PMS Adjustment with MAXAir too far out
So I have a 2008 V-Star 1100 Classic that my son rode for a few years. Just before I got it, he drilled out the exhaust baffles to lower the sound. When I got the bike, it was backfiring on decel fairly bad, so I decided to get into the carbs and see what I could do. Since then, I've had the carbs out twice, maybe 3 times, and tried a set of Baron's needles to no avail. I ended up putting the original needles back in, but while the carbs were out I drilled out the PMS plugs and installed a set of MaxAir PMS screws so that I Could make adjustments easier. I couldn't find a photo of the MaxAir PMS screws on line anymore, but I found something very similar made by Baron and will try to post a photo here. I set the new PMS screws to 3 turns out as a starting point, but the bike would barely idle and just touching the throttle would casuse it to bog-down and stall it out. So I started to adjust the PMS screws out and eventually got the bike to idle, then tweaked the PMS screws out some more at idle to improve the idle. It was a couple more turns out and the idle really picked up and smoothed out. So these PMS screws are now sitting 4.5 and 5.0 turns out. I took the bike out for a good long afternoon ride, it ran well - for a while - then started having trouble maintaining an idle. When I got back I found that one of the PMS screws had vibrated loose and fell out - I am thinking that at 5 turns out, there just isn't enough spring force on the PMS screw to hold in place and it vibrates out. I found it just sitting in the V. I put it back in and decided to retest the PMS settings, again tweaking them out to get to the smoothest idle and again was back to 4.5 / 5.0 turns. So, I am thinking i have to make another change, either with another set of PMS screws that won't need so many turns out to get to a good idle fuel mixture or with the main needles. Anyone else have experience with these MaxAir PMS ? Everywhere I read says 3.0 - 3.5 turns should be close to the sweet spot. 4.5/5.0 turns is way out there. Should I try another brand of PMS? Should I make an adjustment to the stock jets to allow more fuel at zero throttle (idle)?
First photo is the stock needle set up that is in the carbs now.
2nd Photo is of the Baron PMS screws that are very similar to the MaxAir screws
Thanks for reading...