Good Morning Jon, et. al.,
On my K5 Literbike I have now, I have yet to add the SS braided lines, and I'll do those pads mentioned while I'm at it. For me, it still stops well so I'm not in a big hurry. The K5 LIterbike I just sold had some Vesrah SS lines that I added.
ON the one I have now- I have had the ECU flashed via the mail to Dallas.
I have the K&N air cleaner also. I have had it dynoed, and it had a nice steady power curve and torque curve, with a good a/f ratio also.
The dyno-er said he really liked the way the graph looked and said I should be real happy with it. He said it looked like a flashed ecu too.
It was in the 90'sF in his dyno room, kinda humid, and I was running off the 10% ethanol Premium. IIRC- it made 158 RW HP
I was hoping for a bit more.
He said with no ethanol premium and a cooler dryer day- I would have been in the 160's, 170's, at the RW. For basically a stock engine- still not bad.
I asked since he felt my a/f was good all the way thru, if I needed or should get a PC V. He stated that he didn't feel I needed it and wouldn't recommend it for my bike at the time. And yes, he does use them on some of his personal bikes, and does do dyno tunes with his dyno and PC's.
I have done the 520 Driven conversion on this one too. Not really sure why, other than it needed a new chain, and I did the sprockets too.
I also did a -1,+1. ** But, I have also gone with a Dunlop Q3+ 190/55.
The 55 rear profile is like taking away ~1-2 tooth on the rear.- Longer gearing.
So the -1, +1 makes it just slightly shorter than the stock ratio set up, w/ the 55 rear profile tire.
IMHO, I would not make my gearing longer as you stated- JMO though.
Having the 520 with aluminum rear sprocket on my bike now. ( I think the Blue colored rear sprocket does add 10 HP though
), I wouldn't really recommend it.
I didn't need the PAIR valve mod since they disabled it on my flash. Supposed to add 1-2 RWHP.
I don't have the SET exhaust valve either, and K5 didn't have a Cat.
I have a Yoshi full carbon exhaust slip on a Ti midpipe, stock Ti header.
Without doing some internal stuff to the motor, cams, porting, milling head, etc.
Hard to squeeze much more out of a stock motor, that already is so efficiently powerful.
YMMV, good day to all, I hope any of that helped,