Yamaha 115 2stroke fuel issue and service manual request

[hawglife]

Hey Y'all, new member here, looking forward to being a member of the community!

Took the boat out this weekend, motor ran fine at wot and had plenty of power until slowing down for no wake zones. The motor did not like to idle, and if I powered down too rapidly it would die, and be very hard to start even when choked.
I would have to rev the motor a bit while choked and then release the choke, and then put it into gear in order for it to take off.
I could slow boat through no wake zones as long as I was giving it constant fuel.

I just changed the water fuel separator (was giving me problems and was completely full) before this trip, and the fuel bulb seems to be working.
Wife said the bulb wasn't staying firm, or pumping, but when I went back to check on it, it was pumping fine.

I haven't cleaned the carbs yet and the motor was sitting for a while apparently before I bought it.

Besides cleaning the carbs, is there anything I should do or look for before I get into tearing the carbs down? Or any advice anyone can share?
I know it's a fuel issue, but could it be a bad fuel pump?

Also does anyone have a copy of the service manual for my 1997 Yamaha 115 2 stroke saltwater series?
Please email me a copy to J.saa.engr@gmail.com

Thanks I'm advance!

[Jason2tpa]

The issue is most likely the carbs, low speed jets probably clogged. It's normal for primer bulb to collapse a little while engine is running. Completely collapsing while engine is running is a problem.

If the previous owner didn't give you maintenance records indicating when he/she last rebuilt carbs, or at least tell you when carbs were last rebuilt, I'd error on the side of caution by ordering new kits. Pull all jets, soak, and clear orifice's so you can see through each. If that's what you end up doing, and have the same idling issues after installation, post another thread including your motors model number and we'll help out.

Owners manuals can be found online for free download. Service manuals are downloaded online for a fee, usually $15-$30.

[99yam40]

The issue is most likely the carbs, low speed jets probably clogged. It's normal for primer bulb to collapse a little while engine is running. Completely collapsing while engine is running is a problem.

Primer bulbs should not collapse any.
It may not stay firm while fuel pump is sucking gas thru it, but if it collapses any there is a restriction between it and the tank

[hawglife]

The issue is most likely the carbs, low speed jets probably clogged. It's normal for primer bulb to collapse a little while engine is running. Completely collapsing while engine is running is a problem.

If the previous owner didn't give you maintenance records indicating when he/she last rebuilt carbs, or at least tell you when carbs were last rebuilt, I'd error on the side of caution by ordering new kits. Pull all jets, soak, and clear orifice's so you can see through each. If that's what you end up doing, and have the same idling issues after installation, post another thread including your motors model number and we'll help out.

Owners manuals can be found online for free download. Service manuals are downloaded online for a fee, usually $15-$30.

Thanks,
I will clean the carbs this weekend, is it really necessary to buy the carb kits? Seems like all it is is gaskets and o rings pretty much.
When I rebuild my 90 carbs I never bought the kit, as long as I am careful with the gaskets, and haven't had a problem with them. Is it more of an issue since I do not know the history of this motor, nor the condition of the carbs?
I think I will tear them apart and then see if I need the kit, or not.

Primer bulbs should not collapse any.
It may not stay firm while fuel pump is sucking gas thru it, but if it collapses any there is a restriction between it and the tank

Yeah, It does not collapse, I will clean the carbs, make sure their is no more water in my water fuel separator (i.e. water in the tank), make sure all the fuel fittings are actually clamps, and not zip ties, and are tight, and make sure the fuel is clean, and then run it again, and repost if something is not right.
Thanks for the responses!

[Jason2tpa]

Primer bulbs should not collapse any.
It may not stay firm while fuel pump is sucking gas thru it, but if it collapses any there is a restriction between it and the tank

Guess I used the wrong word to describe what you detailed. Bulb should not be firm, but not be collapsed

[Newbie@boats]

Thanks,
I will clean the carbs this weekend, is it really necessary to buy the carb kits? Seems like all it is is gaskets and o rings pretty much.
When I rebuild my 90 carbs I never bought the kit, as long as I am careful with the gaskets, and haven't had a problem with them. Is it more of an issue since I do not know the history of this motor, nor the condition of the carbs?
I think I will tear them apart and then see if I need the kit, or not.




Yeah, It does not collapse, I will clean the carbs, make sure their is no more water in my water fuel separator (i.e. water in the tank), make sure all the fuel fittings are actually clamps, and not zip ties, and are tight, and make sure the fuel is clean, and then run it again, and repost if something is not right.
Thanks for the responses!

When I rebuilt my carbs I did not buy any kits, but I did find a damaged jet when I took them apart....You never know what you might run into.....Might be a good idea to get at least 1 just incase

[99yam40]

I would just take apart and then see what you need to complete the job and then order just what is needed

[amahaork]

gas tank pick up tube may be clogged, fuel pumps new?
engine utilize two fuel filters: after fuel tank and engine mounted
why tear apart carburetors if it was running ok before
carburetor is the last item in a fuel train
more chances to inflict damage