Author Topic: Tickler/Primer plunger  (Read 1089 times)

Offline duTch

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Tickler/Primer plunger
« on: 01.04. 2017 10:41 »

 So dis arvo while having a coolie, I decided to extend the top of my Tickler/Primer plunger, to dispense with the 'Amal Finger' syndrome....but in doing so was reminded that the excess travel before striking the float was about ~3mm...and on dissection, discovered a bit of copper tube jammed up in the primer/tickler plunger.
 A too easy fix *woo*; replace with a ~+3mm longer bit of brass tube that fortuitously I had on hand...and then add on a bit of plastic hose with a screw in top to finish the job....I think *????**beer*


 
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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Online Greybeard

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Re: Tickler/Primer plunger
« Reply #1 on: 01.04. 2017 10:58 »
...'Amal Finger' syndrome...
Ooer Missus!  *shh*
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Offline duTch

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Re: Tickler/Primer plunger
« Reply #2 on: 01.04. 2017 12:56 »
 
 Nah was a reference to this;-
 
Quote
The BSA A7-A10 Forum »
    Bikes, Pictures, Stories & more »
    Chat, Offtopic, Relaxing & Diverse »
    Smell my finger..




    The BSA A7-A10 Forum »
    Bikes, Pictures, Stories & more »
    Chat, Offtopic, Relaxing & Diverse »
    Smell my finger..


 maybe try: http://www.a7a10.net/forum/index.php?topic=11419.msg86559#msg86559
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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Online KiwiGF

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Re: Tickler/Primer plunger
« Reply #3 on: 01.04. 2017 13:10 »
Im sure you have thought of it Dutch.....but the tickler doubles as a vent for the bowl, so air leaves through the vent as petrol fills the bowl......an important job....and depending on where the tube is that you've added if might be covering the little vent hole?

A blocked vent hole caused me much grief (run then stop  *razz* *dunno* *bash*) until I worked out that's what had happened, a nz bug bug called "mason bee" had made its home up there  *problem* *pull hair out* *spider*

https://en.m.wikipedia.org/wiki/Mason_bee
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Online RichardL

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Re: Tickler/Primer plunger
« Reply #4 on: 01.04. 2017 17:25 »

 So dis arvo while having a coolie, I decided to extend the top of my Tickler/Primer plunger, to dispense with the 'Amal Finger' syndrome..

I am either proud or embarrased to say I correctly guessed that "So dis arvo while having a coolie" meant "this afternnon while having a beer". Also, I think you went the right direction with "Amal finger" as opposed to "tickler finger". As GB notes,  "*shh*".

As for venting the float bowl, I get where KiwiGF is coming from, but can't reckon that, based on the tickler design on a concentric. There, I think there is no dedicated vent hole, but the button is no way sealed around the  button. That loose fit would seem to be enough to vent the bowl and I would guess the same for the carb in question. Am I wrong here?

Richard L.
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Offline duTch

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Re: Tickler/Primer plunger
« Reply #5 on: 01.04. 2017 19:32 »

 yepyepyep'nyep on most counts I guess without counting....I did decline from 'stink-finger', and yep it can't be seen, but I drilled a 3/32" hole through the brass and the plastic tubes which align, and the SS set-screw I used is long enough to engage the original plunger so as to not push the plastic tube on further and prohibit travel- it only needs to move far enough to allow fuel to flow (and as we all know, fuel will flow through anything when we don't want it to). There's about 1-2mm freeplay/endfloat

  Just to clarify, I replaced the copper tube with the +~3mm longer brass tube:
Quote
A too easy fix *woo*; replace with a ~+3mm longer bit of brass tube

 Kiwi- I did remember that and kept it in mind, Richard- That also occurred to me, but not hard to drill a hole (pictured I think)
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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

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Re: Tickler/Primer plunger
« Reply #6 on: 01.04. 2017 19:43 »
Well, I believe I've made the point in the past that I'm no expert on carburetors (or, maybe, anything). I just went out and took a look at my concentric and noticed a hole, apparently for venting, in the body of the carb where the tickler runs. Fine, but the gas overflow runs around the button, not out that hole.


Richard L.
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Offline duTch

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Re: Tickler/Primer plunger
« Reply #7 on: 01.04. 2017 19:50 »

 ah yeah...haven't been involved with Concentrics for a while, but had a feeling but forgot/didn't feel the need/too lazy to mention it........

Quote
......and noticed a hole, apparently for venting, in the body of the carb where the tickler runs.....
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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Offline duTch

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Re: Tickler/Primer plunger
« Reply #8 on: 04.04. 2017 10:58 »
 ....so I still have a stinkyfinger from the seepy gas-cock anyway, and today I discovered a design fault in my hi-tech anti-stinko primer stick; leaving todays highly prized work effort, I gave it a tickle, but the return spring flung the missile into orbit and it landed down a gully-pit.... took a bit of a Squizzy Taylor to find it a foot and a half-metre down the drain...remedy; stuck a bit of copper wire through the vent hole, like a super-hi-tek split pin without a split;- exhibit  'a'...... *wink2*

 and yup, the wire gauge is smaller than the hole so leaks a treat;

   and
Quote
There, I think there is no dedicated vent hole, but the button is no way sealed around the  button. That loose fit would seem to be enough to vent the bowl and I would guess the same for the carb in question. Am I wrong here?

 No Richard, you're dead right- leaks from anywhere  *smile*

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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Online RichardL

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Re: Tickler/Primer plunger
« Reply #9 on: 04.04. 2017 12:53 »
Dutch,

Is it actually possible to push the button rigged like that? Doesn't the plastic tube knock up against the nut?

Richard L.
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Online RichardL

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Re: Tickler/Primer plunger
« Reply #10 on: 04.04. 2017 13:52 »
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Offline duTch

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Re: Tickler/Primer plunger
« Reply #11 on: 04.04. 2017 20:10 »

  I might chase one of those up, but not sure how to attach it   *smile* ...there's about 1mm of travel before the plunger engages the float, and ~2-3mm overall- more than enough
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Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Online RichardL

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Re: Tickler/Primer plunger
« Reply #12 on: 04.04. 2017 21:31 »
I'm sorry to say I think I know what you mean by not knowing how to attach it, nevertheless, did you open the link?

That, I think, is much less travel than required for the concentric.

Richard L.
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Online ellis

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Re: Tickler/Primer plunger
« Reply #13 on: 04.04. 2017 22:16 »
With the float extension on the A10 it takes 4 seconds to fill and overflow the fuel. So I just count for 3 seconds to almost fill the float bowl and no stinky finger. Works every time.  *good3*

ELLIS
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Online Greybeard

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Re: Tickler/Primer plunger
« Reply #14 on: 04.04. 2017 22:32 »
What's the problem? Us greasy butch leather clad motorbikers are supposed to stink of oil and petrol. We aren't ponsy Mods on scooters!
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