Carby v efi Yamaha 60 4 srtoke : boats and motors

ponyplay · Posted: Mon Jan 30, 2012 10:35 pm Post subject: Carby v efi Yamaha 60 4 srtoke

Hi was wondering if any you boat experts could lend me sum advice.
I am looking at new boat it has a 60 yamah 4 stroke on the back which is carby 170 hours. Am i better of looking around for a fuel injected one. Wat pros and cons of both ??? Trolling ect

Trier

I don't know that much about outboards, but I would have expected all the larger motors (say over 30/40 HP) to be fuel injected these days!!!

No doubt you'll get your answer soon enough from the blokes who do know their beeswax!

olfart

Given the choice, personally I'd lean toward the carburetted model..But then I'm an oldfart, and carbies are second nature. fuel injection is precise and economical..till the ecu craps out, and shuts down the fuel system. The real advantage of carbs is, you can tune extra grunt in when required, withou having to buy a chip and then getting the ecu programmed to suit. If your anal about maintenance, a good set of carbs will never give drama's. Like I said I'm gen dinosaur. :cheers:

graham

rumjungle

There is no other choice but fuel injected these days. Why would you put your self through the whole carby,fuel clogging issues?? Carbys have maintenance issues, injection has far less.
It's a bit like the 2 stroke / 4 stroke contest ummm is there a contest?

2rods

Mate normally I would say go carb... But in a 50 or 60 yamaha go injection... I have worked on both and had Mates with both and hands down the injection has had less issues... Plus better on fuel...

Knowing where you are I would not go carby... But if you do get a VERY good fuel filter and DON'T let it sit.. Use it ever 1-2 weeks

Trier

Hi 2rods (or anyone else that knows their stuff), a couple of questions shrouded in ignorance: :uhh:

Do most of the manufacturers offer the choice of carb or fuel injection in engines up to a certain size (I assume most if not all 'small' outboards are carby only)?, and are they all EFI, or are some still mechanical? It just seems strange that you can still get carby's on (larger) outboards, yet (I think) you have not been able to buy a car without fuel injection for probably 15 years or more!

The other thing is CDI's. I think I saw someone on the forum refer to one in the last week or so. Again, I thought they went out with the ark, being replaced by electronic ignition. My father's old 85hp Chrysler had/has CDI and the engine was built the year man landed on the moon. I loved the sound (and shape) of that old outboard!

Sorry to hijack the post somewhat.

Just curious!

maxpower

Get an EFI if you can mate. The Yamaha 50/60hp EFI are the most reliable engines on the market.

ponyplay

This may sound stupid but i not very mechnically minded, so wats the best way to tell if it is fuel injected. going to have a look at it tonight and owner does not no either. So it will be like two dumb monkeys looking at a outboard :roll:

George

If indeed it is a carby model then put aside an extra 5-600 to allow for the carbs to be compleatly overhauled, I'm not 100% but I'm pretty sure that the carbys were phased out back in 06'. So if you have an 6yr old engine with only 170hrs on it, that ain't much and outboard don't like to not be used (fuel side of things).
In saying that they are a fine engine, if you get it and accept that you may have to iron out a few bugs to get it right. Then it will serve you well. I don't think that carb's suffer from dirty fuel any more that an injected motor will, as a build up of grime and such will affect injectors just a quickly as a carby. Were carb's suffer is if left with fuel still in the carbs, the fuel evaporates and leaves a residue which hardens to block jets. Best thing you can do is when flushing the motor disconnect it and let it run dry, and that will save you alot of hard ach.

And CDI is 'capacitor discharge ignition'-commonly used on two strokes and older 4's because of the speed at which the capacitor can "recharge" and discharge. The more common type IDI (? I think that mey be what it's called) is the coil type, however this needs a little more time to build voltage and also needs more amps to run, so hence why you see them on 4 strokes, and they usaly have one for every cylinder to increase the amount of time they have to built charge. Aslo the mid to large 4's have higher output alternators. Hope this answers a few Q's..................or maybe confused the situation more.
Good luck

George

ponyplay wrote:

This may sound stupid but i not very mechnically minded, so wats the best way to tell if it is fuel injected. going to have a look at it tonight and owner does not no either. So it will be like two dumb monkeys looking at a outboard :roll:

If it's carbed, you will see the black intake manifold go to 3-4 carbs stacked and linked by a common accelerator linkage.
If its EFI all the black inlet manifold will go straight to the head and you will see a common rail that will go down the length of the head with injectors comming offit at each cylinder.
:cheers:

maxpower

Should say on the cowling EFI. Red stripe.

Moonman

Mate if its a carby model and its a good deal go for it! 170hrs is nothing!! Mine is a carby model and has clicked over 2035hrs after the last trip. Consistantly does 3Km/L no matter what load or driving style on the 475 topender. Only had the carbies gum up twice in that time. First time took it to quality marine and had them cleaned as I didn't have time to do it myself and second time I did it my self for nothing... Not a big job if you have the time and someone with half an idea. This only happened after 1500 hrs as I didn't have an issue before then and have had no other issues with the motor. I think as long as you use it regularly (which im sure you will) you won't have any issues with the carbies. EFI would be nice im sure, but if the price is right i wouldn't hesitate with a yammy! Might be a little less power in the carby model im not sure?

ponyplay

cheers for the tips people :mrgreen:

Moonman

As George said if you plan on not using the boat for a while disconnect the fuel and run the motor dry.

Cheers
Moonman

grumpy

Moonman wrote:

Mate if its a carby model and its a good deal go for it! 170hrs is nothing!! Mine is a carby model and has clicked over 2035hrs after the last trip. Consistantly does 3Km/L no matter what load or driving style on the 475 topender. Only had the carbies gum up twice in that time. First time took it to quality marine and had them cleaned as I didn't have time to do it myself and second time I did it my self for nothing... Not a big job if you have the time and someone with half an idea. This only happened after 1500 hrs as I didn't have an issue before then and have had no other issues with the motor. I think as long as you use it regularly (which im sure you will) you won't have any issues with the carbies. EFI would be nice im sure, but if the price is right i wouldn't hesitate with a yammy! Might be a little less power in the carby model im not sure?

My old motor was the same motor with only a bit less hours than Moonman's and I agree with everthing he says. Only problem I had was gummed up carbs also.

They just go and go for ever, sounds like a good deal. :mrgreen:

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