Chinese Carbs holes not tapped. - Snowblower Forum : Snow Blower Forums
 
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post #1 of 9 Old 02-07-2017, 11:25 AM Thread Starter
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Chinese Carbs holes not tapped.

Just a quick question to those who have bought the Chinese carbs from Ebay and Amazon. I have bought three as spares for machines, but two of them do not have the side holes that hold the heat shield on (the side ones) tapped. They are drilled but not threaded. What do you do when you install the carb? I have not had to use mine yet (hope not to for a long time), but when the case arises, do I need special self tapping screws?

Thanks in advance.

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post #2 of 9 Old 02-07-2017, 11:36 AM
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tap them...mine were tapped poorly or not deeply...I just ran a 8-32 tap down them........easy peasy
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post #3 of 9 Old 02-07-2017, 11:47 AM
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I agree with Cranman, the several I've bought from different sellers, were either not tapped, tapped but not deep enough, or tapped poorly, where I could not start the screws, so I tapped them or ran the tap through them to ensure no problems. I suggest you do this on all of them regardless.
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post #4 of 9 Old 02-07-2017, 07:50 PM
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Quarter inch self tappers


-efisher-
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post #5 of 9 Old 02-07-2017, 08:40 PM
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Check your screws that came out of the old carb, many of them have what's called a trilobe screw, when you look at the end of the screw it has a triangular shape. These are designed to roll a thread into that un tapped hole as you turn them in. They should turn right in to that straight hole without excessive force. I just did a carb on my snow blower about 4 days ago and it has those types of screws.
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post #6 of 9 Old 02-07-2017, 08:44 PM
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Pop that bowl off too. Somtimes they are missing one of Welch plugs too. Better to know now.
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post #7 of 9 Old 02-07-2017, 11:26 PM
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I've had that issue too with the holes not being tapped, was the only bad part of those carbs, otherwise they have worked just fine. I'll continue to get em.
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post #8 of 9 Old 02-08-2017, 07:54 AM
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Quote:
Originally Posted by e.fisher26 View Post
Quarter inch self tappers


-efisher-
Just to be clear, that's 1/4" *length* not 1/4" diameter!

I'm not sure the exact diameter of the screws but they're much less than 1/4". My best guess is they're #8.

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post #9 of 9 Old 02-08-2017, 07:47 PM
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Exactly, i dont know the number, but i used a 1/4x1/2in long self tapper, worked great.


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