Newbies Forum

i got a pit bike that only runs if i run it on neutral hop on it and pop it in first. it wont kick start. i took apart most of motor as far as filter and carb. I took off exhaust pipe because most of exhaust is not coming out of there.  
The bike only runs if i got the throttle blasted and if i go to slow it dies. Idk if something is clogged but where the muffler connects into like the block i think like water came out, atleast tht is what it seemed to me. I could be wrong. Another thing is exhaust is comming more out of a black line like a gassline tube looking thing which could be normal im not sure. Anyone know about pit bikes or what i need to do to make this bike run normal. Please help  

does it tick over ok  
YZ 85
AMCA UK MOTOCROSS
LEICESTER HUNTERS MCC

if u meen kick over ok  no. it wont kick over at all.  

What bike is it? And your saying you have EXHAUST coming out of the breather tube???? Did i read that right?  

yes i believe it is the breathe toob but i am not 100 percent sure. IT comes out of the back righrt by the rear tire. I have taken almost the entire bike apart and everything seems fine. THe bike is a ck-70cc pit bike.  ir un jump on it drop it in 1st while friends are still pushing me then it will finally turn over after a while of pushing me in 1st gear. After 1 ride around the block it dies if not at high high rpm and the exhaust pipe is red hot in the inside and has shot out blue parks or fire my cousin said idk.  Any idead please help.  thanks for the concerns  

I want to help danl, but just don't know these bikes.
It SOUNDS like a valve issue. but dont know this bike like i said. I'm shure you checked the muffler as well for obstructions? Air filter? Reed valve opening?
Air box obstruction? Does it just bog then die?
Is your air/fuel screw set properly?
A stuck valve will cause this. but need to check all. A clogged pilot jet as well.  

it does not bog only when u try to start it (dropping into first while friend pushes me  i am not able to kick start it. the engine gets hot qucik and only will fun with the throttle wide open. If i go to slow the bike will die out. Also muffler gets really realyl hot.
1. I think it is not getting enoguh gas because tht is y muffler can get hot.
2. i think th engine block can be messed up or the vlave is getting stuck which is causing not enoguh air passage ro something which can cause overheating.
this what i herd could be the problem.  Idk someone help me lol i want this thing running. Thanks for the help though yzwoods  

HAve you checked the carb, and or cleaned out the jets? that could possibly cause an idle issue. Do you have a little history about the bike? did it ever run right? if so what where the conditions ? air temp, what state?  

i checked almost the entire bike. i GOT IT from my uncle because it has been sitting in his shop for 2 years. Everything seems fine. Here are the problems i know of.
1. only runs when throttle is wide open
2.overheats real qucik or gets hot.
3. does not kick start only can  pop clutch running with it in first gear and even that is hard to do to get it started.
4. exhaust comes mostly out of a small tube near the rear tire more then the actual muffler.

I think it has something to do with the vlaves. over all the bike is clean and looks like nothing is clogged or anything. pleae help or even give suggstions on what it possibly be. anything will help me at this point.   where would the reeds be as well. thanks guys  

My suggestion on this one, and as I too am not familiar with this bike...

Get your self a manual and do a complete tear down... Take off the cylinder and head, and piston, clean the carbon, replace the ring and check the piston for excessive wear...tear down the carb and soak it in some solvent remebering to take off any rubber pieces. Replace the jets, replace all the gaskets and torque all the bolts to spec. Sounds as tho the bike is ready for an overhaul.

The reeds should be between the carb and the cylinder. Not sure this helps but it's all I can think of for now.

~Mud  

thanks mud  

is there anyone thst can tell me how to get to skipp or do i just got to wait. lol

anymore suggestions guys.  more on wht the problem could be and where located.  

From what you describe "I" believe your problem is your carb. I think your jets are clogged. Basically from sitting around for 2 years it would seem, more like a carb gunked up issue not a valve issue. the tube you say that has exhaust comming out of it is a breather tube. Its gonna feel like there is more exhaust comming out of it then your actual exhaust simply becuase it is a small opening then your exhaust. Smaller opening= higher pressure, Larger opening= low pressure/high volume. I think you need to take apart your carb, re,move the float bowl and clean the crap out of it. Jets, pilot hole...everything. ITs an easier job than a complete breakdown...It just doesn't sound like a valve problem.  

hey man thanks for the help. I took apart the float bowl before and that did nothing. THe jets are they just the small screws ont he side of the carb. I herd tha vlve could be getting stuck or something but i got no clue. I will mess around with the jets thanks. Also y is it getting so hot. IS it because the jets could be clogged. How can the jets be clogged if they are just screws.  

so i adjusted the jets on the carb and it kick started twice for the first time. Now i can get it to kick start anymore. Also when i had it kick started the bike was ideling really high. Anyone have suggestions.  

so did you say u took the jets out and cleaned um or just adjusted them? cuz it sounds to me like its not getting enough fuel and running way too lean that could be your overheating issue.those jets need to be extremely clean!! a tiny piece of dirt can mess up the whole equation.also the screw u can get to from outside the carb is usually the air fuel mixture this should be turned all the way in (ligtly seated) and backed out 1&1/2 turns thats usually the rule of thumb if you dont have a book. as for your valves you can do a compression test and see if thats your problem cuz if your valves are the prob you wouldnt build compression. its  simple test and i think autozone will even lend u the tool.  
VIVA LA 619