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Old 09 March 2007, 17:26   #1
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yamaha 75 2 stroke becoming a 90?

hi,
iv got a 2005 yam 75 2 stroke on my searider, and its great. but.... anyone got any idea how its restricted to 75? anybody made it into a 90?

it seems a relatively simpleish engine.... still on carbs... and its the same block.... so it must be do-able.

is it just a simple spacer between the carbs and block thats got restrictive holes, or more serious stuff?

thanks.....
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Old 09 March 2007, 19:06   #2
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I may be wrong but I think it's done with carbs.

Have a look at a microfiche parts cd (ebay) and see what's different. The carbs were the difference on my 50 to take it to 60.
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Old 10 March 2007, 03:37   #3
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2-stroke? I'd guess you're right on carbs with port sizes and timing running a close second.

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Old 10 March 2007, 06:23   #4
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carbs
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Old 10 March 2007, 07:54   #5
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hears them 90 premix carbs, thay make a set of oil injecter ones, they are square in style.
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Old 10 March 2007, 08:49   #6
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Are you sure its the same block and not a tuned 60/70 block which were smaller?

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Old 10 March 2007, 09:27   #7
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http://www.outboards-direct.co.uk/aw...p?vid=57&rip=1

yes, its definately the same block.
if its different carbs il leave it alone,

thanks
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Old 10 March 2007, 09:36   #8
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Yep worth a check though. However if the 75 is in good nick and running well would you want to mess about with it. Spring is just around the corner, seems a shame to risk lots of problems just as its warming up.

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Old 10 March 2007, 09:39   #9
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nope, it runns very nicely, only asking unless it was something simple,
swaping carbs is someting i dont want to do.....

thanks for your replys...
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Old 11 March 2007, 03:17   #10
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No use for 118118, but what's involved in upgrading an 85 to a 90?

John
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