Originally Posted by
Toiffel
Broke in my new .21 Tuned, did the heat cycle, now here comes the fun part, was trying to get it tuned, and ran into my first problem, when going to full throttle I get this bog (for lack of another name) the engines sounds like a deep "BOAAAAAAAAAAAAAA" then a couple of seconds later clears out, tried leaning the bottom, richening the bottom, leaning the top, richening the top and nothing....any ideas, I'm going back to stock settings, but I'm kind of lost on how to tune, I've read that you first set the LSN then the HSN so it just clears out, spoke with some other guys that run same engine and told me to tune like any other, first HSN then LSN.....any help much appreciated!!!!
With this engine when in doubt lean it out. I had one GRP that sounded lean at idle and sounded like a lean bog at full throttle like you are describing and I leaned it out a lot like 1/2 turn on top and bottom and then all of a sudden it came alive. Tunning on this engine is different from most. So I lean it out till I know its lean and then richen it back up. The last GRP I ordered from powerhouseperformance and I had powerhouse do the heat cycle. This was done in NY at 20 degree ambient temps. When I got the engine I tuned it in 60 degree ambient temp and I had to lean it out a good 1/2 to 3/4 turn on the bottom and 1/4 on the top. Ran like a champ then. Try leaning it till you know its lean and then richen it back up. If you get lost you can always start over at factory settings. Dont give up you will get it and when you do you will be very happy.