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I have been trying for some time to figure out why my 86 VR doesnt get the mileage some on here claim. Mine, ever since installing the 89 motor (and even with the original 86 motor) struggles to get just slightly over 30 mpg. In addition, the bike has always seemed not to have the umph at higher rpms. My old 88 ran like a scalded dog all the way up to redline. And I have done about all one can do, carbs, sync, plugs, wires, caps, compression is great, valves are right on, no vacuum leaks etc. Well, after reading another thread earlier this week about boost sensors, today I pulled the b/s vacuum line from the manifold, applied vacuum with a mity vac and it would hold nada, nil, ziltch. I had no choice but to pull the necessary stuff to completely remove the rubber vacuum line to check it out and it is just fine; no cracks, plastic connector or balancer, whatever that little gray plastic piece is called is just fine as well. Applied vacuum to just the hose and it holds vacuum just fine. I then pulled the b/s and tried applying vacuum direct to the sensor and you can suck air through it like a straw. That is the culprit in my mileage issue and can't help but call it the culprit in the lack of high end performance. So, does anyone have a good one they are willing to part with? If so, please let me know and I will gladly pay your price. There are several on fleabay but no way of knowing they are any better than the one I just removed. Hope this works. Thanks so much Herb