So yesterday I had my PV out several times. In the morning I had some higher idle which I had attributed to cold weather coming on and need to adjust the clutch cable (drags the RPM up a bit while slowing down, etc.). I did cut my idle air down when I stopped to park - a bit too much as I learned when I went to restart it and it wouldn't run. So I raised it back up until it was able to idle, no problem. On the way to my gym up a huge incline, I usually barrel up in 4th WOT with no issues. But this time I had it bog down after a bit and lose power. There was no high temps or anything (340F / 170C on the stud mounted CHT). I clutched it and blipped the throttle, no problem, it kept running. This happened a couple times then it was squared away after I pulled over and gave it a second. So I got to thinking about air leaks.
Before I left to go home I threw in a new plug and it rode home fine no issues. Idles were decent, no racing RPM, power was good, temps normal for this bike.
At home I let the engine down for a look for leaks.
-Carb is Polini CP21 direct mount to the manifold, was tight and no sign of leaks.
-No sign of leaks at intake manifold and nuts tight
-No sign of leaks at exhaust manifold and nuts tight
-No sign of leaks at head to barrel and nuts tight
Anything else I should be checking? I'm wondering if I just had some crap in the carb as the bike had sat for 3-4 weeks, and we have that oh so lovely ethanol in our gas.
Thanks for any ideas. I'd rather check it all before sending it back out into the wild again. I did clean up my engine and adjust my cables well while doing my inspection.
This carb does have massive spitback, and I'm wondering if the soaked air filter might also play in.
Last edited by sdjohn on Sat Apr 14, 2018 6:22 pm; edited 1 time in total