Keihin Carburetor

[Ultraliner]

Im running one of these original AF18 Dio carburetors on my recent 50mm BBK using a stock exhaust and airbox.

These come standard with a #75 Main jet. I had a spare carb with a #88 in it that the previous owner had been running with a failed BBK installation(I am not aware of the bore size)so have been very gingerly running with the #88 main and the needle in the highest position(clip in lowest notch).

Been monitoring CHT with my home made CHT washer attached to a multimeter with temperature function and have so far only seen about 280 farenheit which is good, but haven't been too hard on it yet.

Have had some new #92, 95, 98 and 102 mains arrive to play with but am having trouble locating replacement pilots. Stock pilot size is #35.

Has anyone else been successful in locating replacement oversize pilot jets for these carburetors? Or have any other suggestions regarding carburetor settings I should be looking at for this setup?

It would be cool to get a few different sized pilots to do a bit of investigation with.

[1man8scoots]

Looks like a keihin pwk slow jet

[Peteyparado]

Same as pwk.. OKO,polini,Koso....

[benji]

Yup, looks like my jets in my koso pwk carb. Pretty standard. Except you need some bigger ones haha. They should be cheap and all over ebay.

[benji]

Actually I just saw your head temp and maybe your good.. people usually don't get worried til it hits like 320-350.

[mousewheels]

Has anyone else been successful in locating replacement oversize pilot jets for these carburetors? ...It would be cool to get a few different sized pilots to do a bit of investigation with.

Honda used to have pilot (slow) jets from #35 to #48 available for Keihin PB carbs -- link http://hondaspree.net/wiki/index.php5?t ... _Reference
Edit: Add -- Honda Part numbers are contained at the bottom of the link

Also PB was used in Aero 80 in addition to Dio. Stock for Aero 80 was #35 pilot.

[patthesoundguy]

280f is a pretty normal temp when not running hard on stock machines

[bonesv]

This is the PB carburetor pilot jet number found from jets-r-us http://jetsrus.com/a_jets_by_carburetor ... 27-xxx.htm

This is the PWK/OKO style pilot jet found from jets-r-us http://jetsrus.com/a_jets_by_carburetor ... 26-xxx.htm

These are two different pilot jets and do not fit one another. Here is my source of information. I buy jets from these guys, usually at my door within 2-3 days. http://jetsrus.com/a_jets_by_carburetor ... ection.htm

[ped]

Has anyone else been successful in locating replacement oversize pilot jets for these carburetors? ...It would be cool to get a few different sized pilots to do a bit of investigation with.

Honda used to have pilot (slow) jets from #35 to #48 available for Keihin PB carbs -- link http://hondaspree.net/wiki/index.php5?t ... _Reference
Edit: Add -- Honda Part numbers are contained at the bottom of the link

Also PB was used in Aero 80 in addition to Dio. Stock for Aero 80 was #35 pilot.

Hey Mr Mouse Wheels. The man, the myth the legend . how the hello are you doing?
The forum has not been the same since you've been gone.
I miss the accurate information and photos that you provided. All the sketches and graphs.The Forum is not the same.
Well I'm glad you stopped by.

[Wheelman-111]

Greetings:

Mr. Mouse is truly Missed. Stop by more oftwn.

[Ultraliner]

Thanks for all the input and the links to the site to source them from. They are indeed different to the PWK/Polini slow jets - Not by much, but if you look at a pic of a PWK/Polini slow jet you'll notice the difference between the threads of the two.

I called Honda today with the part numbers for the OEM oversize pilots(thank you mousewheels). It would seem Honda New Zealand have no idea or match so have sent a query off to Australia... Will wait and see.

Knowing the correct names for particular items is also pretty handy. Great to learn that this is a Keihin PB series

I agree that up around 280f is of no cause for concern yet, but i'm sure the stock pilot isnt going to be the best for a larger displacement cylinder, especially when starting to push it a bit harder