Can a carburetor cause an knock

JMcTurnan · Post by **JMcTurnan** » Mon May 11, 2009 9:16 pm

So I got this junk yard carburetor, I got it running. And it ran for a bit then the carburetor [censored] up, its a hunk of junk. But anyways since I've had it my engine seems to be knocking, but sometimes when it warms up and the carb seems steady it quits. Can a carb running rough cause a knock? I really violent one? Or am I in the whole with a broken piston rod? I hope not, its a new engine.

fireguywtc · Post by **fireguywtc** » Mon May 11, 2009 9:32 pm

I dont think a carb can cause a knock noise itself, theres nothing in there moving like in the engine that would make noise. Even if there were some kind of noise from it, I would think it would be when you move the throttle and it wouldn't be very loud.

You will have to do some more investigating to see were the knock is coming from. Did you clean the carb or go through it before you installed it? You may have sucked something into the engine and cause damage if you didn't. Is the knock a constant noise or intermittent?

JMcTurnan · Post by **JMcTurnan** » Mon May 11, 2009 9:41 pm

It stops when you push on the throttle, its really hard to tell where its coming from. I did a thorough cleaning, im just hoping it isnt a rod. Im not really sure, I need a new carburetor is what I need. When I get it I will definetly know, but yea it is a possibility, maybe something fell out, God I hope not. Its more of a constant random noise when your off the throttle.

JMcTurnan · Post by **JMcTurnan** » Tue May 12, 2009 3:21 pm

Redcap · Post by **Redcap** » Tue May 12, 2009 4:29 pm

papabug71 · Post by **papabug71** » Tue May 12, 2009 7:52 pm

Knock is caused by timing/ignition issues or bad fuel. It almost sounds like its out of time.

Or it could be fixin' to swarm on ya.

JMcTurnan · Post by **JMcTurnan** » Wed May 13, 2009 2:10 am

Well I put it in time and it sounded really nice, and the knock stopped. But than the next time I started it had gotten worse. So I'm not sure, someone told me if the air and fuel ratior and the carburetor isn't spreading right than it causes combustion before it gets to the piston. Does this sound right to any of you? But true, it never started untill I put the new electronic ignition on, also never happened till I put this carburetor on.

sideoilerfe · Post by **sideoilerfe** » Wed May 13, 2009 2:50 am

JMcTurnan wrote:it never started untill I put the new electronic ignition on, also never happened till I put this carburetor on.

There's your answer. What kind of ignition did you use? Be specific. What kind of carburetor is it? Carburetor's don't knock.

JMcTurnan · Post by **JMcTurnan** » Wed May 13, 2009 5:49 am

Im not sure what type of dizzy, my cousin got it for me for free. The carb is a holly.

Redcap · Post by **Redcap** » Wed May 13, 2009 11:26 am

JMcTurnan wrote:Im not sure what type of dizzy, my cousin got it for me for free. The carb is a holly.

You should probably find out what kind of distributor then.

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