Topic: FYI if ordering slow jets for roundtop carbs

[evanphi]

I got a nice forum member to send me jets from jetsrus.com. I live in Canada so they won't ship to me.

I got them yesterday and I noticed no K stamp on them. My heart sunk as I thought the order was placed wrong, but there is only one option for ordering for the roundtop carbs on their site.

They are aftermarket only!



The only place you'll be able to get genuine Keihin slow jets, OTHER than stock, would be through honda dealerships (if they are available).

FWIW, size 42s were stock on the CB400F model bikes.

[harisuluv]

Any Honda dealer can look up the nationwide database to see if they have any NOS 42 jets--they may or may not be available.

The 400F uses a #40 slow jet, and the 350F uses a #35 slow jet.

[evanphi]

http://www.partzilla.com/parts/detail/honda/HP-99124-076-0420.html

[flybox1]

http://www.partzilla.com/parts/detail/honda/HP-99124-076-0420.html

Yes, they are obsolete, but there still may be some around.
you sure you need 42s?

[evanphi]

http://www.partzilla.com/parts/detail/honda/HP-99124-076-0420.html

Yes, they are obsolete, but there still may be some around.
you sure you need 42s?

Yes I am only 1/4 turn out on my idle screws and very lean at idle.

[flybox1]

http://www.partzilla.com/parts/detail/honda/HP-99124-076-0420.html

Yes, they are obsolete, but there still may be some around.
you sure you need 42s?

Yes I am only 1/4 turn out on my idle screws and very lean at idle.

Tell us about your setup. . .

[flybox1]

What could be really confusing is there are press-in and screw-in type pilot jets listed on the jetsrus 400F page.
The 400f's take the screw-in type.
Just throwing this out there....could it be that your US buyer purchased the (wrong) press-in type by mistake, when you really should have the screw-in type? 

[flybox1]

More confused...400F's dont have roudtop carbs.
So what bike did those carbs originally come on?   

[evanphi]

What could be really confusing is there are press-in and screw-in type pilot jets listed on the jetsrus 400F page.
The 400f's take the screw-in type.
Just throwing this out there....could it be that your US buyer purchased the (wrong) press-in type by mistake, when you really should have the screw-in type? 

Nope. They're correct for my bike.

More confused...400F's dont have roudtop carbs.
So what bike did those carbs originally come on?   

These are correct. It is how Honda designated the jet part numbers.

http://www.siriusconinc.com/pro-detail.php?pid=&product_id=1947

https://jetsrus.com/a_jets_by_carburetor_type/jets_keihin_99124-076_slow.html

 

http://www.partzilla.com/parts/detail/honda/HP-99124-076-0420.html

Yes, they are obsolete, but there still may be some around.
you sure you need 42s?

Yes I am only 1/4 turn out on my idle screws and very lean at idle.

Tell us about your setup. . .

In my signature. Checked new plugs after five minutes of idling under fans. They look brand new.

[flybox1]

What carb model do you have?
...so confused with the 400F jet mention in your first post 

[harisuluv]

I'm sorry but the #42 just isn't stock on a 400F.  I think what's happening is that you're seeing that the #42 is listed under the CB400F parts list/fiche, but it's normal that they will list 1-3 jet sizes to accomodate for users making modifications.  If you look again at the link you will see that the #40 is also listed in the list.  Also listed is 38, and 42.  Same goes for the main jets listed for the 400F:  #72, #75, and #78.

The stock size for the 400F is #40 slow, #75 main.

http://www.partzilla.com/parts/search/Honda/Motorcycle/1976/CB400F%20A/CARBURETOR/parts.html

[harisuluv]

Flybox, he's saying he has roundtop carbs on a cb750.  He looked up the jets for the cb750 and didn't see 42 listed in the parts list.  So looking around for other models saw that #42 is an option in the 400F parts list.

The #42 jet association with the CB400F is just arbitrary, so he can use that in his cb750 carbs.

I don't like how jetsrus will liberally use the term "OEM".  When people are looking for jets and start talking about jetsrus and this is brought up to them, they are resistant and insist they are all OEM jets because they are kind of misleading on their site.

[flybox1]

Now i'm following 

[evanphi]

Glad we're all on the same page now. Haha.

Jetsrus makes a good distinction with their main jets, but doesn't explicitly state the slow jets are non-oem.