EFI vs. Carburated

colbysmith · Posted: Sat Feb 11, 2012 7:49 pm Post subject:

[The first Merc 4-stroke EFI's were Yamaha power heads on Mercury lower units. Check into that particular engine. Is it a Yamaha painted black? I'd take the Yamaha 115 EFI over the Carbureted Honda 90 for both the EFI and HP, any day! Lower ends are probably somewhat equal, though the Honda has a reputation for a lower unit that is easy to corrode! ]

How would I know if it's a Yamaha? It's on a 2007 boat, and I assume the same year.

Sea Wolf · Posted: Sat Feb 11, 2012 8:02 pm Post subject:

REBEMUP · Posted: Sun Feb 12, 2012 2:37 am Post subject:

OK, here is a theory I have been working on. Probably has no value so I would be happy to hear why it is not true.

My 2006 Carb Honda 90, after sitting for 3 to 5 weeks does not start right up but cranks for maybe 30 seconds total before sputtering, stopping, then starting etc. When it starts there is then a little blue smoke which looks like oil.
Any start after a short warm up is instant and just like an injected engine and has no smoke even the next day.

So not letting the engine fire right up may bring a little oil into the cylinders which then burns off quickly. I think this might be a good thing where the cylinders, etc. are dry after not starting for weeks. Is there a reason this would not be true? This would not be a problem in a car that is started every day.

Further these Honda 90 carb engines often have very long lives and some forums here point to shorter lives on the newer fuel injected model.

Don't know if there is any correlation but I guess it is a question in my mind.

Ron

Chester · Posted: Sun Feb 12, 2012 4:09 am Post subject:

hardee · Posted: Sun Feb 12, 2012 7:01 am Post subject:

jennykatz · Posted: Sun Feb 12, 2012 8:34 am Post subject: eng

I would look at the merc 115 it's powerhead is the 1.7 litre with merc lower unit ,prop and mercury electronics. my f115 yamaha is still running strong 6yrs runnning . always starts runs great and I get 4.5-5mpg out of a cc-23 (venture hull)

As far as canvas goes that is a lot cheaper to replace then a motor . When we had our cd-22 cruiser I had a single axcel trailer no problems always carried a spare tire only used it once .

Tug · Posted: Sun Feb 12, 2012 11:22 am Post subject:

I had four carbureted Yamaha's bought new on previous boats...( 2 ) F90..Yam( 1 ) F80 Yam and ( 1 ) F100...Yam ..really loved them, never a problem and started on the coldest of days. When i repower i will get a another F90 Yamaha but it will have to be EFI because i am not sure if they make the carbureted model anymore. The EFI may be more fuel efficient but idle at around 700-800 RPM ..( if i recall correctly ) ...which is terrible for trolling , the kind i do anyway. There is an option to lower the RPM's but it will cost you more money,if you want to troll at a lower speed or drag a pail. Carbureted or EFI the Yamaha motor is the best motor on the market today.. Tug

thataway · Posted: Sun Feb 12, 2012 12:14 pm Post subject:

Chester · Posted: Sun Feb 12, 2012 12:45 pm Post subject:

[quote="thataway"]

C-Nile · Posted: Sun Feb 12, 2012 1:19 pm Post subject:

[quote="Sea Wolf"]

Rob & Karen · Posted: Sun Feb 12, 2012 1:46 pm Post subject:

Tug · Posted: Sun Feb 12, 2012 2:07 pm Post subject:

thataway makes a good point, any motor isn't much good if it breaks down and there is no dealer close by to fix it. In reality i based my option on Yamaha's being a great motor in part because of the availability of parts and service in my area.. The only reason i am considering selling my Suzuki. ( runs great ). is that the closest dealer is a couple hundred kilometer's away and they don't even sell Suzuki's they just repair them. I would hate to break down in the middle of the summer and be stuck without a motor.Hopefully i will be able to get a couple of thousand in trade for a new F90 Yami and while i am repowering i will replace my NFB steering and control cables. Tug

colbysmith · Posted: Sun Feb 12, 2012 2:12 pm Post subject:

Rob, I did speak to Randy earlier, and he had good things to say about the motor. We also talked about the fact it was rigged higher on the boat for shallow water, and if that is the boat I end up with, I would need to drop the motor, maybe one hole. I didn't know the Yamaha thing when I talked to him earlier.. In the end, would that really make a difference on getting a used boat with that engine? Or if I did, what would I need to do differently or expect from the engine.

Rob & Karen · Posted: Sun Feb 12, 2012 4:19 pm Post subject:

colbysmith · Posted: Sun Feb 12, 2012 10:58 pm Post subject:

Thanks Rob. Do you ever feel your boat is overpowered? What about trolling speeds? Fuel useage? Also, is your boat a "high top"? I remember someone telling me they thought that dealer only sold the high tops. Do you see any disadvantages of going with that motor, instead of a 90? Colby