SOHC.co.uk Forums > CB500/550

Jet size

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Sesman:
Absolutely Murf.

It certainly demonstrates why a small change in jet size can have a significant effect on fuel flow and engine performance. Eg a reduction in jet size from say 100 to 98 results in approximately 4% reduction in fuel flow. Though I’m betting that the relationship between jet size and change in mixture is not completely linear. I guess it’s something developers establish empirically, thus making it a ‘mixture’ of science and art🫣.

TBH it must be a real headache as other factors relating to the general condition of the engine and carburettor package could have a greater impact on engine performance than a small change in jet size, hence the need for experimentation.

Sesman:
Have you tried NRP Manchester?

There is also an outfit in Canada…I can’t recall the name, but their website used have two impressive pairs🫣

Sesman:
Also Allen’s performance….

https://prod.allensperformance.co.uk/spares-and-settings/keihin-spare-parts/spare-parts.html

Bryanj:
Canada one is sirius consolodated but they dont do genuine, they are the only place i have found the push in pilot jets for the pd carbs.
Shame is their website is totaly crap

Murf:
I nearly placed an order with NRP as they have some 103 jets (just listed as made in Japan) but they have such terrible feed back of late that I didn’t bother.   I will give Allen’s a call and see what they have.  David Silver did have  100 keyester jets, if I go aftermarket then I will buy all four so they match.
  I can then put my 2 100 and 2 115 jets that came with the bike in my hall of horrors, this bike has added more exhibits than the 500 Triumph did, which I had hoped was impossible. 😢😂

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