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73 thing not getting full throttle
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Krochus
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PostPosted: Wed Apr 03, 2019 5:53 pm    Post subject: 73 thing not getting full throttle Reply with quote

I am running through the checklist of items to get my thing on the road and I’ve gotten to the throttle cable part. After a bunch of compressed air and Pb blaster forced through the throttle cable tube it’s freed up nicely.

Since I recently had the carb off I had to adjust the slack in the throttle cable so the throttle can just close fully with the accelerator pedal released.

Now here’s the puzzler with the pedal fully depressed I’m probably only getting 60% throttle opening if that. It’s nowhere even close! I could understand losing a little from a worn pedal but this seems like a lot
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YDBD
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PostPosted: Thu Apr 04, 2019 3:05 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

picture of both the accelerator arm for the pedal and the carburetor would help.

stock PICT 34?

Maybe the pedal arm (not the pedal) is not going as far as it needs to with the pedal
Maybe there is another hole on the pedal arm that is further up that you can use
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Krochus
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PostPosted: Thu Apr 04, 2019 5:06 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

As best I can tell everything is stock.

This pic is with the pedal pulled back for viewing


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Image may have been reduced in size. Click image to view fullscreen.

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YDBD
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PostPosted: Thu Apr 04, 2019 5:33 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

when you push the pedal lever all they way down what is stopping it?
Look at the lever where it is connected to the base, there is a little finger stop sticking out, is there anything blocking that from hitting the base?
And you can also pull that out and cut the finger off too.
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HMVWNAB
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PostPosted: Thu Apr 04, 2019 5:58 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

To check cable slack, loosen the cable from the arm, pull cable end towards you with needle nose pliers while holding arm back against stopping point in opposite direction to take slack out. Retighten.
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Krochus
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PostPosted: Thu Apr 04, 2019 6:15 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

HMVWNAB wrote:
To check cable slack, loosen the cable from the arm, pull cable end towards you with needle nose pliers while holding arm back against stopping point in opposite direction to take slack out. Retighten.
Image may have been reduced in size. Click image to view fullscreen.


The cable is as tight as it can be for the throttle to be able to return to idle. There’s not anything close to enough slack to lose 50% of the throttle opening
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Krochus
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PostPosted: Thu Apr 04, 2019 6:17 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

YDBD wrote:
when you push the pedal lever all they way down what is stopping it?
Look at the lever where it is connected to the base, there is a little finger stop sticking out, is there anything blocking that from hitting the base?
And you can also pull that out and cut the finger off too.


I’ll check in on that. If I actuate the roller lever instead of the pedal I only get slightly more travel if any extra at all.


I compared the throttle assembly to the one on my bug and they both look identical as far as cable placement
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74 Thing
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PostPosted: Thu Apr 04, 2019 6:53 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

The cable is hung up somewhere and you have to get under the car. Between the tranny area and the front of the engine above the tranny the cable runs and it is in a rubber, flexible throttle cable tube...http://vwparts.aircooled.net/Throttle-Cable-Bowden-Tube-1966-Type-1-131721551-p/131-721-551.htm

Make sure that is not pinched anywhere (usually happens where it connects to the body near the shift linkage or where it goes over the tranny and into the back of the fan shroud.
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HMVWNAB
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PostPosted: Thu Apr 04, 2019 7:36 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

Try running the cable through the lower hole on your fan shroud for more play.
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74 Thing
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PostPosted: Thu Apr 04, 2019 7:39 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

WTH-there are two holes in your fan shroud.
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Krochus
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PostPosted: Thu Apr 04, 2019 7:46 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

74 Thing wrote:
WTH-there are two holes in your fan shroud.


Who knows why the previous half a century of previous owners did what.

Case in point
Image may have been reduced in size. Click image to view fullscreen.

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HMVWNAB
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PostPosted: Thu Apr 04, 2019 11:41 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

Krochus wrote:
74 Thing wrote:
WTH-there are two holes in your fan shroud.


Who knows why the previous half a century of previous owners did what.

Case in point
Image may have been reduced in size. Click image to view fullscreen.


Fits so it must go there, right? Very Happy
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PostPosted: Thu Apr 04, 2019 12:12 pm    Post subject: Re: 73 thing not getting full throttle Reply with quote

If you count jammed in crooked partially crossthreaded as “fitting”
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PostPosted: Sat Apr 06, 2019 8:01 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

pull the cable out all the way through the barrel connector on the carb and tighten it as far as you can to the very end of the stiff part, that will get you more throttle
I can see your only about half way thru
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HMVWNAB
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PostPosted: Sat Apr 06, 2019 8:28 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

[email protected] wrote:
pull the cable out all the way through the barrel connector on the carb and tighten it as far as you can to the very end of the stiff part, that will get you more throttle
I can see your only about half way thru


Pointed out that cable path is not correct. Using a shroud hole above throttle arm instead of one below it so the cable slack is being taken up at the bend.
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PostPosted: Sat Apr 06, 2019 8:44 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

Except for the fact that it IS in the correct hole presently
If he used the lower hole it would get a lot worse and eventually break the cable... also it would hit the top of transmission when the throttle tube went through the front of the engine.
The lower hole is for the spark plug wires holder
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PostPosted: Sat Apr 06, 2019 8:49 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

He might consider a throttle cable shortening kit
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PostPosted: Sat Apr 06, 2019 10:51 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

[email protected] wrote:
Except for the fact that it IS in the correct hole presently
If he used the lower hole it would get a lot worse and eventually break the cable... also it would hit the top of transmission when the throttle tube went through the front of the engine.
The lower hole is for the spark plug wires holder
Image may have been reduced in size. Click image to view fullscreen.


My own throttle cable opening is clearly below the plane of the accelerator arm,even using an aftermarket carb.

His appears to be parallel or even higher than the arm. So my suggestion to use lower hole would create the path that I am used to seeing and provide more slack.

Maybe the shroud isn’t seated correctly and is riding higher than normal.

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PostPosted: Sat Apr 06, 2019 10:59 am    Post subject: Re: 73 thing not getting full throttle Reply with quote

it looks like the throttle tube is not secured in back of the shroud

he could also be missing the accelerator flexible guide tube altogether

from the chassis to the engine

if the accelerator guide tube is there it probably isnt mated with the throttle tube
This might also cause the problem
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