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  1. 92 spectrum 150

    Optimal RPM range 150 GT

    What's the recommended RPM range for my 1990 150 GT? Currently on 15x17 aluminum stock prop spinning at about 5200 rpm. With my OMC 14.5x19 SS I'm at about 4900-5000. I'm looking for top speed performance. Hoping to reach close to 50 mph. With the SS OMC, I'm able to top out at about 45 mph @...
  2. 92 spectrum 150

    150 GT rpm issues

    Some weird rpm issues with my motor. I have a 1990 150 GT J150STLESB. I just recently just had my rectifier replace due to jumping rpm's and not charging. After the shop replace the rectifier, the rpm doesn't jump anymore but here's my issue; RPM will run normal up to about 5,000 on fully trim...
  3. 92 spectrum 150

    Fuel leaking, misfiring and exhaust leak. Please help

    I'll explain my problems the best I can one by one. I'm still new at this so bare with me 1. I'm leaking fuel from my vro unit. I've attached a picture for reference. From the picture, it's leaking from the top where the philips screws are mounted to the unit. I'm not sure if there's a gasket...
  4. 92 spectrum 150

    Johnson 150 GT prop

    Hello. I currently have a 1990 150 GT with a 15x19p. Current specs are; Spectrum 17.5 aluminum full counsel boat, WOT 5250-5300 and tops out at 48 so far before hitting a damn tire on the river. I'm looking to do a laser 2 with a 22p, will this help increase speed? I'm looking for top end speed...
  5. 92 spectrum 150

    1990 150 Johnson GT jumping rpm

    Alright guys, I just bought this 1990 150 GT and after installing it, I took her out for a test run and my tach reads fine till I full throttle. As soon as I full throttle, the rpm will go up to about 5250 and then starts jumping around. Sometimes it'll hold at 5250-5300 for a few seconds and...
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