HEY !! Welcome to the H.Q. !! Fresh stock engine is 130-135 , rebuild range is about 100. You're less than 2% difference, 5% is about the limit. They do get harder to start when they start to get tired. Bad reeds , dirty carbs , fouled plugs also make for hard starting. How does it run when you do get it started ? What do your plugs look like ? Only you know how much you've rode in the last two seasons with the ticking and wether it has gotten worse or louder. You somewhat answered your own ? , if it breaks it breaks Long as your not running lean and the noise hasn't been getting worse I'd ride it. JMHO, your results may vary. Have fun, be safe !!