Somebody's had to have seen this before,, anyone?

 

I didn't do one because I first thought the crank was bad and I'd see obvious damage when I took it apart, I have a hot rods crank and bottom end rebuild kit on order, I just hope it fixes the problem

 

Did the new crank take care of the noise

 

Likely piston/wristpin noise. Pull valve cover and crank it over, make sure no sludge is blocking pushrod/rocker passages.

 

I'm probably wrong but it sounds normal in both videos, the second one sounds like normal clutch lash.

I would have taken the clutch off and ran it before I tore it down.

 

So I got the new hotrods crank installed and have the motor back together and started it up and still have the noise. I know alot of people are gonna tell me that the noise is normal, but I bought this thing new 3 years ago and one day it sounded fine, the next it sounded like it wanted to explode, It is not normal. Now Im probably gonna have to rebuild the top end? The rings and cylinders looked good when I had it apart, the tops of the pistons and valves were pretty black and corroded. I'm gonna put my wheels on tomorrow and run it to check if Ive lost power, Ill post again tomorrow. Until then Im open to suggestions. Ive read alot of threads that sounds like the same issue I have but seems like alot of people dont really follow up after the problem is fixed. It sounds the same with the clutch off too

 

make us a video without clutch on and rev it up just like first one.

I relistened and it sounds normal

 

So with the new crank everything is good!

 

So, what did you conclude? Bad main-bearing on the crank? Glad you got it fixed!

Cheers

 

the bearings seemed to be all fine, crank appeared to be fine, so im just guessing that it got hot and slightly bent or out of balance. I really dont know for sure

 

Curious about the cause. The more we can learn from everyone’s experience the better. Can you suspend that crank in a couple of V-blocks and measure the run out? Did you mike all the bearing journals? Can’t argue with success but that engine didn’t sound bad to me but when the cause is not obvious I usually run them till they break and then I know what it was. Last causality resulted in a transmission with a hole in the side of the case, found the noise; a bolt head rattling around and finally found its way out!

 

Did you get it fix , I think it's your primary clucth buttons are bad order a new set before you take your motor apart

 

It sounded like it was still bad until put everything completely back together, like the bed and all the covers. I ran it all weekend with no problems