K321 won’t rev up

Posted by cody224 on September 01, 2020 at 16:23:56 from (206.198.204.25):

Restoring a k321 and the engine won’t rev up at all. Fresh rebuild new piston rings bored cylinder ground crank new points governor. Seems like it idles ok, I first started it a Walbro carb and idled perfect then, now not so much with the Chinese aftermarket. Tried adjusting jets but makes no difference. Was gonna try putting the walbro back on but I lost one of the jets but should be able to find it. The new fuel pump I found does not work but I have hooked up gravity feed from aux fuel tank. Walbro carb leaks when hooked up to Old fuel pump (I replaced fuel pump and I think I need to purge air out to make work) cleaned Chinese carb twice it had black crap inside before it wouldn’t run at all. Even before I rebuilt it would never rev up unless it got starting fluid. When it does rev, it spits and sputters and blows back out but I set valve lash right but will recheck that. So I’m thinking my issue is maybe a spark issue? I have a m14 engine I can rob the carb off that engine runs flawless so if carb is bad we can figure that out but I’m not sure that’s the case. Will try the Walbro since it worked before. Any help is very appreciated and will update as I find stuff

Replies:

• Re: K321 won’t rev up cody224 18:14:07 09/01/20 (1)
  • Re: K321 won’t rev up David G 18:16:42 09/01/20 (0)
• Re: K321 won’t rev up hanovertom 18:04:33 09/01/20 (0)
• Re: K321 won’t rev up DeltaSteve 17:54:43 09/01/20 (1)
  • Re: K321 won’t rev up Absent Minded Farmer 19:33:17 09/01/20 (0)

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