Found an old 200s in a garage that hasn’t been used in 2 years, we pulled it out and checked the spark and put some new gas in it and eventually it started but didn’t have time to run it properly, the next day it just wouldn’t pull start, the only way I could get it running was by crash starting it down a hill, it runs awesome once it’s going and so I warmed it up but still no pull start, so I went and brought a brand new spark plug and some engine start and sprayed that in the air intake…still no luck…so I pulled the carby off and cleaned the inside out and sprayed cleaner through the jets, after putting it back together boom! It started perfectly twice! But then 4hrs later I tried to start it again and no longer would it start, played around with it for ages pulled it probably 20 times atleast…compression is good, spark is good, air intake seems fine, has plenty of gas, what else could it be??

Thanks for any help