PD46 Idle Jet

[PennoK3]

Simple question, should the hole in the idle jet be clear its full length?  Trying to work out if its blocked or correct.

[McCabe-Thiele (Ted)]

The jets in my 400 & 500 were clear right through.
There is an optical illusion imho that makes some folk think there is a fine mesh inside.

I used a long wire taken out of a wire brush to make sure it's unobstructed - I then pop it in the Ultrasound bath again for an extra clean.

[Johnny4428]

Definitely should see light all the way through, also important for the side holes to be clear. High E guitar string works too to clear these jets, very small passage through at the thin end.

[PennoK3]

Thanks guys.   Yes, blocked solid.   Had a quick look on the internet for new ones (Size 42) but they all seem to be in Germany.   Any UK sources that anyone could recommend?

[Bryanj]

They are press in jets not available from Honda, only place i ever found them was Sirius Consolodated in Canada but their website is a nightmare

[Laverdaroo]

Currently in the US if anyone needs any bringing back. Back late December.


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[K2-K6]

The jets in my 400 & 500 were clear right through.
There is an optical illusion imho that makes some folk think there is a fine mesh inside.

I used a long wire taken out of a wire brush to make sure it's unobstructed - I then pop it in the Ultrasound bath again for an extra clean.

I remember discussing that Ted, and thought I could see something of that order.

I researched that further (but forgot to post anything about it) with this link  https://www.telescope-optics.net/diffraction_pattern_and_aberrations.htm I think, explaining more about it.

If you go approximately halfway down that page, there's illustration of "primary astigmatism " with attendant longitudinal cross section, accompanied by end on optical effect, this i believe accounts for that effect in the viewer's visual interpretation.
It seems to produce a cross from light diffraction through that tube type view you instigate by looking through the idle jets in the scale they are.

That's quite deep into optical theory, phew 

[Sesman]

Heat them over a flame that give them a light tap. Most of the resin comes out as ash. Then clear with the E string. Or give Superbike Surgery a nudge. He has a super duper carb cleaning formula…he say.

[deltarider]

The design of the PD46 carbs differs fundamentally from the oldstyle carbs on previous CB500/550 models. The idle jets of the PD carbs see less fuel passing than the slow jets in the oldstyle carbs. Gasoline (petrol) has changed also. Best advice I can give: either use your bike regularly or add a maintenance dose of a socalled fuel system cleaner additive at every tankfill and hope the best of it.

[Johnny4428]

I replaced my pilot jets with 45’s. Just give a little extra fuel to improve starting and running. I have had a reasonable success so far and to compensate have been tweaking the mixture screws ((closing about an eighth of a turn at a time). Unfortunately the bike is now in hibernation until next spring. But the last run I had there was still some adjusting to do on two of the cylinders. I do work an addative too (Frost Ethomix) longer periods between runs.

[Bryanj]

Attached is a screen shot from Sirius  web page, their site seems to have improved.
I have bought from them and found service quick and not phenominaly expensive

[Laverdaroo]

Still heer if you want em bringing back?…….,


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