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have a 1993 trophy installed a new engine last year and worked…

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have a 1993 trophy installed...
have a 1993 trophy installed a new engine last year and worked great,this year i can only get 4200 rps wide open.runs smooth going accross the lake has a surging at lower rpms all new fuel with lots of sea foam,new fuel filter,took carb and had it rebuilt,installed new coil but still cannot get over 4200 rpms last year i ran up to 5200 rpm no problem 4.3 ltr alpha 1 help
Submitted: 8 years ago.Category: Boat
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Answered in 1 hour by:
6/22/2010
Marine Mechanic: Jeremy R., MarineTechnician replied 8 years ago
Jeremy R.
Jeremy R., MarineTechnician
Category: Boat
Satisfied Customers: 9,020
Experience: Multiple factory certifications 20+ years of experience.
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Welcome do you have a serial number of motor?
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Customer reply replied 8 years ago
i do not have number,boat is at the lake.installed a new long block last year.ran great until i took out of storage this spring.
Marine Mechanic: Tan, MerCruiser Certified Technician replied 8 years ago
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,420
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
Verified
Check your anti-siphon on the fuel tank. Follow your fuel supply back to the fuel tank remove the fuel hose remove the fitting the hose was connected to check for debris and the check ball to see that it moves freely, if ok remove the pick up tube check the screen for debris or do this test. Here is a diagram of the fuel system.graphic
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Marine Mechanic: Jeremy R., MarineTechnician replied 8 years ago
still need help with this?
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