I'm not sure a blade is enough to take down Goku. I mean, he was hit by an ax that was used to chop down trees when he's entering the house from Aru Village (where he encounters Oolong), and it shatters after landing a blow to Goku's head (leaving a bump after that). His tissues are tougher than humans (Bulma says that she could've died if she was there instead of Goku). Only ways to take down Goku was until he's too hungry to fight or if you grabbed his tail that takes away his strength (making him weak and weary), but he'll basically either dodge or disarm Jason's machete or shatter the blade to no use. That's physically. There's also for him being naive, which could get him into trouble if he caught like a "curiosity kills a cat" kind of thing. Speaking of capabilities, I actually collected some feats like before he received Roshi's training (which I include timing from a 100 meter dash). Like he runs at 11.7647 m/s (8.5 seconds from 100 meters), can lift up a Renault 5 Turbo Bulma's on (which makes about 1,018 kg total) and threw it meters away, crushing granite boulders with his bare hands when pulling out of the ground (and picking up Turtle, a loggerhead sea turtle, which I assume he weighs over 450 kg since I think he's big enough to hold up Roshi above water), resisted 3 gunshots from Bulma's pistol (he's slightly hurt and he stated that his body's hard as steel), defeated the Bear Thief with Jan Ken (Rock, Scissors, N' Paper) to the face, breaking 3 bricks with only his index, surviving from Yamcha's Rogafufuken (Wolf Fang Fist) and collisions from 4 stone pillars in rubble while he's hungry, has a sense of smell like a dog, has an advantage in the wilderness due to living in the mountains... All I'm saying is, he may be small, but he's super strong. But I'm sure Jason can be a tough nut to crack due to his immortality and durability. Goku's a prodigy fighter while Jason is an undead psychopath. Do you think it makes sense? Plus, Goku avoids unfair advantages when it comes to fighting, like outside help or by cheating. Until Jason gets rid of his signatuire weapon, then Goku will fight him fairly in hand-to-hand since you took away his Nyoibo (Power Pole). And I think Jason seeks revenge on some troublesome kids who does the partying and drinking booze or does profanity and all that. Not Goku since he's serene and does mostly fighting.
