phbg clone 21mm unfamiliar holes

Alan Jackson /

i have 2 holes either side of the float valve. are they supposed to be there? im tempted to fill them in.

are they casting flaws or has a metal eating maggot or worm found its way into my float bowl?

i do get an impressive amount of blowback through the carb almost like i have a hose pipe for my pilot jet. and strangely enough it runs.

Re: phbg clone 21mm unfamiliar holes

Why not simply follow them through the body . Find where they go and that might tell you what they are good for . ;)

Re: phbg clone 21mm unfamiliar holes

Alan Jackson /

i have done.

they seem to lead to an imaginary world that i hoped existed where people actually give you helpful answers. like fill them or leave them.

do you not think i have looked and blown down them and sent my own pet maggot with some cotton attached so i can follow its progress?

they go to the top of the needle valve. they could be there on purpose?

i couldnt find a worm or maggot.

i am asking because my other phbg clones dont have them.

Re: phbg clone 21mm unfamiliar holes

Alan Jackson /

in fact ive found another cloned phbg that has one hole but its got a tiny brass ball wedged in to keep it shut.

and i found another that has no holes.

im guessing they shouldnt be there or the brass balls have fallen out?

unless its a new development to aid float filling because they do lead to the sides of the area where the rubber tip of the float valve controls flow.

Re: phbg clone 21mm unfamiliar holes

My suggestion of following and finding was meant as helpful .

Not hand holding , spoon fed helpful because you seem to be somewhat aware . "unfamiliar holes" suggests that you did nothing but see what we see in the pic .

If you did what you say you did , those holes would hide no intimacy .

Anyway , good you have some adventure and curiosity in you .

If the carb performs as good as you say , I'd leave well enough alone .

Re: phbg clone 21mm unfamiliar holes

Or , you could close them and see how it does .

I'd fit screws in the holes so they could be reopened if they prove the need .

Re: phbg clone 21mm unfamiliar holes

Those passages are in every PHBG i own

Re: phbg clone 21mm unfamiliar holes

Alan Jackson /

i have 4 phbg clones and only one has a hole and thats closed off with a brass ball

the others dont.

i mean the two tiny holes next to the float valve. not the big holes.

does yours have those tiny holes mike boyd? not the big ones.

this carb runs poorly but i dont know if its due to my reed valve conversion on an av7 and 2 boost ports i cut that could be pressuring my intake and leaking chinese copy v force reeds could be allowing the fuel to spit out of the carb.

or it could be these holes.

they are not in the other phbg clones so to me are unfamiliar. i cannot see right down into where they go but i know they go towards the valve seat area.

if mike boyd says his phbg's have them then maybe they are meant to be there.

hey PD you sound as if you are calling me a liar ie not looking at where they went. do you not think this would be the first thing i did? and not come rushing out of my garage to my pc and post a question on a forum in a different timezone to me where most people are asleep?

if you havent got a phbg clone then pd i dont see how you can help here. apart from suggesting stuff which is the obvious course of action should a positive response not materialse from someone who owns one. mike boyd might just have been that response. in which case its my port job/reeds thats the problem.

i suppose i can try the carb on a different motor.

and i do have a clear plastic float bowl for the phbg's.

Re: phbg clone 21mm unfamiliar holes

19 clamp style and 21 spigot style pictured, non clones. Both have them. My other two have them as well but are currently on bikes. AFAIK those passages are where the fuel enters the float bowl when the float valve is down.

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FEB9C157-C340-436C-B3AA-C66E84EA3F7A.jpeg

Re: phbg clone 21mm unfamiliar holes

> Alan Jackson wrote:

> -------------------------------------------------------

>

> hey PD you sound as if you are calling me a liar ie not looking at where

> they went.

Sorry , it wasn't meant to sound like calling you a liar .

More about maybe you didn't delve deep enough to know for sure .

Seems that Mike has your answer .

From my experience , never have I seen a carb with those holes .

The channel that the float needle lives in is always round with the needle being square . That combination allows plenty of fuel to enter the bowl .

Again , sorry for my lack of directness .

Re: phbg clone 21mm unfamiliar holes

Alan Jackson /

> Mike Boyd wrote:

> -------------------------------------------------------

> 19 clamp style and 21 spigot style pictured, non clones. Both have them.

> My other two have them as well but are currently on bikes. AFAIK those

> passages are where the fuel enters the float bowl when the float valve

> is down.

> >

excellent thanks mike. i just tested mine to see if it leaked when the float valve was in the shut position but it didnt. so i can leave them alone and the problem lies with my porting/reeds etc.

Re: phbg clone 21mm unfamiliar holes

Alan Jackson /

> P D wrote:

> -------------------------------------------------------

> > Alan Jackson wrote:

>

> > -------------------------------------------------------

>

> >

>

> > hey PD you sound as if you are calling me a liar ie not looking at

> where

>

> > they went.

>

> Sorry , it wasn't meant to sound like calling you a liar .

>

> More about maybe you didn't delve deep enough to know for sure .

>

> Seems that Mike has your answer .

>

> From my experience , never have I seen a carb with those holes .

>

> The channel that the float needle lives in is always round with the

> needle being square . That combination allows plenty of fuel to enter

> the bowl .

>

> Again , sorry for my lack of directness .

no problem. its hard to read in between the lines of someones post to see whether they are being arsey or not and i thought you were and so i added a bit of my arse lol. good job i didnt try filling them. although as you say the passage where the valve is should be sufficient to admit enough fuel.

i too have never seen these holes in any carb and the float valve as you say is square or in some cases triangular? and in a round hole that should allow plenty of fuel in.

i tested it by attaching it to a fuel line and also tried squirting carb cleaner down them and when the valve is shut they lead nowhere.

oh well its not the news i wanted to hear cos it means my porting or my reeds are the problem causing fuel to spit out of the carb much more than is normal.

cheers mike and pd for your input.

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