help me, think i killed it.

[mathd]

ok, there we go the bike seem dead. ill explain what went wrong.
i went to trail today, and after i while, i got wide open on it and it started to lack alot of power and it stopped there.

i pulled the plug out and the end of the plug was melted off.
i put a new plug, it dont whant to start at all, even if i try to push start it.. dosent work. it spark but dosent rev then die.
So i pushed it back home for a long 2 hour am half dead right now ****.

think the top end was done or it could be a jetting problem that seized it?

thanks.

 

[slodad]

Does it have fuel? Melted spark plugs are never a good sign. You probably did kill it. You're going to have to pull the top end to see what the damage was.

 

[TRexRacing]

yep pulling the top end is in the future for you.Looks like a dead one from here.As to why it's dead I haven't clue why it melted the plug.That's usually runaway detonation into preignition.Timing is a guess but have you messed with the timing at all?On a bike that old it could be many things.Crank seal leak,intake leak or jetting if you messed with it.

 

[mathd]

it dosent have compression anymore.
am gonna check the top end in the next day. i cant because am sick right now.

it do have fuel in it.

i didnt mess with igniton timing, and i didnt mess with the jetting but the previous owner the last summer told me it was not jetted right.. but it was running fine to me.

today was a bit colder that what i used to ride at and i ran it at 40:1, usually i premix at 32:1 or 35:1. dont know if that could be it.

i will take it apart and see what the damage are and then i try to find what caused it. I wish once apart it will be easy to know what caused it.

the melted spark plug is not a good sign :(

 

[_JOE_]

Sounds to me like it got really hot. Is there coolant in it? Is the water pump working? Radiators smashed?

What prompted the oil ratio change? I doubt that is what caused it but it certainly didn't help.

Once you get the engine rebuilt go up a few sixes on the main and get on the jetting IMMEDIATELY. I would have expected a more dramatic seizure if it was simply too lean, but you need to know for sure that the engine is getting enough lubrication.

 

[mathd]

yeah it got really hot.
actually when ichanged the plug i did notice that the pipe and head was hot more thant it used to be.
there is coolant in it, but i dont know if the waterpump work, or how to test it.

radiator arent smashed, not more thant they was the previous summer where it worked well.

i changed oil ratio because i use ipone and on the bottle it is write to use 50:1, so i trough i could get it to 40:1 could be great. There is a little bit of oil at the end of the silencer, i can tell it was lubricated enough this way?

i started to take it apart tonight and when i remove the airbox from the carb i did notice that the screw holding the clamp was loose. could this cause an air leak bad enough to do that?

thanks you for the help :)

 

[_JOE_]

Who knows? I can't tell from here. At this point you might as well tear it down and start a close inspection of everything.

What is "ipone" oil?

 

[_JOE_]

As for the water pump, a visual inspection of the impeller and drive system will let you know if it's working.

 

[helio lucas]

What is "ipone" oil?

ipone is a european brand of oil... i think is french...
used to be one of the main sponsors of the world supermoto championship...
you guys only follow your own championship!!! :nener: :fft:

as for the bike, the loose clamp let dirt in the carb if it´s the filter side or suck air if it´s on the engine side... either, is not good!
keep in mind that some oils are not compatible.
colder weather demands more gas (not oil), together with a dirt carb or air leak in a long, wide open throttle straight is enough to do that.

 

[mathd]

ipone oil image
i dont know if it is french or euro really, i use that because its what the previous owner was using and the shop said it was the best oil around. am not french but french canadian.. from quebec.

I will tear down the water pump and check at it like said.
I will also tear down the carb to clean/inspect it and ill make sure the filter side clamp are not loose when i put it back together.

Thanks you again :)

 

[mathd]

ok, i checked the water pump, and it is good.
the piston is melted on the exhaust side so i guess it was too lean/air leak?

i guess it is the carb or the left side crank seal.
i checked it the carb and the main jet is 10 size bigger that factory.
needle is set on the rich side too.

Is there any cheap/at home way to tell if the crank seal is leaking?

 

[helio lucas]

yes... pull the magneto and stator and see if it´s leaking... you will need a magneto puller for the job, but it is quite cheap and will work on a lot of bikes.
a service manual will be great.
check the packing in the silencer also, too much back pressure can cause a lot of heat in the piston.
good luck