Have you inspected the pump yet? If it still has the old aluminum pump housing, you ought to update it to the plastic pump housing with stainless steel liner. The complete kit is part number 0439140
I hooked muffs up, cranks good, no start ,,appears have good spark, seems like fuel not reaching plugs, there's plenty of good fuel,, even spray in carb does no good, it did get HOT ,, reckon compression check is pertinent advice is always appreciated...
Compression test, 40,40,40,40,, tighten bolts up, 90,90,90,75, and starts quicker than when first got it and didn't have to prime it,,,needs water pump kit,
Pistons and cylinder walls probably do have scaring, but it might finish up this fishin season, then before next season get lil newer 115-125 for it, , it got hot, I expected the coating on every wire to be melted,, sound like bacon sizzling on low heat..