Is there anyway to check the vacuum switch it has a hose coming from it that goes into the t and continues as part of the fuel system. Any basic things I should know about it or inspect? Just one of those things on the engine over looked time and time again. Also same for the pulse limiter I replaced the one on my 89 some years ago probably didn't need to and I don't want to throw another 50 bucks away. The vacuum switch isn't even available on brp's website at all though I found a few on eBay for a pretty penny. The switch in question is part 10 in the diagram. 