Aftermarket exhaust? High flow air filters? Looking for more power? You're gonna need to up-jet. Or maybe you're just cleaning the carbs and need some new stock size jets? We have a range of sizes available from #35 - #45. Keihin slow / pilot / idle jet. Made in Taiwan. Pick your size from the dropdown menu above. These jets are "Friction Fit / Push In / Press Fit" style, they are not threaded, they fit the SOHC CB550K and CB750F/K from 1977-1978.

These jets can be difficult to remove, gently grab them with pliers, sometimes it's good to wrap them in rubber or something soft before using pliers. Twist gently back and fourth until you get them out, don't rock from side to side.

Make sure to look up the stock size in your owners manual and start there. Make sure to check what carburetor model you have since some bikes don't have stock carburetors on them.

CB550K 1977 carb model X46A used a #38 slow jet
CB550K 1978 carb model PD46C used a #42 slow jet
CB750F/K 1977-1978 carb model PD41B, PD42A, 41A, PD42B used a #35 slow jet

Jet Dimensions:

Jet Height: 28.2mm
Outer diameter: 5mm

Fits Honda:

XL100 - 1977-1978
CB125S - 1978-1979
XL125 - 1976-1978
CM185T – 1978-1979
XL350 - 1977-1978
CB550K - 1977-1978
CB650 – 1979-1980
CB650C Custom – 1980
CB750A – 1976-1978
CB750F - 1977-1978
CB750K - 1977-1978

And others. . .

Also fits some XL80 and XL185 models...

16 Reviews Hide Reviews Show Reviews

5
slow jet

Posted by Ralph Walter Vazquez on 20th Apr 2024

Worked well, fit tight in carb fixed my problem.
5
REPLICA KEIHIN SLOW JET

Posted by Alejandro on 14th Jul 2023

Worked like a charm on my pod filter carbs
5
Low speed mixture jets

Posted by Charlie on 12th Jun 2023

In a phrase, plug and play could be said, say instead plug and purr.
5
Excellent!

Posted by Alex Arocha on 22nd Sep 2022

Full rebuild of 78 CB750k using over 90% parts from 4 into 1. Excellent product, amazing, service, and value. I will be duplicating this review in some of the parts I purchased. This is 100% from a true customer! Love 4 into 1!
4
Quality

Posted by Ron on 26th Jul 2022

For the cost they are of good quality. The press fit isn't as tight as the original Keihin jets but stay put. Make sure you check the orifice for obstructions and burrs. Found some machining debris.
5
Slow jets work great.

Posted by Edward Groves on 6th Jun 2022

They fit well in my 1978 CB 750K
5
Honda CB750 slow jet

Posted by Parks on 24th Aug 2021

Very nice quality slow jet. Great value for the product. Honda shop wanted 4 times the cost.
5
Replica slow jets

Posted by James on 10th May 2021

Perfect fit and the bike idles just fine.
5
Slow jet

Posted by Marek Surma on 9th Nov 2020

Perfektne replika