My '09 SERG is a bone stock 110" with just a TTS Mastertune from Steve for 2" Fullsac baffles. I have 2.5" Fullsac now, but did not "seem" to lose anything in switching from 2" to 2.5". I sure I did, but my seat of the pants dyno does not feel it. I still get 45 to 47 mpg with just the two of us without the trailer.
I also swapped out the 32t main front drive sprocket to a 30t. I did the rear swingarm elongation mod to the axle slot with welded reinforcements. This is probably the BEST mod I've done to the bike.
My only reason for asking about the springs in conjunction with a lifter change out was simple, why do just lifters if the main reason they fail is to high of valve seat spring pressure. Again I'm not ruling out crappy lifters from the MOCO, just a general statement.
I can pressurize the cylinders and pop the springs without pulling the heads, but I guess if I'm that far into it, pulling the heads and replacing head gaskets would be a good thing to do.
But when you relieve head bolt torque, do I need to go further and replace the base gaskets/O-rings?
Not sure how much more info I can offer. 20k miles, normal oil changes/filters etc, no burnouts or wheelies etc.
So you're recommending bee hive springs? Like I said in the auto genre, they seem tp be a more popular upgrade.
I'm just thinking that if with a stock SE255, an upgrade to a slightly hotter cam that can function on stock compression would be a good thing to invest in. I've also read here, but cannot remember, which cams work well AND do not add to the valve train noise. Like ramp speeds too excessive etc.
Thanks again for the advice and suggestions.