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I know this is strictly a turbo list, but I can't get any help on my other list because no one else is using nitrous, so I'm sorry if it doesn't apply. Here's the history of the bike: Year 1: Stock 1988 Yamaha FJ1200, 1188cc's K&N filters Dynojet stage III kit (I can't remember needle & jet sizes, but it was what the kit recommended) Accel coils Vance & Hines Supersport Kit, Quitech II baffle Factory ignition advancer Bike dyno'd 113 horsepower to the rear wheel, 13, 000 km's on motor, approx 18 degrees Celsius outside Year 2: Same as above, but with nitrous kit, phase II jets bike dyno's 150 horsepower exactly to the rear wheel, approx 30,000 km's on the bike, similar dyno conditions, different dyno - ignition advancer removed permanently Year 3: My darkest hour. Bent valves, scorched pistons, burnt seals, blown clutch at dyno shootout (103 to the rear wheel, 148 with the NOS, phase III jets = approx 50 horse rating), twisted swingarm, chain lets go drag racing big mess etc Year 4: Changes: "streetfighter" polish & port degreed cams/slotted sprockets stainless valves, complete head rebuild - new seats, seals, guides, etc bike bored to 1219cc's, new Wiseco's Dyna coils & Taylor leads Supertrapp Stealth stainless exhaust (I know I know but it was the only complete stainless system for the bike) 14 plates - dyno'd to remove flat spot with V&H pipe - 6 hp gain across midrange phase IV nitrous jets - on paper, 68 bhp gain heavy-duty billet clutch, new chain & sprockets, clutch spring conversion, etc 115 to the rear without the juice, 154 with, 80 pounds torque no sauce, 100 pounds with I have stock carbs, and they're synched yearly. New plugs gapped correctly, etc. The bike runs like a dream. 43,000 km's on the bike, 4500 km's on rebuilt top end. Is this motor maxed-out for what I've done to it? Why is it staying at around the 150 mark? This fall I'm going to either turbo or blower it, but I'm pissed off with these results for this year. Thanks for the help. Jonny Nitrous