Reply to "Holley 650"

Thanks for the link. I know about that one.

The carb was sent back to Holley and they covered the problem under warranty. Their service and support is absolutely amazing!!! What I’m trying to figure out is how I managed to mess it up and apparently I did! Also, why it worked fine for a couple of months and then started having problems. It did start about the time that our hottest weather cooled some. Put my 600 back on and it runs perfectly. Here is what Holly said.

“The air fuel was just out of adjustment this is mainly your throttle plate opening on your transfer slots front to rear where either closed to much or open to much on the primary and secondary's, you have a max of .020 you can expose on the primaries with the plates closed and .015 on the secondary's.”

“As we received the carb it was basically just out of adjustment the Air was 27% lean and the fuel was 30% rich, fast idle was adjusted low the carb was set back to the factory specs and flowed and passed as a good carb.”

“Do you have an aftermarket cam installed? A lot of times this is where these adjustments become a issue and you have to balance the air out between the primary and secondary in order to get a smooth idle with the cam without exposing to much of the transfer slots.”

Mike