plug against the engine and turn it over. does this sound like a carb problem? or is this just something really dumb that i am over looking

thank  you very much in advance im pulling my hair out on this dumb thing. i spent 2500 on it and would like to be able to ride it.

clayton

Change your plugs.  They may have fouled up.
Have you checked all your tubes?  Sometimes there's a tube from the motor that pressurizes (?) the fuel to the carb, or perhaps it acts as a fuel pump.  If this is not on, it's not pumping fuel to the carb.
Just a few thoughts...

i know the plug i good. and i know fuel is getting to the carb because after a while of cranking gas runs out of the carb as it floods istelf. but i did think of the fuel not getting to carb so i disconnected it from carb to see if gas would pump out. and i pumps just fine. thats why i was leaning towards the cdi box crapping out. i will know in a few days when i recieve it. i picked it up off of ebay for 9 bucks. the manufacturer wanted alot more than that.

i have also been reading on how the cn250 carburators are junk and that i should just replace it with a mikuni (sp?) with a manual choke. but i dont know if want to do that yet. i will see what happens with the cdi.


thank you very much for your reply, if you have any other ideas or suggestions i would greatly appreciate it.

thanx
clayton

UPDATE

i changed the cdi box.... that wasnt it.. when i changed it i no longer had any spark at the spark plug at all. so i put the old cdi back in and had spark again... maybe a bad cdi? who knows im about to pour 5 gallons of gas on it and burn it.

and what makes things even worse the f&@king manufacturer is a joke.. cant get ahold of anyone for technical support.. i think i may end up taking this somewhere to have it fixed. either that or i have a v-twin motorcycle engine and transmission im not using for anything..

please guys if you have any ideas let me know. my next buy is gonna be a whole new carb... which i just tore back down a few minutes ago.... completely squeaky clean not even a fingerprint on it anywhere. everything is totally clean. but i have read that the cn250s are known for junk carbs straight from the factory.

Air
Fuel
Spark

The three ingredients that every cumbustion engine needs.

Air - Is air filter clean?  Is choke stuck closed?  Any debris blocking air flow?
Fuel - Is Carb clean?  Fuel tank with debris?  Is there a fuel filter that may be clogged?
Spark - Spark Plug and/or plug wires.  CDI. 

I know it's not just that simple, but those are the basics to check for...
OK, well that taps MY knowledge of motors.

I most deffinetly appreciate your response, your absolutely right sometimes back to basics is the way to go. i went way back to basics this morning. i tore off the carb again and cleaned it again. still no debris. i do have it running now but only with the idle screw all the way in so it idles wicked high.. i think i just need to adjust the carb a little and clean out that damn electric choke. i think thats all my problem the auto choke deally that i know absolutely nothing about...

anyone know how to clean it??

i feel better now that it runs lol

atleast its not a blown motor or anything too crazy

clayton

anyone know what would happen if i unplugged the auto choke and took it off???

alright so i figured it out finally..... it was the gas tank... well not the tank its self but the part the fuel lines hook to... it is a two way pump dealy thing. it has a fuel line with a filter that goes to the carb. then it has another line that moves air. well anyway i wasnt getting proper gas to the carburator i was getting mosty air.... now i just gotta get this carb adjusted.. its fine at half throttle but it spits and sputters at full throttle.

any suggestions would be appreciated...

Sell it...now!

Best move you could make... then go buy a Honda Pilot!

Valves are tight, adjust them.