kevbo's latest activity
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kevbo replied to the thread GP 1100 with 1200 cylinders port matched.The bottom screw feeds the lowest fuel inlet hole. It’s to adjust idle mixture only. Pilot jet feeds the holes just above lowest one, it... -
kevbo replied to the thread GP 1100 with 1200 cylinders port matched.An overly rich part throttle setting will usually help response. Couches spend a lot of time at full throttle so setting the top screws...
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kevbo replied to the thread GP 1100 with 1200 cylinders port matched.The bottom screws are the low idle adjustment only. 1/4 throttle is the pilot jets. Lowering the pop off will do the same as using the...
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kevbo replied to the thread Updated porting temp plate.Open/non-tuned exhausts are not the best application for any jetski since max torque is always around 5000rpm. Our pumps don't make...
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kevbo replied to the thread Updated porting temp plate.One other thing to consider about port height is your exhaust system. Once you go higher than stock 61x timing you also need a working...
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kevbo replied to the thread Blaster 96 WaveBlaster 1 (Redemption).A tiny exhaust leak will make it bogg. Cracking the hood will troubleshoot that.
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kevbo replied to the thread Updated porting temp plate.Low ports will limit power but they are the most responsive. I have found the throttle response gets slow unless you want to set...
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kevbo replied to the thread Blaster 96 WaveBlaster 1 (Redemption).Try cracking the hood and make sure the tank is venting.
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kevbo replied to the thread Best pump for 2023 Yamaha Superjet.Use bearings with a C3 or C4 and make sure they aren't too tight in the housing. If they are overheating then they fit too tight.
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kevbo replied to the thread How to add antifreeze to crankcase?.Dry rev it until the thermosensor starts shutting it down. That will push out all the water. Corrosion is the real problem so use cheap...
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kevbo replied to the thread 65v vs 62t 144 nozzle.An upswept nozzle will make a superjet porpoise. They may be beneficial on a flip ski although it could make boarding a short ski more...
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kevbo replied to the thread PJS Viper9000 super cylinder w/total loss static timing.You need to be careful with timing advance until the main jets/top screws are set rich of peak power. After that it’s safe to use a...
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kevbo replied to the thread SN oem factory build markings.I have a 93 that still has 03/92 hand written inside.
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kevbo replied to the thread What Impeller for Stock Pump with 61x Engine and B-Pipe?.The FX1 was designed in 1991, when 550s with 440 pumps were winning the world finals. These pumps needed to turn over 8000rpm to work...
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kevbo reacted to Big Kahuna's post in the thread What Impeller for Stock Pump with 61x Engine and B-Pipe? with
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Kawi 140mm pump for the win!