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Old 13 March 2006, 18:28   #11
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Quote:
Originally Posted by Hugh Jardon
... my concern would be it running to lean and possibly burning a hole in the piston if the reeds are opened up but the same carb kept...
Cumon Hugh, have a wee think. Why would it?
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Old 13 March 2006, 18:49   #12
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very intresting thread, ive just checked the specs of my 2002 75hp mariner and compared it with the 90 hp. same engine!! so........how do i get the extra 15hp out of it! any suggestions welcome.

many thanks
andy
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Old 14 March 2006, 06:06   #13
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Quote:
Originally Posted by jwalker
Cumon Hugh, have a wee think. Why would it?
on that engine i am not aware of carb sizes and jet sizes and due to the restriction caused by the reed block i am not sure what impact this would have on the fuel air mix and if it might lean off too much on higher throttle settings

on my engine it is not an issue as i had a throttle stop and carb same for 9.9 and 15 but, if on earlier engines they used a different carb for the 15hp with different settings then care would need to be taken

i certainly would not want to suggest that someone do something that then caused early engine failure!!!

so

i will leave it to others to recommend if only the reed block needs changing or adjusting or if the carb would need changing as well

Hey JW, i am hoping to get a nice technical explaination and sketch from you with your recommendations......
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Old 14 March 2006, 06:21   #14
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Quote:
Originally Posted by Hugh Jardon
...Hey JW, i am hoping to get a nice technical explaination and sketch from you with your recommendations......



Nah, not this time.

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Old 14 March 2006, 06:51   #15
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Fancy having a chat on how modern day engines deal with the Stoichiometric Ratio of modern day fuels? and how they can run leaner than before giving better economy but still presenting smooth operation?

Quote:
Originally Posted by jwalker



Nah, not this time.

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Old 14 March 2006, 07:19   #16
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Originally Posted by Hugh Jardon
Fancy having a chat on how modern day engines deal with the Stoichiometric Ratio of modern day fuels? and how they can run leaner than before giving better economy but still presenting smooth operation?
Nah. It'll problee hurt me brain like that fkin waterjet thread.

But you go ahead.
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Old 14 March 2006, 07:47   #17
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was just teasing you on that one, i did it so many years ago now that i cant remember all the detail to be honest!



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Nah. It'll problee hurt me brain like that fkin waterjet thread.

But you go ahead.
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Old 14 March 2006, 08:27   #18
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Quote:
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...i cant remember all the detail to be honest!
It's reassuring that others have this problem too.

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Old 14 March 2006, 13:37   #19
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While we are at it ,has anyone else ever looked into uprating 150 hpdi yam to 200,i'm told it's ECU and exhaust manifold change but have no idea on difficulty or cost etc.?
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Old 14 March 2006, 16:26   #20
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upgrades

Hi all tech boffs
can you increase the hp of a yamaha 85 if so what would it take
info would be apreciated
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