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Old 17 December 2014, 21:56   #1
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2002 Yamaha F50 prime start / choke

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Hi all. Newbie on the forum.

I have a new-to-me 13’ rendova with 2002 F50 Yamaha. Question is about the carbs.

It is very hard to start so I wanted to check the carbs are ok. All is fine once warmed up. I understand that F50 are very cold-blooded but this seems far wore than that.


I see that older F50’s have chokes. My year is listed as having prime starter so I assume that is what I should be looking at. However my carbs do not match the online parts diagrams, not can I see anything that matches the older chokes or the newer prime starter components. I checked what I could find online for later 90’s through 2005, thinking it might be carbs from the wrong year.


The number is F50TLHA, which is listed as a 2002. (from what I read the H means tiller steering, whereas mine is not, but I don’t think that impacts anything)

I attach a photo.

Can anyone shed any light on the prime starter for this specific model?
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Old 18 December 2014, 03:03   #2
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Originally Posted by nmuir999 View Post
Attachment 101678

Hi all. Newbie on the forum.

I have a new-to-me 13í rendova with 2002 F50 Yamaha. Question is about the carbs.

It is very hard to start so I wanted to check the carbs are ok. All is fine once warmed up. I understand that F50 are very cold-blooded but this seems far wore than that.


I see that older F50ís have chokes. My year is listed as having prime starter so I assume that is what I should be looking at. However my carbs do not match the online parts diagrams, not can I see anything that matches the older chokes or the newer prime starter components. I checked what I could find online for later 90ís through 2005, thinking it might be carbs from the wrong year.


The number is F50TLHA, which is listed as a 2002. (from what I read the H means tiller steering, whereas mine is not, but I donít think that impacts anything)

I attach a photo.

Can anyone shed any light on the prime starter for this specific model?
Hi & welcome to Ribnet.
Firstly I know bugger all about your engine, so take anything I say with a big pinch o'salt. The Prime starter could be an electronic choke that is operated by a solenoid. If your engine started life as a tiller steer & has been converted to remotes, then the electrical connection for the choke from the helm might be missing. Just a thought & as I said, could be complete bo11ox. There's more discussion here: 2003 Yamaha F50 Four Stroke - Help! - Walleye Message Central
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Old 18 December 2014, 08:51   #3
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Thanks Dave.

What I don't get is there is no obvious (to me at least!) prime starter mechanism on the carbs.

(should be on carbs 1 and 3 according to some parts listings Yamaha F50tlra/t50tlra 2002 Carburetor - schematic partsfiche)

I have seen posting on the different means to control them - some via key and some automatic when the ignition is on. Trick for me is there seems to be nothing to control! (ie no primer starter)

Thanks in advance for any help anyone can provide!
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Old 18 December 2014, 09:06   #4
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2002 Yamaha F50 prime start / choke

Here it is - number 34

Its a white plastic solenoid with two wires running from it (Black earth and Blue from memory).
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I've an entire 4 carb setup here from a used F50 engine if your interested in buying the whole rig, message me


Peter @ Boatsandoutboards4sale
07930 421007
www.BoatsandOutboards4Sale.co.uk
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Old 18 December 2014, 09:13   #5
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Here it is - number 34

Its a white plastic solenoid with two wires running from it (Black earth and Blue from memory).
Attachment 101688

I've an entire 4 carb setup here from a used F50 engine if your interested in buying the whole rig, message me


Peter @ Boatsandoutboards4sale
07930 421007
www.BoatsandOutboards4Sale.co.uk
Hmm! looking at the OPs original pic, there's a blue wire disappearing down the opposite side of the carb block, could be it.
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Old 18 December 2014, 09:37   #6
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As mentioned above by the Guys, Its item 34...

If i remember the choke is a wax stat type thing.. if you just connect it up you wont see any movement for ages. and it works in the opposite way.e;g when off, it retracts.

When the engine is cold and ign is off.... not in use, the plunger is in it fully retracted state.e;g choke is on...
When ign is on and engine starts....The wax stat moves VERY slowly (as the wax heats due to internal windings) starts to push the plunger out e'g to stop excess fuel going through..as the engine warms

If yours isnt working then I would suggest taking the solenoid type thing off and cleaning it all through.
then wire it up with your original wires on the engine and watch it move (after 5mins) it only moves Millimetres.
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Old 18 December 2014, 09:41   #7
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Oh and the other thing.. its NOT on all three. Just one OR possibly two and the other 2 solenoid looking things are possibly the fuel shut off valves (to prevent overrun and emission's n shit)

OR

it could be you have two wax type choke things!! I really cannot remember as Im getting old.

I had the same on my F40 and when I cleaned out the wax stats it started perfectly and came off choke within 4-5 mins
On the 3 pot engines Im sure you have one place on cylinder 1
and on the four pots engines you have 2.
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Old 18 December 2014, 17:34   #8
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Thanks guys. Yes, discovered on the back side of carb # 1 - a bit buried under the top cover.

Thanks for the help and comments. Now onto diagnosing it! I saw some other threads on how to test it, how slow it is, how it doesn't move much etc. I'll post up whether it makes the difference, though might be after Christmas now!

Have a good holiday everyone.
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Old 17 April 2018, 10:04   #9
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I hope that you don't mind me bumping an old thread, but I am having similar issue(s) with my 2004 F50, after some thoughts...

When cold the engine struggles to start, and when you try to accelerate it cuts the power, although after getting it warmed up it really struggles to hit WOT. After about 30 seconds or so the power will suddenly kick in and it will run fine.

Engine recently serviced with fresh fuel and carbs/jets all cleaned & fresh fuel,but that made 0 difference at all. I assume if it was an electrical problem then the issue would be more consistent regardless of temp/rev range?

The choke have been taken out and cleaned out. Maybe I will need to have a look at the solenoids.

Another thing is, there appears to be water coming out of the middle exhaust hole - not sure if this is normal for this 2004 50AET model.

Thanks,

Will
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Old 17 April 2018, 12:31   #10
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Take out the solenoid and look at the brass needle. A clue would be that there is corrosion around the base.. if there is you will need to unblock the hole to which the pin locates. These carbs will block easily if any manky fuel gets it..
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