Author Topic: carb drain bolt sizes  (Read 757 times)

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Offline racer1735

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carb drain bolt sizes
« on: January 22, 2018, 09:30:19 pm »
I stripped a head on one of the outer carb drain bolts on my '99 C10.  Notice on the parts fiche they show two different bolts, both M6, but one longer than the other.  I'm guessing the two inner bowls are one length and the two outer bowls are another?  If so, which is which?

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Re: carb drain bolt sizes
« Reply #1 on: January 22, 2018, 09:37:04 pm »
On carbs bowls 1 and 2 the drain screw's are accessed from the left.
On carbs bowls 3 and 4 the drain screw's are accessed from the right.

Whichever screw you stripped, pull the matching screw to check length..

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Offline GeorgeRYoung

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Re: carb drain bolt sizes
« Reply #2 on: January 22, 2018, 11:22:45 pm »
92009    92009-1487    SCREW,DRAIN,M6X1.0    4    
92009A    92009-1551    SCREW,DRAIN,M6X0.75    4

Looks like there are two types of screws, with different thread pitch.

Offline racer1735

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Re: carb drain bolt sizes
« Reply #3 on: January 23, 2018, 01:48:53 am »
Exactly. I could buy one of each, but I don’t need to have one drain screw on hand that may never be used (like the fork spring shims to a Ducati 900 that I sold in 2004,). So trying to figure out which of the two is in the outside bowl?

Offline CRocker

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Re: carb drain bolt sizes
« Reply #4 on: January 23, 2018, 02:02:24 am »
Sounds like all four are the same...a 6mm x 1.0 nut is fairly common...so, you might pick one up (Home Depot, Lowe’s, Etc) and see if it threads on...  If it does, that’s the thread pitch you need...if it doesn’t thread on...you need the other thread pitch...

Offline GeorgeRYoung

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Re: carb drain bolt sizes
« Reply #5 on: January 23, 2018, 02:47:34 am »
Amazingly, the float bowls only have part numbers for left and right.

16020    16020-1054    CHAMBER-FLOAT,RH,SIDE    2    
16020A    16020-1055    CHAMBER-FLOAT,LH,SIDE    2

To support the different pitch screws, there should be twice as many float bowl part numbers.

Assuming you can get out the bolt with the stripped head, you should be able to measure the thread pitch.

Offline CRocker

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Re: carb drain bolt sizes
« Reply #6 on: January 23, 2018, 05:49:11 am »
Amazingly, the float bowls only have part numbers for left and right.

16020    16020-1054    CHAMBER-FLOAT,RH,SIDE    2    
16020A    16020-1055    CHAMBER-FLOAT,LH,SIDE    2

To support the different pitch screws, there should be twice as many float bowl part numbers.

Assuming you can get out the bolt with the stripped head, you should be able to measure the thread pitch.

That IS quite interesting...?

Offline racer1735

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Re: carb drain bolt sizes
« Reply #7 on: January 23, 2018, 12:09:15 pm »
I did get the bolt out (did it while getting the bike ready for storage, so have the luxury of time now). Was able to grab the head since it was on one of the outside carbs.

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Re: carb drain bolt sizes
« Reply #8 on: January 23, 2018, 05:51:21 pm »
Take the one that has the stripped head to the hardware store They should have a sizing board somewhere around the nuts and bolts section that has various sizes and pitches of all the assorted screw and nuts they have in stock
I have no idea about anything.
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Offline Steve in Sunny Fla

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Re: carb drain bolt sizes
« Reply #9 on: January 23, 2018, 09:46:49 pm »
I got an email from Siberia from MOB. He wanted to help, and asked me to drop in this thread with info.  He had the screw info there, but I'm just gonna paraphrase. There is no left and right drain screw. the 99's are all the same, so no difference in thread pitch, that was a really early screw from back on 89 or so. You can't just go to the hardware store and buy a screw that will work, because of the tapered end. IMO, the easiest thing to do is use a dremel and cut a screwdriver slot into the damaged drain screw head. I've done it a time or two, it works perfectly. Steve, chanelling MOB  ;)
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Offline racer1735

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Re: carb drain bolt sizes
« Reply #10 on: January 24, 2018, 12:40:24 pm »
 I wasn’t sure if it was thread pitch or length that was different between the two screws?