Sparks timing key for the Raptor
#4
I had the local Yamaha dealer put mine in. I know you need a 3 prong puller to get the side open, but other than that i'm not sure. I didn't have to rejet and I am not totally sure about how much it helped because I put on a taller front sprocker at the same time. I also spoke with Sparks and they said there should be no need to rejet.
#5
Gary660r: My advice is DON'T do it. It's a semi-pain-in-the-@ss, and I didn't feel like there were any appreciable benefits. I promptly took mine back out. It may have even initiated (don't ask me how) the famous stalls-on-the-top-end problem that so many of you have read about from me on some of my posts. I was not impressed, and will not do it again on my new Raptor when I get it. Good luck, whatever you end up doing, but I'm not convinced.
#7
I don't know about not getting anything from it on a built engine. I was looking at that Vitos or Vinnies(The guy who builds those special blaster and banshee pistons) website and he had the Horsepower charts on a built engine and he showed before and after charts with his advance key(5 degree) and it showed a strong 2 HP increase. However those are two strokes.
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