Bl**dy so called specialist suppliers for mororcycle carb parts

[minimutly]

Stripped the vmax Mikunis over a week ago - it had developed a nuisance weak mix misfire on one cylinder, and I haven't used it for a while due to not getting a round tuit.
So stripped down, the old petrol smell told me it was needed. The downdraght Mikunis have a jet block that screws to the carb body, paper gasket needed. Also, the main jet emulsion tube and idle jet have a bung each that needs replacing. A bit of internet searching, and failing found a German supplier, and one other in the UK, who sold them as part of a "kit". Anyway, they turned up last week, looked fine. Went to fit them today and the bungs are useless, one is too squidgy, the larger one is just plain too big.
So you could day I'm a bit peed off - why do people buy rubbish and resell it as something it plainly isnt?

 

[Martin Hocking]

Allens used to be good, they hooked me up with some vacuum seals for some zxr250 keihins which weren’t available off of any shelf I knew of. Mind you I had to pay fat wedge for the privilege.

Or are they the baddies?

I’m pretty sure they changed ownership between now and then.

 

[minimutly]

No, this is a small time specialist, I actually rang and spoke to the "director", nice bloke, proper engineer - it just seems he doesn't check out the kit.
So can I make my own plugs - what material has some give, can be machined, but is not affected by modern fuels? Maybe ptfe?

 

[Greeves246]

Try speaking to “ H “ at Exactrep

EXACTREP

Specialists in Vmax motorcycle parts, cast metal, moulded plastic spares & accessories

exactrep.com

 

[oldbikedavey]

Oi ! Did you get those photos ?
Knock once for yes, and twice for no....

 

[minimutly]

Try speaking to “ H “ at Exactrep

EXACTREP

Specialists in Vmax motorcycle parts, cast metal, moulded plastic spares & accessories

exactrep.com

Thanks - they don't list them, but I'll ring them - hard to believe how something so essential is not available anywhere..

 

[minimutly]

Oi ! Did you get those photos ?
Knock once for yes, and twice for no....

Yes, just been too busy to look through them properly - thanks!

 

[Greeves246]

I used to have two VMax at one point, one with an Exactrep 17” back wheel to fit decent tyres, Ohlins rear shocks, Hyperpro fork springs with Gold Emulators, R1 brake calipers front and rear, frame braces, and so on. Handled really well, surprised a few sports bikes.

 

[Martin Hocking]

….
So can I make my own plugs - what material has some give, can be machined, but is not affected by modern fuels? Maybe ptfe?

View attachment 467976

Could you make them out of something like nylon to take an o ring? Pop a blind hole in the bung end to give a bit of flex?

 

[dobbslc]

Have a look at these, No 44 & 46?
I've used Fowlers on and off for years and they are a decent company.

CARBURETOR - Yamaha VMX12 VMX12F V-MAX (3JPE, 1994) 010 A | Yamaha VMX12 VMX12F V-MAX (3JPE, 1994) 010 A 1994 CARBURETOR supplied next day (UK only) by Fowlers Parts

Yamaha VMX12 VMX12F V-MAX (3JPE, 1994) 010 A | 1994 | Dark violet cocktail 1 | Europe | CARBURETOR supplied next day (UK only). Available at Fowlers Parts, the UK's No.1 Motorcycle Parts Supplier.

www.fowlersparts.co.uk

Edit: obviously put you own bikes details in as I just did a general VMax search.

 

[minimutly]

Thanks, I saw the fowlers ones, truth is the kit I ordered had the plugs and gaskets and a few other bits.
I've contacted the supplier and he's looking into it.

 

[Keithmac]

NRP carbs are good. I only use Keyster (Japanese) rebuild kits unless they are not available.

Last Yamaha I did with the bungs I'm sure I ordered OEM from Fowlers (postage is a killer though).

 

[Keithmac]

Keyster are excellent, Tourmax are passable for fuel needles.

Abax EBC for jets (made in UK).

Anything else is a crapshoot from my experience..

 

[roofman]

Stripped the vmax Mikunis over a week ago - it had developed a nuisance weak mix misfire on one cylinder, and I haven't used it for a while due to not getting a round tuit.
So stripped down, the old petrol smell told me it was needed. The downdraght Mikunis have a jet block that screws to the carb body, paper gasket needed. Also, the main jet emulsion tube and idle jet have a bung each that needs replacing. A bit of internet searching, and failing found a German supplier, and one other in the UK, who sold them as part of a "kit". Anyway, they turned up last week, looked fine. Went to fit them today and the bungs are useless, one is too squidgy, the larger one is just plain too big.
So you could day I'm a bit peed off - why do people buy rubbish and resell it as something it plainly isnt?

The Vmax carbs are the weak link on them bikes, had mine in an ultra sonic for 2 days and it did nothing, then spent a whole day with miniature pipe cleaners,air line and cleaned out every hole,jet and orifice to an inch of there life. It was the only time the Vmax run right after this intense cleaning.

 

[oldbikedavey]

I'm told that Amal taught Mikuni everything they knew.
But far from everything that Amal knew....

 

[minimutly]

The Vmax carbs are the weak link on them bikes, had mine in an ultra sonic for 2 days and it did nothing, then spent a whole day with miniature pipe cleaners,air line and cleaned out every hole,jet and orifice to an inch of there life. It was the only time the Vmax run right after this intense cleaning.

Yeah, lots and lots of little passages. The ones I have were a mismatched set from ebay, with seized mixture screws thrown in. I had to machine one out, make an insert, press and glue it in. Suprisingly, it worked!
With the original, well butchered set the engine would start, run for 3 seconds then stop. I eventually worked out that the fuel was flooding into the cylinders whilst sitting, so it was getting a gobful on first turn.

 

[dobbslc]

I'm told that Amal taught Mikuni everything they knew.
But far from everything that Amal knew....

They should have had a word with Dell'Orto while they were offering advice...