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D14 Throttle Slide Wear - Photos attached - Is this ok?
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coxy46
Nottingham
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August 12, 2019 - 3:08 pm
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Hi,

I'm new here, just purchased a 1968 D14.

 

Good news it starts. Bad news is it will bog and then die once I open the throttle. I suspected the choke cable not fully lifting the air slide as the cable was really loose and fell out when you turn the handlebar air lever, so when it turns fully tight it's not actually lifting it fully. I ordered a new choke cable as the original one the end ferrule was all broken and the outer cable was probably too short, so I had to remove the throttle slide.

Long story short this is what I have.

Carb1-Small.jpgCarb2-Small.jpgCarb3-Small.jpg

 

I take it the carb wasn't all new, is the throttle slide wear excessive? Does this need replacing? - The engine side does not have a step in it at all and is smooth.

 

Regards

Greg.

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Coxy46 (Nottingham - England)

1968 Bantam D14/4

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Stoo63
GLASGOW
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August 12, 2019 - 7:37 pm
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Hi Greg and welcome. D14 isn't my area but I'm sure some of the brains on here will be along to help you out soon.

Good Luck

Stewart

'52 D1 direct lighting plunger, '58 Square Four (project), '59 D1 direct lighting plunger,  '59 Tiger Cub, '60 5TA,  '76 FS1-E

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cocorico
Central France
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August 12, 2019 - 8:32 pm
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Have you checked that the exhaust is not partially blocked?

1956 D3 running, lights to sort. 7 other bikes in the Barn, including a Morini 250 now insured and on road testing.

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johnsullivan
east sussex
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August 12, 2019 - 9:28 pm
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Remember the choke is off when the lever is pointing at you.The slide could be better but its not U/S.

67 D10. and a D7    2007 Honda Hornet FA. Honda CD200 81 93 Yamaha TTR 250 Raid, Sinnis SC 125.   75 Montesa Cota 247 an electric scooter of Famous make.

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Lone Wolf
The Black Country
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August 13, 2019 - 2:00 am
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Wotcha.

The slide on my D14 used to rattle about when on tickover.  You would have sworn it was a small end gone.

I had the carb reconditioned and a brass slide fitted, along with a "Premier" pilot jet.   Cost me around £56 if I remember correctly.

^..^

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coxy46
Nottingham
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August 13, 2019 - 8:48 am
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Thanks guys for your quick responses. Good news on the slide. Once I get the new cables I'll refit and give it a whirl.

To confuse matters the air lever on my bike has a left handed lever on the right hand side, so everything is in reverse.

I am right saying though that when the choke cable is at it's tightest (being pulled) that's the position it needs to be in when warm and running (i.e choke off)??

Coxy46 (Nottingham - England)

1968 Bantam D14/4

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SpacedMarine
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August 13, 2019 - 10:23 am
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coxy46 

I am right saying though that when the choke cable is at it's tightest (being pulled) that's the position it needs to be in when warm and running (i.e choke off)??  

Yes the cable pulls the slide up and out of the way.with the air filter off turn the choke off(pull cable tight)open the throttle fully and check the choke slide is all the way up so your getting full power at full throttle.If I pull mine too far the slide sticks so I have put a sharpie mark on the lever where I know the choke is fully open and wont interfere with the throttle operation.I actually had to take a bit of emery cloth to my slide as I think the bore was slightly oval due to over tightening at some point and it kept sticking.

What's 7/16 in mm again?

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Ringting
Newport Pagnell
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August 16, 2019 - 10:23 pm
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It looks quite worn to me. That'll weaken your mixture at small throttle opening. I'd try lifting the needle by putting the clip in the bottom groove to richen it up a bit.

Alan. 

D1, D14/4, Guzzi LeMans, Triumph Trident 900, Maserati 160 t4. Mk1 Mini Traveller, Berkeley T60.

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coxy46
Nottingham
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August 19, 2019 - 11:26 am
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All new cables on and after tweaking the Carb Throttle stop screw, it is idling nicely at around 1100 rpm and also revs without bogging (so reckon it was the choke not moving high enough in the carb when it was turned off). Not got it warm yet or taken it for a spin as I need to attend to some front brake issues and then rewire the whole bike (nothing part from the starting circuit is wired in), so there are probably going to be a few more problems to iron out once on the road. But that's for another day.

Thanks for all your help. ( I am sure I'll be needing more help soon!).

Coxy46 (Nottingham - England)

1968 Bantam D14/4

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