Engine didn't start - fix.

[Nodroz]

Hello guys,

I had a little problem starting my engine last week. The day before he ran perfectly fine, but suddenly he stopped working. I decided to open the cilinder head and look inside for dust or other bad things.

Here are a few pictures. I also would like to know what caused such a big clumb of oil / gasoline.







Then, after some work, I completely cleaned the cilinder head.



After injecting fuel directly into the compression chamber, the engine started and ran fine.

The only question I have is how this can happen? (The oil/fuel onto the cilinder head.)

Regards,
Nodroz

[klicky96]

2 Cycle? 4 Cycle?

[the-cyborg]

Originally Posted by klicky96

2 Cycle? 4 Cycle?

Clearly a 4 stroke L-head note the intake and exhaust valves.

[bighead]

I seen worse....

[Nodroz]

Yeah, It's not that bad but I'd like to know how this could have happened?

[kendelrk]

rings

[the-cyborg]

Worn piston rings
Scored cylinder wall
Worn valve guide seals (if equipped)

Like bighead said I've seen worse, but since you have it apart I'd hone and mic the cylinder install new appropriate rings, and re-lap the valves.
$20-$30 worth of parts and time will pit it back in action strong as ever.

[Nodroz]

Originally Posted by the-cyborg

Worn piston rings
Scored cylinder wall
Worn valve guide seals (if equipped)

Like bighead said I've seen worse, but since you have it apart I'd hone and mic the cylinder install new appropriate rings, and re-lap the valves.
$20-$30 worth of parts and time will pit it back in action strong as ever.

Thanks for the information!

Do you think it's worth spending money on this old engine, or is it better to buy a new one.

Also, what will happen if I don't replace any parts? Will the engine die after some time?

[Fabroman]

Originally Posted by Nodroz

Do you think it's worth spending money on this old engine, or is it better to buy a new one.

If you can get the parts cheap & easy enough, yes.

Originally Posted by Nodroz

Also, what will happen if I don't replace any parts? Will the engine die after some time?

Eventually. First it will start blowing white smoke from the exhaust, then it will start losing compression &, therefore, power. all this will gradually get worse over time until you go nowhere in a cloud of smoke. How long will that take? Who knows? it could happen in a week, it might take a year; no way to tell...
Better to fix it now before you totally destroy your engine.

[Nodroz]

I've look up through the internet for symptons for a worn piston ring. I've read that blue smoke is a sympton, but I don't have any blue smoke.

Also, are you guys sure that, that dirt spot has been caused by worn piston rings or valves?

Thanks for the information Fabroman.

[Fabroman]

Well, it's definitely oil & the only way oil gets into the combustion chamber is passed the rings or valves.

As bighead & the cyborg said, "I've seen worse". Your problem is in it's very early stages but it will get worse.

The only other possibilities are
1. you're using 2 stroke fuel which has oil in it or
2. you have a crack in the bore... but I doubt it.
Drop the piston down & have a reeeally good look at the bore, post some pics.

[anderkart]

Originally Posted by Nodroz

The only question I have is how this can happen? (The oil/fuel onto the cilinder head.)

Take a look inside your air filter and see if its oil soaked. If it is, that residue is probably just oil that was drawn in from the breather hose connected to the air filter, and maybe some extra gasoline from repeatedly trying to start it with an oil-fouled spark plug.

Lots of karts have problems with the breather hose pumping oil into the air filter, this can be caused from something as simple as an over-filled oil level or even just hitting big bumps or turning a sharp corner.

One easy solution is to disconnect the breather hose from your air filter, plug the port in the filter, and then instal a fuel filter in the end of the breather hose so you wont draw any dirt into your engine.