Originally Posted by
Rick57
Hi Monty,
I need your help. I am confused on the correct HSN setting for my Plus-21C. If you go to the Novarossi web site and watch the video clip of Adam Drake on tuning he states that a good starting point for a “race tune” for the HSN on the Plus 21 is “flush to a 1/4 to ½ turn in. If you use the “factory setting “ of 3.5 turns out as a base line, it is a long way from flush! Is a “race tune” that far from the “factory setting” of 3.5? Every time I try to lean out the HSN that much, the temps shoot up. I have never gotten close to a HSN of flush. Granted, the engine is still fairly new. Maybe close to 2 gallons at the most. There is still a slight mechanical pinch. I use Byron’s 25%, O’Donnell T98 plug, and a 6.5 card insert. You thoughts would be appreciated! Maybe I am just over analyzing things!
In case he doesn't get back to you soon enough. The 3 turn ect is from bottomed out gently. Flush is in reference to face of the needle body. Get familiar with the way they look when you get tuned anyway "hard to remember an hour here hour there that way you don't get too far out of wack" . I did my LSN with the carb full open that #s in same post or right there after. Monty's #s get you real close. I couldn't get our new plus 21c motors tuned until I used OD 97T plugs. Wasted alot of time ,I could of been playing .They are priced great right now.