Hi, I have restored a 2000 IS with 27K. The bike ran good before restoration. The runs fine, but does not have the zip it did before. I open the throttle, and it sounds like its trying to go, but does not have pickup. It likes like the timing is retarded. I changed the timing belts, and lined up all the marks. No backfires, run smooth, but no zip. What did I do wrong?
Did you have the tank off?? Maybe kinked line from petcock to carbs?? Stock petcock?? Bad vacuum line from #6 to petcock so not opening fully??