Carb drain plug stripped

[Yamaha3535]

I have a 2003 yamaha txrb 130. So I went to drain my carb today and then when I went tighten it back up the bolt kept spinning and didn't get tight. I'm hoping it's just the bolt that tripped and not the carb side. If it happens to be the carb side would I have to buy a new carb or can someone rethread the inside of the hole? I have a tap and die set but I'd rather have someone who has exp do it? What type of shop should I bring it to if possible? Thank tou

[robert graham]

Since the drain plug/bolt is brass and carb is aluminum(softer), I'd guess the aluminum threads probably came out....A repair could be a challenge to be certain it won't leak, but maybe a Helicoil or similar type repair. A real no kidding Yamaha Outboard Technician may offer his experience and expertise regarding a solution to your problem....which doubtlessly has happened to other folks....hopefully some of these folks on here have dealt with this before and share their thoughts....Good Luck!

[ausnoelm]

Don't know that exact carb, but isn't the drain in the bowl that is easy to replace?

[TownsendsFJR1300]

Best option as your main jet is right underneath that drain bolt,


Buy a new bowl, part #4:

2003 130TXRB Yamaha Outboard CARBURETOR Diagram and Parts

There doesn't appear to be enough room for a heli-coil tap...


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[pstephens46]

Good advice so far. Marine labor round here is $100/hour. I would buy the part....and utilize that screw (gently) a little more often.

But if I was was stubborn, I might try to seal with a little 518 loctite.

But who wants a fuel leak under cowling?

[cleddau1]

Part 15 looks to be the drain screw at 7 dollars, the float chamber is part 4 at 100 plus, both will be needed. Not too expensive for peace of mind though.......

[Yamaha3535]

So I looked thru the manual and it doesn't have the thread size for the carb drain plug.i can't decide whether the bolt is 3/8-24 or 10m-1.25. I would think it would be metric but when j went to the auto store he used a gauge and said it didn't fit that well. Does anyone have experience with tapping the float drain plug or know the size of it? Thank you

[boscoe99]

You can go to Home Depot or Lowe's (take the plug with you) and they have some threaded rod or nuts that you can use to determine what size the plug is. Or, go to Sears and buy a thread gauge. Metric.

A hole is tapped. A plug is threaded. What is it that you are now trying to do?

[TownsendsFJR1300]

If that drain bolt is buggered up, pull one out of another carb.

The original threads would have been metric.

Do you have enough depth (with the main jet right there) to run a tap
fully thru? I seriously doubt you will...

And if just tapping to a bigger size, SAE or metric, it doesn't matter as that hole will have it it's own specially sized plug.



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[Yamaha3535]

I used screwed in drain plug into the other side of carb and it fit right in. So the threads are fine on the bolt but the hole is what is stripped.i want to at least try and fix it instead of spending over 100$ on a new bowl.ive seen a few ways of going about this. I will try either helicoil, time insert or just drill a bigger hole and tap new threads...most likely one of the first two.i don't think you need to go past the end of the hole with the insert or helicoil but not 100% sure about that.

[TownsendsFJR1300]

I used screwed in drain plug into the other side of carb and it fit right in. So the threads are fine on the bolt but the hole is what is stripped.i want to at least try and fix it instead of spending over 100$ on a new bowl.ive seen a few ways of going about this. I will try either helicoil, time insert or just drill a bigger hole and tap new threads...most likely one of the first two.i don't think you need to go past the end of the hole with the insert or helicoil but not 100% sure about that.

I use M6 x 1 heli-coils all the time on aluminum generator float bowls (so they FULLY drain when done).

The width of the M6 would be fine for yours BUT the heli-coil TAP (special sized tap)
needs at least 3/4" depth to go in and fully cut the threads.
Then the heli-coil can be inserted. If you have that depth, you'll be fine.

I'd suggest what ever mod you do, do it on a drill press so everything's dead nuts straight.

That size, is the general "standard" thread / bolt that you'd put a 10mm socket / wrench on (thermostat, fuel filter mount, etc)...



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