Serowbot wrote on 08/01/10 at 13:30:02:Give a suck on the vacuum line,... if you get gas,(don't swallow)... the diaphragm is leaky and you need a new petcock,... if you don't get any gas, you need a new hose...
Installed new hose, tried the suck test. No gas. However, it still exhibits the same behavior that ralfyguy demonstrated.
A pinched vacuum hose results in a higher RPM than a free one.
Can someone else try this? I'd prefer to have more than 2 data points before blaming both our petcocks.
Serowbot wrote on 07/28/10 at 20:14:01:To test the main, accelerate from 30 or 40 mph, in 4th or 5th gear at full throttle for several seconds, then reduce throttle by about 1/8,...if power increases for a second, you are lean on the main jet. Go up one jet size and test again.
Tried this again today. I don't have throttle positions marked currently, so I had to guess on the 1/8.
30mph in 4th gear. Man the engine was at a low RPM. I'm usually shifting from 2 to 3 at this point. Slammed open the throttle, engine sounds like a jack hammer. Wait a few seconds (about 10 mph faster) and closed the throttle slightly. The engine sounds got "smoother", there wasn't an obvious change in acceleration.
-D. Dwarf