Pinch Test and tuning question
Just began breaking in a new LST XXL with the 454 engine, and I read the engine should rev up slightly then die after 3-4 sec. Mine started very rich and would stop at 8-10 sec, so I leaned the LSN until it stops at 3-4 sec. But it seems like the rpm goes even higher and much louder than when it stopped at 8 sec. It pretty much screams but doesn't really engage the clutch yet (maybe a little as I was holding it down). It actually sounds ok and rises just a little when it stopped at 8-10 sec. I pinch the tube about 4 inches from the carb since the filter is in the way, but not sure if that'll affect it? I wasn't able to run the truck at all yet since the pull start's spring broke right after :/ The temp was around 180 F.
Also, how much does the HSN affect the LSN? Heard it leans/richens the low end as well, but is there a general rule like for every full turn of the HSN it'll be like a quarter turn to the LSN?