I recently put a zex system in my S2, currently I have the 55 jet installed. It feels like it gave me about 25-30hp, I'm using a bottle heater and even warming it up for a half an hour or so. There is a strait in my neighborhood where I would normally reach 80mph. With the nos I hit about 85mph or less. Does this sound about right?

I would like to put an 75-100 shot, but I can't seem to find a cheap way to retard the timing. What would be the best way to do this including an in the tank high volume fuel pump? Keep in mind this is a lease; what ever I do know I need to be able remove easily.



Does anyone out there know of a specific product ment for the S2 or works for the S2 to retard the timing. I don't want to spend a lot, under $500. is what I'm looking for.

Do I need to run after market spark plugs w/ my current 55 shot of n20?

Thanks for the help everyone!