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Old 14 March 2006, 16:44   #21
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most 9.9 engines are detooned versions of more powerful engines. The reason is that somewhere in Euroe ( France I think) has a serious tax break (like no VAT ) on engines under 10 HP. Hence the 9.9 models offered by most manufacturers are usually detooned 15's and should be relatively easy to adjust/mod
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Old 14 March 2006, 16:50   #22
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it seems a lot of folks are interested in trying to upgrade their current engine to the more hp version, perhaps we should have a thread where folks can post talking about the mods done to engines to get them to the higher hps
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Old 14 March 2006, 16:55   #23
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sensible idea
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Old 15 March 2006, 01:48   #24
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i am curtrently looking for aux my self,, this could be the way to go then,
hugh me old mucka. can you just confirm which model and year if it matters that i am looking for to do this mod,,
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Old 15 March 2006, 03:30   #25
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mine is a 2001 or a 2002 i believe

it is the current more rounded model, cant dig out the actual model number till later but a pic is below
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Old 22 March 2006, 09:27   #26
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Quote:
Originally Posted by Hugh Jardon
So Jonny or any experts, can you advise if it is possible to upgrade Steves or Dinos engine to 15 hp by just adjusting the reeds or buying the new reed block without changing out the carb. 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.......any advice for these guys

thanks guys

I just got my 9.9 Yamaha yesterday and the dealer performed the mod right in front of me. All he had to do is remove the throttle restriction and bend the reed valves. No additional parts. He said he's done quote a few of these as all his customers want that.
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Old 12 July 2006, 17:21   #27
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ask yamaha!
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Old 12 July 2006, 17:43   #28
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Quote:
Originally Posted by joakimhansson
ask yamaha!
ummm bit sore i see......

if you had read the first post properly you will see that i have been asked some questions via pms and was giving folks the benefit of advice i had had from yamaha dealers and sharing what it takes to convert a 9.9 yam to a 15 yam in an easy and cheap way. i had done it to mine and shared what it takes to do for themselves.

steve was free to phone yamaha but i could not advise him on his particular engine

does that help?

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Old 12 July 2006, 21:15   #29
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Quote:
Originally Posted by Rogue Wave
most 9.9 engines are detooned versions of more powerful engines. The reason is that somewhere in Euroe ( France I think) has a serious tax break (like no VAT ) on engines under 10 HP. Hence the 9.9 models offered by most manufacturers are usually detooned 15's and should be relatively easy to adjust/mod
A lot of American lakes have a 10hp limit on them too so there's a lot of engines with 9.9 covers over there that are 15's...
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Old 12 July 2006, 22:01   #30
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ah nos,glad to see that you are around b/c you are probably the best one to ask about doing a horsepower upgrade to a 40hp Mercury. have you tried it? is it possible?? how about yammie 75 going to 90??
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