Potential source of new Carb jets

[Laverda Dave]

There’s been a lot of discussion recently regarding various replacement carburettor jets etc.
I came across a new company called KMT Products who are based in and manufacture in the UK. I contacted them to see if they manufacture parts for sohc Honda Keihin carbs. This is the response I got back, seems pretty encouraging.
Discalimer - I have no affiliation to this company and haven't used any of their products but thought it worthwhile to contact them.

Hi, Dave.
 
We manufacture more than 250K main and pilot jets in the UK per year, as listed on our website, at our manufacturing facility in Northamptonshire on high precision Swiss multi-axis CNC lathes to a high degree of accuracy.
 
Regarding the quality:-
All centre-line tooling is clocked to within 5 microns of the spindle axis, and only after the machines are warmed up with a preheat cycle. All the ID numbers are engraved instead of being stamped, using a high frequency spindle running at 40K rpm. The parts are inspected on setup, during manufacture, and after degreasing in our solvent plant with an ultrasonic recirculation submersion cycle. This is followed by a vapour cycle, which slightly passivates the surface. After this the jets are blasted with high pressure air to remove any swarf particles that may still be left. They're then counted to ensure none are missing or have been cross-contaminated (highly unlikely) by verifying with the machine counter. We then sub-divide each batch into lots of 50 to sample check for size, thread and that the bores are visually clear using magnified lenses. They are then sealed in airtight bags and stored in a dry clean room ready for packing and shipping.
As the tooling is clocked up to the centre line of the spindle, and we use high precision ground carbide tooling, machining them with thin high grade centistock neat cutting oil, we get the accuracy and surface finish to ensure the quality. On initial first off/setup, and during manufacture we take a sample of jets to check internal surface finish by sectioning as additional measure. So, I hope this gives you the confidence in the quality that you can expect us to provide.
 
We don’t make the full range of Mikuni or Keihin main or pilot jets but we make the most popular types.
We are looking to increase the range by making others such as the Mikuni types N208.099 press/push in main jets VM28/213 pilot and Keihin N424-22 & 24 Pilot jet, or other types possibly in the next year or so. Other than that we would need to see exactly what types are required for the SOHC Honda you have listed, and come back to you once we have done our research.
 
We, as of yet, do not manufacture float needles but may consider doing so in the future, along with needle jets both of which require a lot of research and additional specialised equipment. We will continue to increase the types of jets we produce, as already mentioned, but only after we can the stock full range of sizes. I hope this help to furnish you with our capabilities and alleviate any uncertainties about the quality of our jets.
 
Thank you for taking an interest in our company and being prepared to mention us on the SOHC site. I will come back to you once I have more information.
 
Kind regards,
 
KMT Products

 

[McCabe-Thiele (Ted)]

Interesting Dave with potential future products becoming available.

[Rozabikes Tim]

Wow that's a very full spec description and must have taken some time to do. Cant ask for more and yes very promising.

[taysidedragon]

Sounds good! 👍

[Laverdaroo]

Good shout Dave, interested to see what comes of this. Super interesting write up bless him, what a guy


Sent from my iPhone using Tapatalk

[Johnny4428]

Just read this, looks very promising, and nice web site too!

[SteveD CB500K0]

Try their website on a phone.


Sent from my iPhone using Tapatalk

[Matt_Harrington]

A British company with Swiss machines and accurate tooling and decent inspections - these parts will be good!!

[AshimotoK0]

A local guy who restores CB400F carbs asked ne if I had any spare 75 Keihin used jets (sadly I didn't) but it made me think you could buy pattern ones of dubious jet bore size with a smaller jet hole and precision ream them to the correct size. Or am I talking b*llocks.

[Matt_Harrington]

Ash, no reason why not - I s'pose a decent micro reamer would be pricey? You can get jet reamer sets BUT they are clock bushing type reamers (tapered) and, IMO, not up to the job.

[Laverda Dave]

It would be great if they were to make the float valves with a viton tip (sod originality I want something that doesn't leak!). Every problem I have ever had with 400/4 carbs has always been leaky float valves!