I've got a really weak spark (compared to my 450 EXC). The service guys I've talked to say the "pulse generator?" will either work or it wont. I've played with it for a while put it down now I'm back. Thanks for the help with the vacume line fit right under the tank in the rubber isolator < I'm blind. It will start and run < shortly) on ethier, The carbs been cleaned professionaly and I talked with the guy that did it explained to him what the situation was <when I did get it started before I could putt on it till about 2000rpm< guess)then it starved for fuel. Went through the carb again and all I can blame it on is the weak spark < not the bright blue/white I'm used to. Can some one give me idea for what to try next. Honda who wants about 100-150 just to look at it says if it sparks at all it will run. If the advice is to go through the carb again I'll do it but I don't think that's it. < But what do I know Thanks in advance.