Carburetor Model Number

[Hoko]

I'm trying to find slow/pilot jets for my Keihin carburetors on my 78 Super Sport.  Havent been able to find them on Jetsrus by bike model and year so I'm going to try by the carb model #.  Where should I look for the model # on my carbs?

[Hoko]

Ok, I did some searching online and a chart said the 78 cb750f super sport has keihin pd42a carbs with 105 main jets and 35 slow jets (I assume the numbers are the mm diameter of the jet holes).  I havent been able to find someone who sells these.  Can someone send me a link to a supplier? Thx

[shinyribs]

Hoko,do you want new jets,or do you just want those sizes? From what I can tell ( jets here, but only in multi-size packs ) your carbs use the same jets as the roundtops I use. If used jets are ok with you I may have those sizes. 50% sure I have the 105's. 75% sure I have the 35's

[shultz_1978]

Hoko If I remember right those are stock jets for your bike. Right?

[Lucky 1]

Why are you buying new jets?

They do not really wear out.
BTW if you do not have the stock air box and stock exhaust those stock jets will not work.
The #35 idle jet is very small =(LEAN).

[Hoko]

shinyribs wrote

Hoko,do you want new jets,or do you just want those sizes? From what I can tell ( jets here, but only in multi-size packs ) your carbs use the same jets as the roundtops I use. If used jets are ok with you I may have those sizes. 50% sure I have the 105's. 75% sure I have the 35's

All I need are the slow jets (.35mm).  If .45mm are available, I,d rather have those because I plan on drilling them out to .45mm

Shultz wrote
 In reply to this post by Hoko
Hoko If I remember right those are stock jets for your bike. Right?
Jamie

Yes, those are the stock jet sizes.

Lucky1 wrote
Why are you buying new jets?

They do not really wear out.
BTW if you do not have the stock air box and stock exhaust those stock jets will not work.
The #35 idle jet is very small =(LEAN).

When I removed the slow jets to clean them, I slightly bent each one of them.  Now I want to drill them out to .45mm so I want straight jets for that.  I do want to remove some of the baffles from the muffler eventually so I would like your input on that as to how I would need to rejet for that.
Thanks for all the help guys.

[shultz_1978]

If you are running stock air box and filter set up I would try the stock jets first.

If you are running  open air filters like pods Good luck.

They will never run as good as factory.

With some work and playing around you can get them to run pretty good.

That is just my input.

I did some carb work on my bike and it is not that hard. Good luck

[Hoko]

Just for my own information, would a #35 jet have a 35mm opening and a #105 jet have a 105mm opening etc?

[shultz_1978]

You got me on that one.  If you think about it like a bolt size.  Look at the size of a 12mm bolt it is close to a 1/2". I don't know what scale they used on jets.

They could not have used the wire size #'s, in the wire size the higher the number the smaller the wire. The smaller the number the larger the number. For example I used a #77 bit to drill out #35 jets.

I am pretty sure it is just #35  .035 and #45  .045 I think,

[shinyribs]

I don't know if those numbers relate to anything at all.I really dont think they do.


Hoko,I forgot that your carbs have the pressed in jets vs the screw in type. Sorry bud,I cant help ya there.

[Lucky 1]

NO ...It is .35mm not 35mm.

.35mm= .013 thousands of and inch.

Get it?

Go toGoogle. Type in "inches=mm" Then use the conversion chart.

BTW drilling the jet to .45mm will not work. (Too rich), that is old info on the Honda Chopper website.
The correct size to run with pods and aftermarket exhausts is 42mm.

I just gave you valuable information that will save you a lot of hell.

[Hoko]

Thanks Lucky, I appreciate that.  So it should work with pulling some baffles out of my stock muffler, right?