Rian_Colorado
09-08-2025, 12:13 PM
https://www.youtube.com/shorts/M4-hJTo9YUI
So after my big win with the Hydro-boost solve, I was very pleased with myself, and took the now fully functional go cart for a quick trip around the block. Huge smile.... until I started getting some backfires, and then this very unpleasant sound. I quickly put the go-cart back in the shop and shut it off.....
In the clip, I have disconnected the primary to the distributer, so no spark (hence no start) to try and diagnose what the hell this sound is. (that "tick tick" metal on metal sound in the last few seconds of the video)
Motor never got over 2500ish RPM, so I don't think this is a rod or any other internal. My thoughts are a cam lobe smacking a tappet? or probably more likely a valve head contacting the cylinder head.... I've been depressed for 3 days, but it's time to move on to the "find a solution" phase....
I've done nothing to the motor beyond picking it up and placing it in the car (and installing exhaust / electrical etc.) I opened the pro-flow 4 software to connect to it, but just looked around to get a feel - no changing any parameters etc. The motor was built by a pro, and dyno tested for an hour or so, then sent to me. I've had it on and running in the shop for maybe 10-12 total minutes since first start. I HAVE to think it was all good when I got it, but I'm racking my brain trying to think of something I've touched that would have caused whatever this is.
My guess is that it's some kind of timing issue? Some slight or slowly moving timing degradation? Hopefully not a timing chain tooth skip or something? I've never set timing, or really messed with a distributer before - so I'm fully clueless and in full learning mode if that is indeed the issue...
Any thoughts or opinions on what this is/could be? how to test, or better yet remedy the situation?
Help..... https://thefactoryfiveforum.com/images/icons/icon9.png
Rian
So after my big win with the Hydro-boost solve, I was very pleased with myself, and took the now fully functional go cart for a quick trip around the block. Huge smile.... until I started getting some backfires, and then this very unpleasant sound. I quickly put the go-cart back in the shop and shut it off.....
In the clip, I have disconnected the primary to the distributer, so no spark (hence no start) to try and diagnose what the hell this sound is. (that "tick tick" metal on metal sound in the last few seconds of the video)
Motor never got over 2500ish RPM, so I don't think this is a rod or any other internal. My thoughts are a cam lobe smacking a tappet? or probably more likely a valve head contacting the cylinder head.... I've been depressed for 3 days, but it's time to move on to the "find a solution" phase....
I've done nothing to the motor beyond picking it up and placing it in the car (and installing exhaust / electrical etc.) I opened the pro-flow 4 software to connect to it, but just looked around to get a feel - no changing any parameters etc. The motor was built by a pro, and dyno tested for an hour or so, then sent to me. I've had it on and running in the shop for maybe 10-12 total minutes since first start. I HAVE to think it was all good when I got it, but I'm racking my brain trying to think of something I've touched that would have caused whatever this is.
My guess is that it's some kind of timing issue? Some slight or slowly moving timing degradation? Hopefully not a timing chain tooth skip or something? I've never set timing, or really messed with a distributer before - so I'm fully clueless and in full learning mode if that is indeed the issue...
Any thoughts or opinions on what this is/could be? how to test, or better yet remedy the situation?
Help..... https://thefactoryfiveforum.com/images/icons/icon9.png
Rian