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Posted by: 2manytoys
You may have a head gasket that went bad. If you clean it off with degreaser or spray it with brake clean can you see where exactly it is comming out? Sounds like you got some good years out of the little 50. They are pretty tough. If you need parts Raceway can help.
Posted by: 2manytoys
If he was in water it may have cracked because of the cold water and hot motor. Does it still run?
Posted by: 2manytoys
There is no oil pump. It is splash lubricated. It could be that it took on water and the crank case is over full. I would drain the oil and refill it.
Posted by: 2manytoys
Im sorry I was thinking it was a 4 stroke. I have a KMX 50 not KFX 50. If the exhaust is loose it will have no power, if the pump is bad it may be injecting too much oil. Also check the air filter to make sure it is not plugged with mud. This will also make it run bad. I can almost bet is either has water in the case or the filter is clogged.
Posted by: Fastestdad
You have to turn it upside down and crank it over by hand till the intake port is uncovered/open and if it has water it will run out the intake/ carb when the port is uncovered. Had to do it on a couple bikes before I quit ridin in the really deep stuff and getting stuck. I'd say if its smoking its oil related. Put your hand over the exhaust and run it and see what you got on your hand oil or water comin out.
Posted by: Cfamracing
I had a similar experience w/ my son's 03 LT50. The crank seal on the trans side leaked trans oil into the combustion chamber and puffed out tons of smoke. Unfortunately, you have to split the cases to replace the seal. Get an owners manual if you are going to replace it yourself. Good luck!
Posted by: Cfamracing
Sorry, I meant Service Manual.
Posted by: Cfamracing
I'm refering to the oil seal on the crank on the trans side. Take a look at this link. It's a parts catalog for Suzuki parts. Enter 2003, click on LT50, and select crank. #12, part # 09283-22001 is the oil seal. This parts catalog will give you a good idea of insides of that engine. The only two ways that I can see trans oil getting into the combustion chamber is that seal or a cracked case. By the way, I replaced mine a year ago, no problems since.
http://216.37.204.206/escondido/Suzuki_OEM/SuzukiATV.asp?Type=13&A=109&B=6
Posted by: bruteforcebob
water can come in through vaccume lines, the airbox, leaky carb gaskets, through the exaust its pretty easy to do.
Posted by: mikulskn
I have an '03 KFX50. It just started smoking terribly, oil leaking where exhaust mates to exhaust port, and no power. Is this carb problem?
Posted by: mikulskn
Thanks. I will give it a try to see if I can detect the a leak in the head gasket. Just fyi-it went bad after my boy spent a lot of time in deep mud and standing water.
Posted by: mikulskn
Head gasket and cylinder gasket look perfect! Could it be rings? There are not a tremendous amount of hours on this atv. Could dirt during recent mudding gotten into cylinder and blown the rings?
Posted by: mikulskn
Yes, it runs but no power, hard to keep it going, and lot of smoke out exhaust. It seem there is just too much oil in crankcase/cylinder and excess is coming out at cylinder connector to exhaust. Could it be bad oil pump?
Posted by: mikulskn
Great thought!!!!! That is a good bet that their was a water fill. I will drain and refill tomorrow. Relative to the oil pump, I see on that diagrams on Kawasaki.com that there is a cam (not oil pump) to allow the 2-cycle oil to enter the crankcase. Thanks!
Posted by: mikulskn
I cleaned the air filter earlier today since I took the carb all apart and cleaned it. It ran exactly the same after the carb/filter cleaning. By the way, how can water get in the case? I will let you know on the results of the tasks tomorrow!!!
Posted by: mikulskn
Well I drained the oil in the transmission tonight. I could not find somewhere to drain any residual liquid in the crank portion of the crankcase. I started it and it exhibited the same problems. Any suggestions on making sure there are no fluids in the crankcase?
Posted by: mikulskn
Well I took off exhaust, remove spark plug, and removed carb. Turned it upside down. Nothing came out. But when I pull on starter rope, oil comes out. When I make several pulls on starter rope, more oil comes out. It has to be oil from transmission or injection oil. Can oil get from transmission to crank? If it is injection oil, must be bad oil cam/pump. I pulled cover off the oil pump. When I pull starter, I expected cam to turn but it doesn't. I don't have a clue how to get cam assembly out of hole to inspect. Any hints on what exact problem is or how to troubleshoot oil pump?
Posted by: mikulskn
I think you may be right on with the seal leaking trans oil over to crank side. The smoke smells a lot different than excess 2-cycle oil burning smell. Are you talking about the seal that goes right down the middle of the crankcase from front to back? Are your lt50, how were you able to know for sure this was the problem? Was it obvious after you split it apart? Thanks.
