G-62 4+ gal. with Lawnboy at 32to1, mounted on 80 inch Lanier CAP, turning Zinger 22 6-10. Runs strong NEVER quits. Idle set first and takes power smoothly. No problems until instalation of velocity stack. Reset using tach, peaked at 7300 and backed down to 7200 and took off. almost immediately went extremely rich. Entered the pattern and it quit on final. Checked plug and it was wet so leaned out 1/8 and tried again. Same result, died on final. Turned stack every direction made no difference. Took stack off reset everything and all back to normal. Not that big a deal, just tiring to get a little better gas mileage. I am puzzled because all other G-62s around (stack exposed to the air stream and not exposed) run great with the stack. I've been doing this for a long time and I can't figure this one out! Thanks, Skip

Check this thread out.
http://www.rcuniverse.com/showthread...113&forumid=37

Adamm

Thanks, I just saw it, Skip

There is nothing magic about a velocity stack..An engine requires a set amount of fuel and air
to run..Nothing will change this..A velocity stack sometimes helps fuel economy by keeping fuel from being sucked out of the carb..The fuel mixture stays the same, you are just losing less out the carb into the airstream....

You may have pointed the stack into the airflow, don't, you do NOT want ram air. If the velocity stack is inside a cowl, you may have to experiment a bit to get it oriented for best results as the air flow inside the cowl is often not as you expect it to be. If the stack is oriented properly, there should be no change required in needle settings for best results.

Stack protrudes outside the cowl, Skip