Diaphragm pinholes concept

[Flyinfool]

Some one mention SNOW?????

[cowpuc]

Some one mention SNOW?????

 

Dog gone it,, woke up the Snowman we did,,, and I can tell we reminded him to pull maintenance oh his Wisconsin White Wash Machine,, was a perfectly good riding day yesterday but now its cloudy, windy and cold here...

[Condor]

Dog gone it,, woke up the Snowman we did,,, and I can tell we reminded him to pull maintenance oh his Wisconsin White Wash Machine,, was a perfectly good riding day yesterday but now its cloudy, windy and cold here...

 

Gotta watch out for dem Polar Vortexes... We got into a diaphragm repair discussion years ago and Wild Hair found a product that worked really well. Plasti-Dip spray. It's sold at Home Depot and I'm sure other places. I used it on a couple of my original '83 'phragms with success. The nice part about it is it coats the entire surface and not just a dab here and a dab there. So it'll repair existing pinholes and future holes as well....

 

[Venturous Randy]

This is making a lot more sense to me and I can understand how the hole in the end of the slide is what actually sees the vacuum and in essence causes vacuum behind the diaphragm, therefore causing it to open.

Now, my question; does it matter where the hole is located in reference to the carb body of the venturi? I know that as we have changed diaphragms, most of us probably have not paid much attention to the clocking reference of the tab on the diaphragm and the location of the hole in the slide. Does it matter if the hole is closer to the engine or the airbox? Is there a correct location for the hole?

RandyA

[Peder_y2k]

Only thing I can think of is if the hole is in the 'shadow' of the needle. There could be a very slight difference if one is in 'shadow' and the others are not. That's just a guess on my part.

-Pete, in Tacoma WA USA

[Condor]

This is making a lot more sense to me and I can understand how the hole in the end of the slide is what actually sees the vacuum and in essence causes vacuum behind the diaphragm, therefore causing it to open.

Now, my question; does it matter where the hole is located in reference to the carb body of the venturi? I know that as we have changed diaphragms, most of us probably have not paid much attention to the clocking reference of the tab on the diaphragm and the location of the hole in the slide. Does it matter if the hole is closer to the engine or the airbox? Is there a correct location for the hole?

RandyA

 

Actually the diaphragm vacuum is created by the oval orifice on the top lip of the venture. I found this by accident while blowing across the opening while cleaning a carb. The slide started to retract when I blew compressed air ACROSSED the opening. I don't think it would be a good idea to blow into the opening.....

 

[Flyinfool]

In theory, the clocking will put the hole at different points in the venturi. this could have an effect on the vacuum realized at the hole. Does it make enough of a difference to matter in the real world?

I have no clue.

I was told while getting my diaphragms replaced to watch for it and always make sure the hole goes back where it came from. All of the slides were clocked the same from the factory. So I make sure to follow that lead and instruction.

[Venturous Randy]

Actually the diaphragm vacuum is created by the oval orifice on the top lip of the venture. I found this by accident while blowing across the opening while cleaning a carb. The slide started to retract when I blew compressed air ACROSSED the opening. I don't think it would be a good idea to blow into the opening.....

OK, wondered about that. I will have to go look at a carb and see the oval orifice.

 

 

In theory, the clocking will put the hole at different points in the venturi. this could have an effect on the vacuum realized at the hole. Does it make enough of a difference to matter in the real world?

I have no clue.

I was told while getting my diaphragms replaced to watch for it and always make sure the hole goes back where it came from. All of the slides were clocked the same from the factory. So I make sure to follow that lead and instruction.

 

Jeff, do you know what that clocking orientation is supposed to be? I have one slide that is slightly lazier than the rest and that is with good diaphragms and good sync and checked for vacuum leaks.

RandyA

[Marcarl]

Now finally I can help out. The hole is designed to be at the bottom,, that is closest to the engine,,,, why???? I really can't tell you, other than the fact that it is probably warmer there and so there is less chance of snow clogging the hole,,,, and yes, you can get snow it the throat of a carb.

[MiCarl]

I believe the hole should be "down wind" (toward the engine) from the needle. This would minimize effects of the hole on the atomization of fuel coming in around the needle jet.

 

I doubt the hole position would effect the slide action much.

[Condor]

Jeff, do you know what that clocking orientation is supposed to be? I have one slide that is slightly lazier than the rest and that is with good diaphragms and good sync and checked for vacuum leaks.

RandyA

 

The vacuum port located at the bottom of the diaphragm cover, may have some blockage in it?? In this case, with the cover removed blow some air through it from the venture opening and see if that'll help. Just a WAG....??

 

[saddlebum]

I knew it,, I just KNEW that some how, some way, someone would find a way to bring SNOW into this subject... What is it with you people? Why cant we all just sit around the perverbial campfire and have an easy, fun loving, gearhead to gearhead discussion about our bikes without someone making it personal?

Take this particular saddle bum for instance. He reaches deep into his pocket filled with all kinds of perfectly useable nouns to use in his very well thought out example, so what does he do? He reaches into the depth of that pocket and has to pull out the most dreaded noun known to man, SNOW.. I mean,, really... Talk about .. If he had to use something cold and something that melts he could have used the word ice cream instead of the word snow.. I suggest we all think about the point I am trying make the next time we gather around the campfire to discuss these sensitive issues..

Oh well,, at least this winter when a truck goes by each one of us forming a vacuum around its tailgate we might pause and ask ourselves this question,, is that snow we see gathering or, is that in fact, vanilla ice cream?

 

Heyyy, Saddlebum,, seriously, GOOD example!!!!!!!!

Good example or not reading your response had me busting a gut. I couldn't stop laughing:rotfl: and after my ordeal at work tonight I needed it Bad. So thanks Buddy

[cowpuc]

Good example or not reading your response had me busting a gut. I couldn't stop laughing:rotfl: and after my ordeal at work tonight I needed it Bad. So thanks Buddy

You are welcome my friend,,,, actually I took one look at your avatar and thats what inspired my fingers to take over... Figured that little feller could use a scoop or two!

[saddlebum]

You are welcome my friend,,,, actually I took one look at your avatar and thats what inspired my fingers to take over... Figured that little feller could use a scoop or two!

What just for the little feller What about Me

[cowpuc]

What just for the little feller What about Me

 

Wellllll,, ok ya Bum,,, but just cause ya gave me another great quote for my signature...