I love this little saw. 45 years old and has been my no3 limbing saw for quite a while. I did a carb adjustment...runs good for a while then starts bogging. Now won't stay runnin and fuel seems to be leaking out the exhaust. Guessing stuck float. But me being much better at cutting and splitting wood than fine engine repair would love to get some advice on my old metal saw. Is a new carb worth it? How tough to get and install? Thanks all!