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Old 09-05-2005, 10:47 PM   #21
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Dude the size of jets very much depends on the type of carbs you have. Mercury made loads of different carbs and they all have different internal circuits. Therefore different carbs use different size jets for the same results on the same engine. My advice is to ask your engine builder.
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Old 09-05-2005, 11:56 PM   #22
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Go for rich and work down. If you are really stuck, go for so rich it 4 strokes then lean it by about 2 sizes. Slightly rich gives you about the same power as spot on because of the cooling effect of the extra fuel on the charge. Too lean you seem to already know about.
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Old 09-05-2005, 11:59 PM   #23
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There ya go mate http://www.boatmadforum.co.uk/showth...&threadid=2617 says about the fuel jets the 5th post down
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Old 10-05-2005, 08:43 AM   #24
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They are either not the latest carbs or the wrong jets - we use 94's to run an XR2 in with!
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Old 10-05-2005, 01:43 PM   #25
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Quote:
Originally posted by Cookee
They are either not the latest carbs or the wrong jets - we use 94's to run an XR2 in with!
Cheers guys - Cookie orginal specification does say otherwise http://www.boatmadforum.co.uk/showth...&threadid=2617

I guess there are different carbs the one in the picture llooks like mine though with the horizontal tray. Is that one less HP than others? Whats the differance?

Dosnt mention HP on the sheer Muts Nuts Kindly loaded up?
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Old 11-05-2005, 09:34 AM   #26
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Mine has the "alien" cowling so its newer than that manual!
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Old 11-05-2005, 10:00 AM   #27
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Is newer more HP?
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Old 11-05-2005, 04:47 PM   #28
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yep the newer are 200 hp the older are 178 hp
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Old 12-05-2005, 09:10 AM   #29
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Thats why we where going slower in the race than everyone else! Does that mean that this "new" engine I have is 178HP based on the jets / Carbs? The seller said it was 200HP?

Can anyone tell from a pic?
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Old 12-05-2005, 05:53 PM   #30
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Quote:
Originally posted by Silversurfer
Thats why we where going slower in the race than everyone else! Does that mean that this "new" engine I have is 178HP based on the jets / Carbs? The seller said it was 200HP?

Can anyone tell from a pic?

Post a pic JBD should be able to tell you.
he says your old one was a 200hp
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Old 12-05-2005, 05:58 PM   #31
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You should run one size bigger main jets in cylinders 2 and 5 casue they run the hottest. However, be aware that the inlet manifold crosses over though so its the carbs in front of 1 and 6. okie dokey
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Old 12-05-2005, 06:00 PM   #32
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Quote:
Originally posted by Burty
Post a pic JBD should be able to tell you.
he says your old one was a 200hp
It was the 2.5 style block motor
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