how to clean the muffler on a 425 magnum what can i put in it to clean it that wont hurt the spark arrestor

 

What problem are you having that makes you think the muffler needs cleaned?

 

it starts to blow black smoke and when i tapped on the muffler it stopped and also it will backfire

 

Does it have a threaded "PLUG" in the muffler???.....Caper.........

 

yes i took it out and a little stuff came out / if its not the muffler any idea waht else it could be

 

Is it backfiring through the carb? Did this start all of a sudden or gradualy get to this point. If it pops through the carb it could be the exhaust lobe on the cam is gone. It could also need a carb rebuild if it's running rich, the popping may be from a fouled plug. Any more info you can give us?

 

it just started all of a sudden but i have been running it for two days now and it hasnt done any more / also what is the ehaust lobe? it didnt do it until i was just running about 5 to 10 mph for about 15 minutes then it started to sputter like it was out of gas then started backfiring and blowing black smoke

 

I would replace the spark plug and have the carb gone through. Sounds like youre running rich and fouled a plug to me.


Check and see if there is a bracket holding the rear of the carburetor that bolts to the frame. There should be a bracket that is screwed to the carb and then goes to the frame and is secured there with what looks like tiny motor mounts. A rubber dampner with a stud threaded into the frame and the other goes through the carb bracket and is held on with washers and nuts. What year is your machine?

 

it is a 1998 425 magnum also now i can smell a little gas in the oil

 

The carb needs to be rebuilt. Did you see the bracket holdint the rear of the carb?