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What keeps throttle valve/needle in the jet holder #769766
04/01/19 1:06 am
04/01/19 1:06 am
Joined: Mar 2019
Posts: 13
North Bay, ON, CA
M
Mr Kym Offline OP
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Mr Kym  Offline OP
BritBike Forum member
M

Joined: Mar 2019
Posts: 13
North Bay, ON, CA
Hi Again,

You have all been great the last couple of threads and hopefully this is the last post for a while. Bike finally ran for a little bit (15 seconds) but the throttle goes both full motion forwards and backwards past where the throttle should stop. The throttle pulled the throttle valve and needle out of the needle jet. Good thing the bike wasn't running or the throttle would have been stuck wide open. Is this just an adjustment in the cable or is there a stop on the carb thats missing? Is there a screw tbat should stop the throttle valve from moving past a certain point? I tore the carb apart and everything looks to be right according to the Hayne's manual.

There is a hole on actual throttle, maybe a half inch from where the cable goes in, should there be a set screw there that stops the handle from going past the 12 oclock mark?

All of the problems with this bike have been really quirky!!! Learned alot about it the last 3 days. Glad you guys are around and Thank You for all the help.


Last edited by Mr Kym; 04/01/19 2:02 am. Reason: added info
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Re: What keeps throttle valve/needle in the jet holder [Re: Mr Kym] #769776
04/01/19 2:55 am
04/01/19 2:55 am
Joined: Aug 2001
Posts: 4,721
Owego, NY, USA
Mark Z Offline
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Mark Z  Offline
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Joined: Aug 2001
Posts: 4,721
Owego, NY, USA
It's normal for the cable to pull the throttle slide and jet needle out of the needle jet, but it should drop back down in when you let go, by dint of the spring above the slide.

As I wrote in your other thread, it sounds like your throttle slide or throttle cable is sticking.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: What keeps throttle valve/needle in the jet holder [Re: Mr Kym] #769784
04/01/19 5:17 am
04/01/19 5:17 am
Joined: Oct 2008
Posts: 5,421
Crossville, TN
DavidP Online content

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DavidP  Online Content

BritBike Forum member

Joined: Oct 2008
Posts: 5,421
Crossville, TN
Originally Posted by Mr Kym
Hi Again,

There is a hole on actual throttle, maybe a half inch from where the cable goes in, should there be a set screw there that stops the handle from going past the 12 oclock mark?

Yes, there should be two screws in the throttle housing. One is the throttle stop, the other sets tension on the throttle action. Both screws have lock nuts to keep them in place once adjusted.
I haven't seen your other post, but it does sound as if your slides are sticking. That's very common with these old carbs. Remove the air filters and have a look to see if the slides return to bottom once you release the throttle.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"

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