Source - 5MM Aluminum Screws for Carb Synch Ports?

[rzinger]

Anyone know a part number for the 5MM aluminum screws and associated washers that go in the synch ports on 1979 CBX carbs? I looked at the online fiches but couldn't decipher the right numbers as the schematics are a bit loopy.

Thanks in advance

Dave

[Mike Nixon]

but not from the CBX parts list. Email me at home (I am at work). mikenixon(at)earthlink.net

[EMS]

You would think that after over 25 years all questions have been asked and answers been given. Then, ever so often, someone comes up with a zinger- no pun intended Like this one. I think it is 16038-422-004 screw set D. 6 off.

[cbx6ss]

Are these "Special" honda screws, or does someone know the size and thread pitch? The PO left me with six different screws.
Thank you.
/r
Brad

[daves79x]

I'm sure Mike will fix you up, but I have a bunch of them (they come in most of the Keyster rebuild kits). Washers, however, are another story. Not available separately and 5mm aluminum washers are impossible to find. I've tested lots of carbs w/out the washers in place and never found any vacuum leaks. If you need some screws, let me know.

Dave

[rzinger]

Dave - Would love some, I sent you a PM...thanks. Dave

[Mike Nixon]

You would think that after over 25 years all questions have been asked and answers been given. Then, ever so often, someone comes up with a zinger- no pun intended Like this one. I think it is 16038-422-004 screw set D. 6 off.

That is the screw set, which is a) very pricey, and b) no longer available, I think... :)

[415ZR1]

...

[Mike Nixon]

That is a pretty good choice I think. The exact factory screw is available from Honda still, but not as a CBX part. It is a part on the last SOHC 750 carburetor, 1978. It's cheap too, considering. The only bummer is, the 750, although it uses the same screw, does not for some reason use the aluminum washers the CBX uses, so that washer does not come with the screw. You'll have to get it somewhere else.

16016-410-601.

[bdento59]

I use M5 x 6mm allen head cap screws from McMaster-Carr with stainless shimming washers...

I used the same allen bolts (M5 x 6mm x .8p) and added M5 copper washers, also from McMaster P/N 98044A220. The (ferrous) steel allen bolts make removal and replacement in cyl #3 and #4 easier if you become friends with magnetism. You can temporarily magnetize your allen wrench by rubbing the end with a magnetic pickup tool. You'll drop less bolts this way. A dab of stiff grease between the bolt and washer will keep the (non-ferrous) washer in place upon replacement, or you can hold the washer in place against the bolt face with a 90º dental pick while inserting. Word of caution when using allen bolts, don't apply too much pressure when tightening, as you can strip the soft metal of the carb body.

[Rick Pope]

I use stainless allen screws for the synchports. A soft washer as Bill suggests is a good idea. A dab of anti-seize is also a good idea. To avoid over-tightening, use the short end of the allen wrench as your only handle. An inch or so of leverage is more than enough.

Oddly enough, most small stainless screws are magnetic. Something about the machining or rolling of the threads......