Keihin Main Jets

[martin_uk]

Genuine jets are expensive but Motorcycle Products do sets of 5 for £7.68


https://www.motorcycleproducts.co.uk/keihin-105-brass-jets/1/016688



Keihin 105 Brass Jets

    Head size 6mm
    Thread 5mm
    Pitch 0.80mm
    Overall length 9mm
    Thread length 5mm
    Made in Japan

Many other sizes and for other carb manufacturers

Ideal if you need to try different sizes

[Nurse Julie]

Handy link, thanks.Do any of the Keihin carbs fitted to CB SOHC/4's use screw in jets 🤔

[martin_uk]

Handy link, thanks.Do any of the Keihin carbs fitted to CB SOHC/4's use screw in jets 🤔

Yes the main jets on CB750F1 and CB750K8 PD carb do for certain.

The PD carb slow/idle are push in.

[Nurse Julie]

Handy link, thanks.Do any of the Keihin carbs fitted to CB SOHC/4's use screw in jets 🤔

Yes the main jets on CB750F1 and CB750K8 PD carb do for certain.

The PD carb slow/idle are push in.

Ah, OK, far to new models for my knowledge base 😁

[Bryanj]

Now nowJulie, all the 750 use screw in mains, ad pilots for that matter.

[Nurse Julie]

Now nowJulie, all the 750 use screw in mains, ad pilots for that matter.

You're correct I'm sure Bryan 🙃🙃🙃 I don't do too much with 750 carbs, Graham knows I'm shite with them and only let's me loose on the 400/500/550 ones 😁😁😁

[Bryanj]

I try not to do any of them and i wont even touch the damn PD ones any more, i think i got 2 or 3 sets of 750 ones (PD that is) if Graham wants them

[Nurse Julie]

I try not to do any of them and i wont even touch the damn PD ones any more, i think i got 2 or 3 sets of 750 ones (PD that is) if Graham wants them

PD's have no place here, except in the skip. I think Graham would favour a hole in the head above 3 sets of PD's, thanks for the offer though and I don't stock any parts or rebuild kits for PD's either 😘😘😘

[martin_uk]

One of the key things on the PD is to remove/replace/clean  the pilot/slow jets and passages which tend to get blocked.

Also, make sure all accelerator jets squirting well and dont try to increase mixture too much with mains and needle.

Mine had 125 mains and 1.2mm  of washers under needle and pulled very poorly and hesitated.

Changed to 110 mains and 1 x 0.4mm washer under needle and runs great