I just recently installed a new power valve and assembly on my 1989 YZ 250. Before installing I noticed that when I would try to get up and go in 1st and 3rd gears it would bogg down and act really "Jumpy" when I pull down on the Throttle. I took the power valve cover off and noticed it was broken and missing a few parts (Boss Lever, etc.). After installing the new parts and being careful to do it correctly I got the same result.
I'm not too sure where else to look or how else I can really explain what the bike is doing... It starts completely fine and sounds great. It's only when I put the bike in gear and go (in 1st and 3rd gears) that I experience the problem.
Would anyone know what would be my next step? Or where else I would look to get this problem resolved. I'd appreciate any help as I'd like to get my riding season started.
Thanks again,
Robert