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Type 3/4 carb setup.

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Type 3/4 carb setup.

Post  seipgam on Fri Jul 25, 2014 7:25 am

Hi all,
Trying to correctly set up the needle valve on my Ketsrel 66 (13D with type 3/4 carb).
Needle depth is listed as 2+13/32 below the bottom of the throttle slide. Do they mean the skirt of the throttle slide or the main body of it directly where the taper needle exits (the latter seems to make more sense to me).
Also, if I am compensating for wear over time, would I be looking to make the mixture slightly leaner (lower needle) or richer (raise needle).
Just to add - the float level measures correct at 7/32.

Thanks in advance - Geoff.


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carburettor setting

Post  piston 197 on Fri Jul 25, 2014 7:52 am

Geoff , the setting measurement is from the flat part of the bottom of the slide where the needle exits, the measurement I have is 2.41" ( which is similar to the 2 13/32" you quote") compensating for wear is a bit more tricky , if the slide fit is worn , it will most likely be sucking extra air and the needle will have to be raised to give more fuel to air balance, if the needle or needle jet is worn then the needle is likely to have to be lowered to compensate for the bigger fuel supply provided by this kind of wear. Suggest you set the air screw at 1 1/2 turns out from fully home, start at the nominal setting and then adjust needle to get the best running throughout the range,
JH
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3/4 carb settings

Post  seipgam on Fri Jul 25, 2014 8:34 am

Thanks John. you refer to the "air screw", do you mean the screw above the taper needle that adjusts it? as there are are no other adjustable screws. Does that make sense?

Regards -Geoff.
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air screw

Post  piston 197 on Fri Jul 25, 2014 9:22 am

Geoff yes , forgetting myself, the 3/4 has no air screw, tick over is set by cable adjustment, later carbs had an adjustable air screw, your 3/4 does not so disregard that part of the info, start needle length at 2.41 and adjust up/down to compensate for wear,
JH
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Type 3/4 carb

Post  seipgam on Fri Jul 25, 2014 9:32 am

That sets me on the right track. Will have a play over the weekend.
Your advice is much appreciated.

Regards- Geoff.
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Type 3/4 carb

Post  seipgam on Thu Aug 07, 2014 11:09 pm

Thanks John for the advice, have it running sweetly now.

Cheers, Geoff.
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Type 3/4 carb setup

Post  PeterW on Sat Aug 08, 2015 6:54 pm

Iím in the process of setting up the Villiers type 3/4 carb on the 13D engine in my 1953 Kestrel 66.

Iíve taken Johnís advice and set the adjusting screw one and a half turns out from fully in and am finding that this gives a measurement of approx. 2.41 inches from the tip of the needle to the castellated part at the extreme bottom of the slider, (not the flat area surrounding where the needle emerges). - Is this correct?

Also, am I correct in fitting the needle spring with the smaller part of the taper under the needle head?

Many thanks for any advice.

Peter

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needle measurement

Post  piston 197 on Sat Aug 08, 2015 7:57 pm

The needle measurement should be measured from the flat part of the slide from where it emerges from the slide , the one and a half turns out refers to the air screw not the needle measurement, on the 10D 125cc is 2.41" inches, I do not have a figure for the 13D, but as it is a 125 also and uses the same carb , it would seem a safe starting place ?
JH
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Re: Type 3/4 carb setup.

Post  PeterW on Sat Aug 08, 2015 8:06 pm

piston 197 wrote:The needle measurement should be measured from the flat part of the slide from where it emerges from the slide , the one and a half turns out refers to the air screw not the needle measurement, on the 10D 125cc is 2.41" inches, I do not have a figure for the 13D, but as it is a 125 also and uses the same carb , it would seem a safe starting place ?
JH

Thanks John, I was thinking that was the case - Just wondering why Iím getting a measurement of rather more than 2.41?

Where is the air crew on the type 3/4? - Cant see one on my carb!
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air screw

Post  piston 197 on Sun Aug 09, 2015 4:34 am

Peter, sorry you do not have an air screw on the 3/4 lightweight, these came in later on the s19 etc as fitted from 1955 onwards
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Re: Type 3/4 carb setup.

Post  bessybarnett on Sun Aug 09, 2015 6:41 am

Good morning John.

Good day at Brooklands yesterday.

This set of threads is useful for me too as I also have a 66 in pieces! Thanks.

Pete (Another PeteW!)

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Re: Type 3/4 carb setup.

Post  seipgam on Sun Aug 09, 2015 9:57 am

Hi Peter,

I will check the settings on mine (Kestrel 66 - type 3/4) tomorrow and post them.
This should give you a good starting point.

Regards, Geoff.
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Re: Type 3/4 carb setup.

Post  PeterW on Sun Aug 09, 2015 4:39 pm

seipgam wrote:Hi Peter,

I will check the settings on mine (Kestrel 66 - type 3/4) tomorrow and post them.
This should give you a good starting point.

Regards, Geoff.

Thanks Geoff, that will be very helpful.

Cheers,

Peter
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Re: Type 3/4 carb setup.

Post  PeterW on Sun Aug 09, 2015 4:42 pm

bessybarnett wrote:Good morning John.

Good day at Brooklands yesterday.

This set of threads is useful for me too as I also have a 66 in pieces! Thanks.

Pete (Another PeteW!)


Must be something about the name PeteW! - How's you refurbishment going?

Cheers,

PeterW
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13D 3/4 carb setup

Post  seipgam on Mon Aug 10, 2015 9:29 am

Hi Peter

The Villers 13D engine book gives a little more detail than the FB Kestrel 66 book.
Standard settings are-
Float level 7/32" below underside of main carb body.
No.3 taper needle set at 2+13/32" below under side of throttle slide (not the outer skirt section)
Small tapered end on needle spring goes up - to head of needle.

The only alteration from standard I have made is needle set to 2+1/2"
It took many fine adjustments to come up with the best setting for my machine as I'm sure it will with yours.
Using 25-1 (as opposed to 20-1 back in the day) fuel mixture as suggested to be used on this forum with modern 2 stoke oils. This thinner mix may go some way to explain the lower needle setting, plus maybe a bit of wear and tear in the carby.

A couple of other things to note- I have replaced the coil, lead, plug and fitted a Brightspark Easycap condenser which have also helped with the general running of the bike.
The new coil in particular made a big improvement.

Hope this is of some help and perhaps let us know how you get on.

Cheers, Geoff.

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Re: Type 3/4 carb setup.

Post  PeterW on Mon Aug 10, 2015 10:28 am

Thanks very much Geoff - Very useful & helpful info.

Cheers,

Peter
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Re: Type 3/4 carb setup.

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