Jacob Blocker

39 minutes ago, mark7170 said:

Any updates on the smoke issue?  I'm about ready to go after a similar problem.

I ended up just buying a new jug and piston set and it fixed all my problems. If it's not smoking to bad and you haven't let the engine run for to long I'd let it run for a while first.

7 minutes ago, steve shugart said:

some smoking is normal for a break-in period but if you are getting excessive smoke it could be the wrong size piston/ rings setup, were the rings in the correct order? were the ring breaks alternated on the piston? hope this helps!

I didn't replace the Piston and rings so I'm not sure the sepcs or anything. I got new rings just to make sure there right and I'm replacing the valve seals also. I also got up sized rings if I need them.

2 minutes ago, Ajmboy said:

What year is the suzuki eiger? Are you using the correct oil? From how you describe it, it sounds like oil is getting into the combustion chamber. How's the air filter look, is it oil soaked?

* Added ATV info to topic title and moved to Suzuki forum.

its a 2007 with like 4k miles. I did not have the filter on when testing it.

I got an ATV from a guy that ran out of time rebuilding an eiger 400. He put a nerma Piston and rings in. I finished it up and it smoked like a train. I took the head off and honed the walls and it looked like the rings where on the walls, but it smokes just as much. I'm confused what's wrong with this thing.

When i got my 300ex the carb was kinda wreaked, it had some sand in it that i got out, but the choke lever is melted off and the throttle sticks, what would be a good replacement, so far I have replaced the cdi with a non rev limted one and i am currently re building the engine with OEM parts/ Also i would rather not spend over $100 on the carb, but im fine with it being used if it works fine.

27 minutes ago, davefrombc said:

Either  rings or  valves..  Check the  valves to be  sure  neither of them  are being held  open   by maladjusted  valve  lash . If they  are set correctly  then  it is  most  likely  a ring problem.

There  is  a way to  check to  see if  blow by  is due  to a bent or  burnt  valve or    rings. It  requires  a  compressor  though ..  You  bring the  piston to  exactly top dead  center  on compression.  Connect  and  air  hose to  the  spark  plug  hole and  apply pressure. If  you are  at  top  dead center, the piston  will  not  move  down.... any  off either side  of  TDC  and  you  have to  try  again  because the  piston  will  move  down  and a  valve  will open.  Once  you  have the  piston  TDC and pressure  in the  cylinder you will  be  able to  tell if pressure is  getting  by  the valves  and  escaping out the  carburettor  or  is coming out of the  crankcase  breather  because of  bad  rings.

Alright I'll try that, also when when ever I try to start it up there is smoke coming out of the carb and engine breather, I don't know if it comes out the exhaust tho, 

I have not been able to start my 300ex that I just got off a guy. I was able to getting it running once, then never again. After a week of trying to make it run I got a compression tester and it is saying about 30 psi. Is this definitely the rings just worn out or can it be something elses? I can't even make it pop when I spray stater fluid in it.

something else i noticed today is that there is smoke coming out of the carb also

7 minutes ago, davefrombc said:

I'm  not  sure  what  your  smoke is ..  It  could  be  from  ring  blow by  if it is   smoke  from fuel  actually igniting even though the  motor  refuses to  start or  it  could  be water  vapor  if  there  is  a lot of  humidity  and  cold  air from the  crank  case  " breathing".  There  will  be  movement  in and out  of the  crankcase  as the  piston  moves  up  and down  in the  bore.  You  normally  don't  see  that  because  the  crankcase  breather is normally  connected  to  the  air box so  it is  "breathing "  clean  air and it  is  the  only way  the  air  has access  to the crank case. The  reason this  happens  is  because as the  piston  rises  to the  top of the  bore  for intake  or  exhaust it is  in effect  making the  airspace  inside  the  motor  greater, so  air   comes in to  fill that  space. When  the  piston  moves  down  in the   intake stroke  or  power  stroke , it effectively  makes the  air  space in the  crank  case  smaller,  compressing  the  air  in there which then  vents  out through the  breather  tube to  the  air  box. There  isn't  a  great  deal  of  air  exchanged  during  each  cycle ,  but if that  breather  was plugged, any ring blow by would  build  pressure in the  crank case  and   soon  blow the  seals in the  motor.  Under perfect  conditions  of  zero  blow by, you would  never  get crank case  pressure  build  up since  the  piston  moving  in the  bore  would  only  slightly raise and  lower  crank case  pressure  as the  volume  changed  up  and  down  with the  stroke.  Long  story   to  say that  light  air  flow  you  find is  perfectly  normal  and expected. 

 

I would rather not take the engine apart to find out, bu i might have to soon. The one time i was able to get the engine to run (it was cold) it had a good bit of white smoke and when i killed it it left a kinda lingering smoke at the tip of the pipe. I also find it strange how hard it is to start it, although it could just the the carb (i have cleaned it a few times).

after further looking i have a video and i also fell a bit of air coming out of the hole. 

here is the video - https://youtu.be/l9Z-uiFRSJ8

I have been trying to get my 300ex to start for sometime. a few days i got it to start over and over and then the next day it wont start. I do the value lash and keep the covers off. I was (prob exhaust) smoke coming out of the covers with for the valves. I also noticed that the crank position marker had smoke also coming out, but i just thought it was from the head and it being in the cold. The hole for the position marker also has air come out when it turns over, but it is very light of air flow.