The Sensible Twin

[husaberg]

Never say never, LOL. But I do have to test it to sort the carburation.
I try and ride everything that comes through the workshop.
As it's set up now, I'd reckon to hit the bumpstops a lot on the "private test track"

I am sure it cause you are far far taller old chap, rather than you just have hit the eggnog to hard.

Carbs are amazingly sophisticated pieces of simple crude technology, in that its set up for a engine twice the size, one that also fires half as often, yet it still starts and likely will run also on the original settings.
it will be interesting to see if the FCR or PWK Needles fit.

[Grumph]

it will be interesting to see if the FCR or PWK Needles fit.

Don't have either in stock. Have tried for size everything here from VM's to old Honda CB Keihins to RS Mikunis.
They're an orphan length. They have very little taper at all so at least if it's lean on the needle, there's room to move.

[husaberg]

Don't have either in stock. Have tried for size everything here from VM's to old Honda CB Keihins to RS Mikunis.
They're an orphan length. They have very little taper at all so at least if it's lean on the needle, there's room to move.

Yeah a bit of sand paper and a vernier.
we used to use a unimat model lathe

its amazing what people still pay for them but they used to do up to about 70mm

never used the tool to trim just paper but you could set it up exactly where you wanted to thin out

[F5 Dave]

Bit of 80 grit on the battery drill ideally when you're drunk.

[Grumph]

Bit of 80 grit on the battery drill ideally when you're drunk.

Remember, I used to be the alcohol fuel guru for a lot of roadracers - won't be my first set of needles hand modified.

Going to reclaim the tank from the welder today and make some more bits for it.

[Grumph]

In town today and reclaimed the tank. Took the float bowls to Seal Imports Ltd - who supplied the correct O rings off the shelf for the bowl gasket...

At a total cost of $7.00 the pair.....Beats hell out of doing it on line, LOL. Not the first time they've come through for me. Highly recommended.

[Drew]

Seal imports are fucken awesome. They've had seals made for me before.

[husaberg]

In town today and reclaimed the tank. Took the float bowls to Seal Imports Ltd - who supplied the correct O rings off the shelf for the bowl gasket...

At a total cost of $7.00 the pair.....Beats hell out of doing it on line, LOL. Not the first time they've come through for me. Highly recommended.

Genuine 39 pounds on the fiche for one off a NSR including a tiny one for thefuel drain or something, a top gasket, plus the slide side gasket that's each FFS.

on the plus side the needle jet is replaceable this is about the same price which is at least a bit more resaonable.
the holder is also replaceable but only 2t
this is the pic from the early NSr from memory your carbs were either of a NS400 or NS250? is that right?



oddly the similar carbs off the MVX250 seem to have very 4t PWK or other Keihin looking needle jets holder according to the pics in the fiche?
https://www.cmsnl.com/honda-mvx250f-.../#.XNMcvY4zaUk

that also is the same part number as
CB1000C 1000 CUSTOM 1983 (D) USA
CB1100F 1983 (D) ITALY
CB1100F SUPER SPORT 1983 (D) USA
CB1100RBI AUSTRALIA (13MA3B24)
CB1100RBII FRANCE ENGLAND GERMANY NETHERLAND GENERAL EXPORT
CB1100RCII AUSTRALIA ENGLAND FRANCE GERMANY NETHERLANDS
CB1100RDII AUSTRALIA ENGLAND FRANCE GERMANY NETHERLANDS
CB650 1981 (B)
CB650 1981 (B) CANADA
CB650 1981 (B) USA

so its a 4 emulsion type holder at least on the MVX250.

Didnt drew have a bro or something with MVX parts?

looking a the NS250 fiche they are very generic looking holders and are emulsion type

[Grumph]

They're MC16 type carbs. The first and simplest version without solenoid air bleeds - thank christ.
Nothing in them looks unusual. I'm quite capable of making jets incl the needle jet if it has to go leaner.
Float needles are good, they are in quite good nick generally.
All I've had to do is transfer the fuel inlet from the right to the left end of the fuel gallery.
That was easier than cutting a hole in the frame rail....

[husaberg]

They're MC16 type carbs. The first and simplest version without solenoid air bleeds - thank christ.
Nothing in them looks unusual. I'm quite capable of making jets incl the needle jet if it has to go leaner.
Float needles are good, they are in quite good nick generally.
All I've had to do is transfer the fuel inlet from the right to the left end of the fuel gallery.
That was easier than cutting a hole in the frame rail....

that one i posted first was MC16 as were the prices.
Bloody intersting the MVX has 4t parts in it.

[jellywrestler]

that one i posted first was MC16 as were the prices.
Bloody intersting the MVX has 4t parts in it.

about the only interesting thing about an MVX.....

[husaberg]

about the only interesting thing about an MVX.....

Nah its an unusal bike hamstrung by a weird decision to use cast iron cylinders and believe it or not head covers as well. As well as some other unusuaf borrowing parts from other bikes.
The balancing arrangement is also quite unusual, kind of like a twin balancing a heavy pistoned single its a corperste oddidy built just because of Freddie.
Far more common in NZ than anywhere else in the world i believe.

[Grumph]

Far more common in NZ than anywhere else in the world i believe.

Probably offered at a price Bluewing couldn't refuse - to get shot of remaining stock in Japan.
Wouldn't be the first - or last time - we were a dumping ground.

[jellywrestler]

Nah its an unusal bike hamstrung by a weird decision to use cast iron cylinders and believe it or not head covers as well. As well as some other unusuaf borrowing parts from other bikes.
The balancing arrangement is also quite unusual, kind of like a twin balancing a heavy pistoned single its a corperste oddidy built just because of Freddie.
Far more common in NZ than anywhere else in the world i believe.

story goes we got em cheap as they were destined for the crusher as they were so poor.
remember at the time they were approx $3454 the yammys were $4 and the rg gammas were $5400, vast difference between 3 x 250's really

[F5 Dave]

I remember the lines of them parked outside Sawyacomings and Honda Chitty. Buy a VF, get 2 of these thrown in or whatever.