Not sure, but the Ron Woods Racing CDI works great.

 

I believe that the Graydon is about $100.00 more that the RWR. Go with the RWR you wont regret it. Don't worry about it not have a limit, you can tell when to shift just by listening to your motor.

 

i've got the woods on both of mine and they work great, the only rumor i ever heard was you might have to run race gas and that was a bunch of crap. they work real well and you can tell when your engine is on the down curve just ask my wife she knows ,
the price is the best that i have seenalso. gary has one on the way that is ajustable for nos timeing , he can explain that to you. so hold out there may be a bunch of cdi bows that are used for sell.