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D14/4 Mikuni Carb
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Jamy
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February 22, 2021 - 11:33 am
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Hi,

I'm new to British bikes and have owned a 1968 D14/4 since early this year. Despite much searching through previous posts, FAQ and Google, I've yet to find a Japanese Mikuni Carb for sale that I'll be happy to purchase for my bike. 

Rex Caunt has some for sale as follows and I've found his store to very good so far.

1   £88.20-Mikuni VM70-273. This has a flange that looks as though it will bolt directly to the head.

2   £123.75-Mikuni VM26 Trials, with a round flange that will need an adaptor to fit to the head.

3   £123.75-as above but a Road version.

Can anyone tell me which of these will suit my bike best? I want an easy to start and reliable bike that I won't have to push home (again) due to carb issues. I'm getting too old for that!

Why would I pay for the £123.75 unit and then have to purchase an adaptor when it looks as though the cheaper carb will bolt straight on?

Regards, Jamy.

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mike1949
West Sussex
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February 22, 2021 - 3:18 pm
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Hello, I've just gone through the same process with my Bantams and my observations are as follows. The D10 onwards used a 26mm carb with a flange mount ,up until last year Rex Caunt used to supply a Mikuni with a 26mm bore and a flange mount but I believe that Mikuni have stopped making them (carb size is measured at the flange  not the inlet) so he now supplies spigot fitting carbs with an addaptor to fit them. The cheaper carb on his list is for an earlier model bantam and is a smaller bore but having said that my d14 goes perfectly well on a 24mm Mikuni copy got from India (its what is used on a 350 Enfield Bullet) with a 150 main jet. If you want any more info let me know.

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Stoo63
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February 22, 2021 - 6:48 pm
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Hi Jamy and welcome to the Club and the Forum. It's a help for everyone if you do a little intro in the Introduce Yourself section  - makes life easier if users know the experience of the person they're dealing with. - and it's nice and social 🙂

Any issues , let me know,

All the best,

Stewart

 '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA;  '76 FS1-E; '91 GTR 1000;  '97 Honda Sky SGX50.

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SpacedMarine
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February 22, 2021 - 9:49 pm
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Or for the price of the mikuni and the adapter just buy a brand new concentric fit and forget.Maybe fit a larger main and pilot jet to compensate for the ethanol in modern fuels as discussed recently 👍🏼

What's 7/16 in mm again?

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Jamy
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February 23, 2021 - 8:45 am
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Thanks Mike for the very useful information and to the others who contributed.

Having cleaned my Amal carb to within an inch of its life, I reckon it's the minute idle circuit passageways that cause problems. This is why I am going the Mikuni route. 

As for introducing myself, I will do that.

Thanks again!

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Lone Wolf
The Black Country
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February 23, 2021 - 8:29 pm
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Jamy said

Having cleaned my Amal carb to within an inch of its life, I reckon it's the minute idle circuit passageways that cause problems.

Wotcha.

Have you tried boiling it in washing powder ?

Sounds silly, but the boiling action "shakes" everything about and the washing powder shifts dirt from all the nooks and crannies.

It works for me.

^..^

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Number6
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February 23, 2021 - 9:15 pm
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http://livinginthepast-audioweb.co.uk/imagex/misc/like-button2.jpg

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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dimitris
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February 24, 2021 - 6:54 am
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Lone Wolf said

Wotcha.

Have you tried boiling it in washing powder ?

Sounds silly, but the boiling action "shakes" everything about and the washing powder shifts dirt from all the nooks and crannies.

It works for me.  

Hi. Does the ultrasonic cleaning has the same effect?

BSA D1, 125cc (1952)---BSA D10 Sport 175cc (1967)---Triumph Cub T20 (1960)

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Jamy
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February 25, 2021 - 10:37 am
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Thanks Lone Wolf, I'll give that a try if it starts misbehaving again. At the moment it's playing nicely!

An engineer friend of mine said to soak it in cellulose thinners for a day or so. I did that and blew out everything with an airline and so far it's all good. 

I still fancy a bit of Japanese reliability though. I'll let you know how I get on when I take the plunge.

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GlenAnderson
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February 25, 2021 - 1:39 pm
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Mikuni carbs have minute idle passageways too... just sayin’...

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cocorico
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February 25, 2021 - 2:42 pm
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GlenAnderson said
Mikuni carbs have minute idle passageways too... just sayin’...  

But then again, most have oil injection, too, so no risk of oil in the carb to block them. thinking

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Lone Wolf
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February 25, 2021 - 4:01 pm
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dimitris said

Hi. Does the ultrasonic cleaning has the same effect?  

Wotcha.

I've had carbs cleaned in an ultrasonic unit ( friend of mine  has one large enough for a bank of four carbs ) and it didn't seem to do the job.

Same carb had a good boiling and it was fine . . . . MZ 250 if you must know 🙂

^..^

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mike p5xbx
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February 25, 2021 - 4:03 pm
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GlenAnderson said
Mikuni carbs have minute idle passageways too... just sayin’...

cocorico said
But then again, most have oil injection, too, so no risk of oil in the carb to block them. thinking  

but then again again, they dont have 50+ yearold petrol tanks full of rust
imho that is what causes the most problems with carbs smile

D? - D10- D14 Bantams 350 AJS -500 Triumph http://bsanotru.....lfire.com/

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