Welch plugs

[jeff w 5]

Looking for Welch plugs for Walbro carb (WHL) 8hp Kohler. Any info appreciated!

[ebinmaine 79,153]

What size?

[jeff w 5]

I don't know, although it's a WHL-16 stamping on it

[jeff w 5]

Possibly 5/16, or 7.9-8.0mm

[ebinmaine 79,153]

I don't have any here that small. There's a place in Washington state if I remember right. Mike's carburetor. Google search that and measure your own plugs carefully and give them a call.

[lynnmor 8,847]

11 minutes ago, ebinmaine said:

I don't have any here that small. There's a place in Washington state if I remember right. Mike's carburetor. Google search that and measure your own plugs carefully and give them a call.

Measuring the hole might be better than trying to measure a plug that has been wrecked when removed.  Calipers would be best but if you have a good drill set you may be able to use that as plug gauges.

[jeff w 5]

Thanks for info! I've decided to put in ultrasonic bath w/current plugs in. Have talked w others who have used that method w/excellent results. I shall find out....

[ebinmaine 79,153]

1 minute ago, jeff w said:

Thanks for info! I've decided to put in ultrasonic bath w/current plugs in. Have talked w others who have used that method w/excellent results. I shall find out....

 

 

Odds are good that'll be fine.  I've cleaned at least a couple dozen carbs that way.  

I run them through the ultrasonic cleaner at least 3 to 5 cycles.  Often more.  

 

When you're done with the UC - spray a whole can of brake cleaner through all the ports and orifices every which way but loose.  

 

[Bar Nuthin 2,522]

5 hours ago, ebinmaine said:

I run them through the ultrasonic cleaner at least 3 to 5 cycles

What is your preferred solution to use in your ultrasonic?

[ebinmaine 79,153]

5 hours ago, Bar Nuthin said:

What is your preferred solution to use in your ultrasonic?

 

 

I've been using lacquer thinner for a few years.  Seems to work good and lasts well.  

I do NOT use the heat cycle. 

 

I do have the thinner in a separate smaller vessel and surrounded by water in the machine.  

[jeff w 5]

Thank you for the info. I'm taking carb to someone who uses them regularly. He insists it will flush out under/behind plugs. Will see.

[Retired Wrencher 6,731]

On 6/12/2026 at 6:28 PM, ebinmaine said:

 

 

Odds are good that'll be fine.  I've cleaned at least a couple dozen carbs that way.  

I run them through the ultrasonic cleaner at least 3 to 5 cycles.  Often more.  

 

When you're done with the UC - spray a whole can of brake cleaner through all the ports and orifices every which way but loose.  

 

every which way but loose.    Nice pun there Erick. 

[jeff w 5]

Taking it 2 person who has done many ultrasonic treatments and said same as you; that should do the trick, though he felt one treatment would work. Hoping that and new kit will get my 8hp Kohler perfect again. Also, get that governor set too. Thank you, ebinmaine for your thoughts. If any issues I'll get w/you. Lastly, when removing, all it took to release the two screw mount was barely turning screwdriver, it was borderline loose ( looks like a very tight fit to get a socket on those. Will find out.

[Racinbob 12,996]

welch plugs | McMaster-Carr

 

 

[ebinmaine 79,153]

21 minutes ago, Racinbob said:

welch plugs | McMaster-Carr

 

 

 

 

McMaster Carr offers NO aluminum plugs