***Update****
sorry to bump my own thread, but it kinda went dead while I was too busy to sleep the last week and a half
To recap I the 87 cc in my sig and it is clouding 4 lane highways with black smoke and is gutless. I put "new" injectors in awhile back from a core motor at work that had just had them put in. Then I started running waste trans fluid and was happy with the power (not great but got out of its own way) and fuel mileage. It slowly seemed to lose power over a couple months. I switched back to regular #2 and didnt seem to help. Had the pump rebuilt, didnt improve as much as I had hoped. Just before the pump and with the new pump came the smoke. I messed with the timing and turned the old pump down to no avail.
Last week I cleaned the engine bay and did a full compression test with good results and the week prior did a blow by test with good results. After I cleaned the engine I removed the air filter just to see, that up until today had the biggest impact. Noticeably less smoke (still a lot though) and better power.
Today I turned the pump down three flats, new pump just rebuilt that I simply unpackaged and bolted on. I also reset the timing using my snap on meter and light. Im think the timing is a bit retarded but the power is MUCH more acceptable and the smoke is now a light gray haze at worst (take off, hard accel, and hills). My meter was acting up and was picking up random vibrations. At one point it was telling me the rpm at idle was 2200-3600. I found that it was the same for #1 or #4 injector and that I could get it to read (more) correctly if I put my hand on it gentle to smooth out the excess vibrations. I want to try and time it with a lumi probe and see if I get more accurate results
Im going to try and advance the timing a very small amount and see if I can get the gray haze to go away.
All in all I think the problem was a combination of too much fuel, too far advanced and the 7.3 filter I was running isnt breathing enough.
Im getting closer, little by little but that is kinda the story of my life. Little improvements and progress over time. I took steadily move though and there is somthing to be said for that.
Thanks all,
punk
Let me know if this helps anyone or if anyone has input to further the progress.