There are a few startup knocking / clanking threads but none of them sound quite like mine.
1982 KZ 440 LTD Belt Drive
When I start up cold, I need full choke for about a minute (~5k RPM), then half choke for another minute or so (~2k to 3k RPM), then it will idle without shutting off.
While on full choke / first minute, it makes some weir noises:
- Periodic clanking, like a "clack... clack clack... clack..."
- There is also a sort of knock that happens that is difficult to describe. Infrequent and usually has a slight dip in RPM after.
- The right side exhaust is somewhat irregular and makes a popping noise, almost like a crackle. Similar to a back fire but less loud and more sporadic.
During the second minute, if I do not use half choke, it will struggle to keep going. If I put in a little bit of throttle and get it up to ~2k RPM, it will struggle and have frequent dips in RPM / often shut off.
After about 2 minutes of this fairly rough warm up, it gets a little better. And after about 4 minutes in the thing runs and sounds just fine.
I took some videos of it this morning and will upload them to youtube later.
Any help, ideas, suggestions etc. would be great!