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Old 01 June 2014, 09:04   #1
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Yamaha F100 Advice Please

Hi

I am seriously considering buying a 10yr old Yamaha F100, (deposit paid) plenty of service history, and evidence of being well looked after.

Is there any advice/comments from anybody who has experience of owning or working with this engine?

Fuel economy?
Performance?
Handling?
Maintenance?
Insurance?

It will be used with a Ribeye 550 Playtime.

Thanks
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Old 01 June 2014, 11:33   #2
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If your F100 has a genuine full service history you should be fine !
( including replacement cam shaft belts at each 5 year interval , and perhaps a a gearbox seal check and valve clearance at ten years ) . Perhaps a water pump service every 2/3 years . Mine is now 14 years old and still does the " business " . Max 34 knots on a Ribcraft 5.85 . Estimate 1 nautical mile per litre ........better in the good stuff a little worse at rough / displacement speeds . I am not aware of any insurance implications if it meets your hulls weight and power limits .

Perhaps a weak link is the tilt & trim unit ? Is yours still the original ? Keep your eyes peeled for a second hand updated replacement which do become available from time to time .
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Old 01 June 2014, 12:26   #3
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+1 what Bern Hanreck said .
My F100A (carbs) is 15 years now but still does the job on a Buster XL .
Made the same experience with the PT unit . I replaced mine 3 years ago .
Be aware that these engines "making oil" when operated long period at low speed / load .
You will notice that the oil level increases which is caused by petrol .
Make sure that you use the right engine oil and run the engine from time to time @ WOT .
I like my F100 but when I had the direct comparison to an ETEC 90 the F100 felt like EXTREMELY weak & slow .
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Old 02 June 2014, 15:23   #4
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I had a carbed one which was great except for a failing tilt and trim, which I replaced for a use one and which also went bad. I also had to overhaul the carbs to get it to idle nicely. Cost a few hundred quid but well worth it. I would only go for an injected outboard now.
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Old 04 June 2014, 12:21   #5
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Forgot to mention that my rectifier also fried 3 years ago and according the US Yamaha forum this seems to be a common problem .
I had to change only the rectifier but in worse case the ECM can fry as well since it is directly located above the rectifier .
In my case just one corner of the ECM plastic housing was melted ..
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Old 04 June 2014, 13:11   #6
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Oh yes. So did mine! I forgot that. Easily diagnosed by burn marks in it!!!
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