1978 cb 750 float bowl drain screw function?

[pat english]

Hey,been a long time since ive been on here,but im still obsessed with cb 750's..Anyways,Im trying to build the current cb 750 as cheap as possible,but i ran into a problem.The float bowl drain screws on 2 of the carbs would not come out.I tried everything but heating them with a torch.The heads of the screws got so bad after using the inpact screwdriver that i had no choice but to try and drill them out.That did not work either.
  So,my question is what is the function of the float bowl drain screw?can i just drill out the hole and re tap it and use a regular machine screw and crush washer?thanks,
                                                                                pat
     

[pat english]

i hav no idea where that pic came from.i did not post it...^^^^^

[TOOLS1]

That's not your picture?
The drain screws are just, for draining the carbs. Nothing else. I do not know why, you could not re-tap them, and use a machine screw with a crush washer.
TOOLS

[pat english]

lol yeah there was a pic of some wierd part..then it changed..then i realized it was an add on my thread...strange...anyways,thanks for the response.i think i can save these carbs then.(i hope)..the next issue is one of the slides was siezed and when i pulled it out is might have scorred the inside of the carb a bit.(like tiny scratches)..will this affect the performance of the carb at all?the slide will need to be replaced(i destroyed it when taking it out)..

[pat english]

(sorry,the part im talking about is called the throttle valve)

[pat english]

will these work?

http://www.ebay.com/itm/CB650-CB-650-CB750-CARB-CARBURETOR-THROTTLE-VALVE-SLIDE-/290419769444?pt=Motorcycles_Parts_Accessories&hash=item439e5e0064&vxp=mtr#ht_500wt_1279

[TOOLS1]

The scratches should not hurt anything. Just sand them smooth with some fine sandpaper. The slides on the ebay auction are, for the later keyhole carbs. If, you are working on a 75 model, it should have roundtop carbs.
TOOLS

[pat english]

right on.no.my bike is a 78 k with the keyhole type carbs.

[LukeM]

Welcome back, Pat.  I remember your posts from a year or so ago.  You welcomed me warmly. Sorry you're having troubles. +1 to TOOLS's post about drain screws. They serve 2 purposes: seeing if there's any gas in the bowl and what sort of crud is in there, and draining the gas from the bowl before disassembling it.

Good luck, and glad to see you again.  Keep us informed.
Luke M

[pat english]

oh yeah,crazy.yeah ive been jumping around forums for the past few years.decided to come back here.not really trouble as long as it can be fixed.the reason i asked was because the drain plug/screw looks more complicated then it needs to be.im glad its an easy fix because i cant find anyone selling just the float bowls.
im guna sand blast then wire brush the carb bodys.i know that sounds silly,but thats how i did all the covers on the engine and i really like the way they look.i want everything to match.

its been a while since ive been here,is photobucket the way to post pics here?im guna start a build thread soon.
      pat

[rrgunslinger]

I would use a soda blaster.  

On Mon, Jun 25, 2012 at 6:27 AM, pat english [via Honda CB750'S] <[hidden email]> wrote:

oh yeah,crazy.yeah ive been jumping around forums for the past few years.decided to come back here.not really trouble as long as it can be fixed.the reason i asked was because the drain plug/screw looks more complicated then it needs to be.im glad its an easy fix because i cant find anyone selling just the float bowls.
im guna sand blast then wire brush the carb bodys.i know that sounds silly,but thats how i did all the covers on the engine and i really like the way they look.i want everything to match.

its been a while since ive been here,is photobucket the way to post pics here?im guna start a build thread soon.
      pat

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[TOOLS1]

To post pictures here, just use the insert tab at the top of the reply box. You can post them right from your computer.
The carbs are made out of an aluminum/zinc alloy, and are not as sturdy as the side covers. I would not sandblast them. Glass bead blasting is as rough as, you would want to go on them.
TOOLS

[LukeM]

Photobucket works pretty well.  I'm using Dropbox as well.  

Wire brush on carb bodies?  Sounds a little abrasive to me. That's pretty soft metal.  There are a few guys who do lots of polishing of Honda parts here.  I'd search them out and see what they recommend.

Luke M

[pat english]

allrighty..maybe ill hold off on the sand blasting then and just try to clean them up.i dont know anyone who has a soda blaster and i dont wan to spend any money..yeah ill search around.maybe i can just clean them real good and polish with the dremal.

[pat english]

can anyone else confirm on the ebay link i posted?

[pat english]

the part number is 16111-410-004...i called the honda dealership.its discontinued and they dont have any in stock.the parts guy said the part number is the same for 77-78 cb 750.

[TOOLS1]

Those are the ones, for the keyhole carbs! You can get a soda blaster at Harbor Freight, for $20.00
TOOLS

[pat english]

ok cool.i thought i have the key hole carbs.ill post a pic of the carbs tonight.my computer is super slow.i messing with photobucket right now..again,my bike is a 1978 cb 750 k,not a 75...

[pat english]

here are some pics of the carbs.if anyone has a junk set that theyed be willing to part out that would be great.i need a throttle valve and 2 float bowls.