down on power

[mighty13d]

Well I do have to say that you've covered your bases quite well, but there does seem to be a restriction somewhere. It's sometimes hard to tell if it's fuel, intake or exhaust. A good indicator of a restriction would be if it 'bogs down' when you really get onto the throttle compared to if you slowly roll into it. Don't know if this helps but figured it couldn't hurt to throw in my $.02

[Guest]

The 850Gs have a fuel filter in the petcock assembly. The Alpha Sports fiche for the 1985 550E shows a very similar assembly. Drain the gas tank and pull the petcock, look for a plugged filter, or some other obstruction. You might also change the fuel hoses, and be sure to use fuel hose instead of rubber tubing.

[p_s]

I think I am losing my mind. My first impression when I put in a new air filter yesterday was that it was faster. My second impression is that it is still not as fast as it should be. I just took it out on a long country road and I am really unsure if there is a problem at all. I had the petcock on prime.

I haven't taken apart the carbs or pulled the petcock, but I did drain the bowls, then put the petcock on prime and gas was just pouring out.

I've heard there's a place an hour away that does dyno runs for $60. I might go do that.

[Nessism]

Almost sounds like the spark advance is not working. Do you know anyone that can loan you an ignitor or maybe check timing with a timing light?

[p_s]

Almost sounds like the spark advance is not working. Do you know anyone that can loan you an ignitor or maybe check timing with a timing light?

I used a timing light on #4 and #3 (to get both coils) and the spark did advance from idle to about 3k and then held there. I didn't measure how much.