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21 October 2013, 18:13
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#1
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Member
Country: UK - England
Town: Bromsgrove
Boat name: Kick-Ass !
Make: PAC/Artic 22
Length: 6m +
Engine: 250hp Yamaha
Join Date: Nov 2003
Posts: 3,572
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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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MY BIGGEST WORRY IS THAT MY WIFE(WHEN I"M DEAD)WILL SELL MY TOY'S FOR WHAT I SAID I PAID FOR THEM.
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21 October 2013, 18:40
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#2
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Member
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 70hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 4,534
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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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Is that with or without VAT?
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21 October 2013, 18:49
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#3
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Member
Country: UK - England
Town: Chorley / Holyhead
Boat name: Northwind Challenger
Make: Tornado
Length: 6m +
Engine: Mariner 115 efi CT
MMSI: 235080598
Join Date: Jun 2011
Posts: 1,411
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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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"Life may often suck, but the alternative is unacceptable"
MMSI Sticker
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21 October 2013, 18:52
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#4
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Member
Country: UK - England
Town: Bromsgrove
Boat name: Kick-Ass !
Make: PAC/Artic 22
Length: 6m +
Engine: 250hp Yamaha
Join Date: Nov 2003
Posts: 3,572
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Quote:
Originally Posted by spartacus
What's the fuel, regular 95 octane unleaded? Are the sparks oil-fouled or look just fine?
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Regular fuel but allways has run on it
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MY BIGGEST WORRY IS THAT MY WIFE(WHEN I"M DEAD)WILL SELL MY TOY'S FOR WHAT I SAID I PAID FOR THEM.
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21 October 2013, 18:55
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#5
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Member
Country: UK - England
Town: Bromsgrove
Boat name: Kick-Ass !
Make: PAC/Artic 22
Length: 6m +
Engine: 250hp Yamaha
Join Date: Nov 2003
Posts: 3,572
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Quote:
Originally Posted by Festinghouse
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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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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MY BIGGEST WORRY IS THAT MY WIFE(WHEN I"M DEAD)WILL SELL MY TOY'S FOR WHAT I SAID I PAID FOR THEM.
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21 October 2013, 18:57
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#6
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Member
Country: UK - England
Town: Bromsgrove
Boat name: Kick-Ass !
Make: PAC/Artic 22
Length: 6m +
Engine: 250hp Yamaha
Join Date: Nov 2003
Posts: 3,572
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Quote:
Originally Posted by Festinghouse
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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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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MY BIGGEST WORRY IS THAT MY WIFE(WHEN I"M DEAD)WILL SELL MY TOY'S FOR WHAT I SAID I PAID FOR THEM.
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21 October 2013, 20:33
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#7
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Member
Country: UK - England
Town: Chorley / Holyhead
Boat name: Northwind Challenger
Make: Tornado
Length: 6m +
Engine: Mariner 115 efi CT
MMSI: 235080598
Join Date: Jun 2011
Posts: 1,411
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what engine is this? does it accelerate smoothly, or does it falter and miss?
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"Life may often suck, but the alternative is unacceptable"
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21 October 2013, 20:58
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#8
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Member
Country: UK - England
Town: Bromsgrove
Boat name: Kick-Ass !
Make: PAC/Artic 22
Length: 6m +
Engine: 250hp Yamaha
Join Date: Nov 2003
Posts: 3,572
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Quote:
Originally Posted by Festinghouse
what engine is this? does it accelerate smoothly, or does it falter and miss?
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94 merc 200 offshore runs fine but does not top,out ,,, asif cable is set wrong really is strange
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MY BIGGEST WORRY IS THAT MY WIFE(WHEN I"M DEAD)WILL SELL MY TOY'S FOR WHAT I SAID I PAID FOR THEM.
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21 October 2013, 21:06
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#9
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Member
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 919
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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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fun on a boat is inversely proportional to size...sort of anyway
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21 October 2013, 21:13
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#10
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Member
Country: UK - England
Town: Chorley / Holyhead
Boat name: Northwind Challenger
Make: Tornado
Length: 6m +
Engine: Mariner 115 efi CT
MMSI: 235080598
Join Date: Jun 2011
Posts: 1,411
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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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"Life may often suck, but the alternative is unacceptable"
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22 October 2013, 05:17
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#11
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Member
Country: UK - England
Town: Bromsgrove
Boat name: Kick-Ass !
Make: PAC/Artic 22
Length: 6m +
Engine: 250hp Yamaha
Join Date: Nov 2003
Posts: 3,572
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Quote:
Originally Posted by Festinghouse
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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All after market black boxes was professionally set up originally
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MY BIGGEST WORRY IS THAT MY WIFE(WHEN I"M DEAD)WILL SELL MY TOY'S FOR WHAT I SAID I PAID FOR THEM.
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23 October 2013, 22:14
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#12
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Member
Join Date: Mar 2013
Posts: 5
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If it's down by nearly 1000 rpm and you didn't do anything to the engine, then I'd check all cylinders to make sure they're all firing.
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11 November 2013, 09:19
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#13
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Member
Country: UK - England
Town: Bromsgrove
Boat name: Kick-Ass !
Make: PAC/Artic 22
Length: 6m +
Engine: 250hp Yamaha
Join Date: Nov 2003
Posts: 3,572
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Finally
Would you beleive it,,, plug caps
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MY BIGGEST WORRY IS THAT MY WIFE(WHEN I"M DEAD)WILL SELL MY TOY'S FOR WHAT I SAID I PAID FOR THEM.
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11 November 2013, 12:44
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#14
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Member
Country: UK - England
Town: Wild West
Boat name: No Boat
Make: No Boat
Length: under 3m
Join Date: Jan 2008
Posts: 5,304
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Quote:
Originally Posted by nugent
Finally
Would you beleive it,,, plug caps
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 and Yes I would  ..Nice easy fix though Ed,thats the main thing!
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A clever Man learns by his mistakes..
A Wise Man learns by other people's!
The Road to HELL ..is Paved with "Good inventions!"
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11 November 2013, 12:54
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#15
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Member
Country: UK - England
Town: Dorset & Hants
Boat name: Streaker/Orange
Make: Avon/Ribcraft
Length: 4m +
Engine: 50Yam/25 Mariner
Join Date: Apr 2007
Posts: 5,551
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Quote:
Originally Posted by nugent
Finally
Would you beleive it,,, plug caps
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I'd have though they were in a plastic bag  ....... 
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11 November 2013, 12:59
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#16
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Member
Country: UK - England
Town: Southampton
Boat name: SMH Rib / War Shot
Make: Ribtec / Scorpion
Length: 4m +
Engine: 100hp Yam/150hp opt
Join Date: Sep 2003
Posts: 2,069
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Plug leads
Had a similar problem with our Opti.
Would drop about 500rpm after 30 seconds at WOT.
Really stumped the engineers. Injectors? Air injectors? Fuel filters? Fuel pumps? ECU?
Decided to start looking at the cheapest parts first - and thought back to my first car.
One of the plug leads had chafed on the block and as soon as everything got hot must have been shorting / breaking down>
New set of leads and bingo back as she was :-)
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Sula
Northwind Challenger
War Shot
