ORIGINAL: marcelaw
Looking for help with a new uniflow setup on a boat. I'm running a Thunder Tiger Outlaw 7.5 boat, and have noticed leaning toward the end of my runs. In the constant pursuit of perfection, trying the uniflow setup.
Except for leaning toward the end of runs, boat was running pretty good on normal 2-line main tank, with 2oz hopper/header tank tied to muffler pressure. Setup the uniflow last night, and fired it up on stand. Once started, idle is more rough, and when giving it throttle has significant hesitation before RPMs jump up. I think I saw a post saying with uniflow you need to lean the low speed a bit...is that my issue? I'm not a tuning expert, but I would think the hesitation is caused by not enough fuel, so would need to richen low speed?? Thoughts?
If I were to assume that you were not running your fuel supply under muffler pressure before but are now after your modifications that you are rich on the low end and need to lean it out. If your low speed needle controls airflow turn the needle counterclockwise, if it controls fuel flow - clockwise.
Bill