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Old 21 October 2013, 14:13   #1
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Tuned 200 hp carb motor

Aving some Eire greif


My mildly tuned 200 hp motor is slow


Run it yesterday not right,,, check comp readings 115 to 120. So all is well running prop as always run, but stuck out at 6100 rpm. It used to hit 7k n be safe

Can not see what is a do , any ideas what may be a miss,,,,

Running modified stator and lightened fly wheel carbs where set proffesionaly last year , only thing I have not tried is swapping out the fuel,,,,can the octane rating make this difference,
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Old 21 October 2013, 14:40   #2
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What's the fuel, regular 95 octane unleaded? Are the sparks oil-fouled or look just fine?
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Old 21 October 2013, 14:49   #3
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how have you modified the stator? could the timing stand to be advanced any? are the butterflies on the carbs opening fully?
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Old 21 October 2013, 14:52   #4
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What's the fuel, regular 95 octane unleaded? Are the sparks oil-fouled or look just fine?
Regular fuel but allways has run on it
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Old 21 October 2013, 14:55   #5
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how have you modified the stator? could the timing stand to be advanced any? are the butterflies on the carbs opening fully?
Timing at 24 deg
Stator and flywheel from nick rash/barsh or Some thing thing like that in Cornwall ,
Top range coils black boxes changed to f knows what ,, it normally fly,s to be honest,,, very miffed by it all ,,
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Old 21 October 2013, 14:57   #6
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how have you modified the stator? could the timing stand to be advanced any? are the butterflies on the carbs opening fully?
Cars wide open yes, striped them tonight nothing gummed up, I allwaŷs drain them if left unused for any lengthy time, as I run pre mix on this power head
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Old 21 October 2013, 16:33   #7
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what engine is this? does it accelerate smoothly, or does it falter and miss?
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Old 21 October 2013, 16:58   #8
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what engine is this? does it accelerate smoothly, or does it falter and miss?
94 merc 200 offshore runs fine but does not top,out ,,, asif cable is set wrong really is strange
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Old 21 October 2013, 17:06   #9
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Is there enough fuel for the engine, it needs a lot at 7000....pump giving in or air leak in lines?
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Old 21 October 2013, 17:13   #10
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i know its very frustrating, normally everyone has an idea - usually involving changing expensive items as if theyre nothing! is your engine fitted with a rev limiter? ive no idea how to test one (stators, regulators triggers etc ive done) but could it be worth going along that line? im not sure how they work, but i reckon any fault on the ignition would result in a lumpy engine. is the boat loaded with same weight - your hull isnt full of water is it?!
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