1991 S21ZPR F-Series Carb Replacement

hey_ygbsm

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Fellow Lawn Boy Enthusiasts,
I'm the original owner of this 1991 S21ZPR. Have thought about getting a new mower the past 10 years, but, this one just won't die! She's been a workhorse. Anyhow, I'd like to buy a backup, replacement carb. It's been surging a bit. Without pulling the old one off, I can't seem to sleuth the correct Walbro LMR model to purchase. Thought perhaps the forum would know. It's an F-series, 4Hp with choke only, no primer. Hope you can point me to the correct Walbro part number or a Lawn Boy-Walbro cross reference chart. Thanks.
 
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