Topic: 1976 Honda CB360T jet sizes

[vonoretn]

Anybody know what the correct jets are for a CB360T?  This bike I bought used runs great until it fouls the plugs in about 10 miles.  Compression=165psi right, 170 psi left, with 4 squirts of oil, each one reads 225psi.  I don't know where the air jets are located, I assume the ones shown below are the fuel jets.   Any knowledge on the subject is welcome.  

[BlindJoe]

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Primary and secondary main jets should both be #68's, the slow jet under the solid screw should be a #35.

[vonoretn]

Thanks Blind Joe, that's the most authoritative jet information I have seen so far.  This could explain why I am running so rich.  My "89" might actually be a 68, depending on which is the top of the text.  I'm good on the #35 slow jet.  

Which is the primary and the secondary main jet?    

Do you know where I can buy these main jets?  

I haven't run into the air jets yet, where are they on the carb?

My local Honda dealer in Athens, Tn. didn't have jets this old, with this thread, nor did he have anything in a different thread under size 80.   His data, which I don't think was as good as yours, said the main jets should be 95 and 110.   Since I'm running rich now, I'm going with your data.  But the Keyster kits for this bike come with #100 main primary jets, which is what I already have...

http://stores.rustyriders.net/-strse-345/Honda-CB360-Keyster-Carb/Detail.bok

Thanks again for this info.  I am trying to get the metering rod screw out of the top bellows tube, but both of them are 33 years frozen, such that if I turn them the whole bellows tube wants to turn, and I don't have a tool to react the torque, grabbing the inside of the tube, while a screwdriver is going through the middle of it.  Since new bellows cost $99 apiece I want to be very careful here.  

Maybe I should just get four number 68 main primary and secondary jets, and try that for now, forgetting the metering rods.  I got new NGK plugs at the Honda dealer.  They said the Champion ones that I had are old and low tech.  

[BlindJoe]

Hmm, just found this http://forums.sohc4.net/index.php?topic=48608.0, so I think what you have may be correct.....

[vonoretn]

So I have to ask the question, is there anybody with a CB360 who has 68 secondary main jets and 68 primary main jets, per the Honda document above in this topic, and it is working?   Or is it just an unreasonable error to consider 68 secondary main jets because they are too small.  By the way is a 68 jet a jet with a .68 millimeter diameter hole?   

[James360]

Thanks Blind Joe, that's the most authoritative jet information I have seen so far.  This could explain why I am running so rich.  My "89" might actually be a 68, depending on which is the top of the text.  I'm good on the #35 slow jet.  

Which is the primary and the secondary main jet?    

Do you know where I can buy these main jets?  

I haven't run into the air jets yet, where are they on the carb?

My local Honda dealer in Athens, Tn. didn't have jets this old, with this thread, nor did he have anything in a different thread under size 80.   His data, which I don't think was as good as yours, said the main jets should be 95 and 110.   Since I'm running rich now, I'm going with your data.  But the Keyster kits for this bike come with #100 main primary jets, which is what I already have...

http://stores.rustyriders.net/-strse-345/Honda-CB360-Keyster-Carb/Detail.bok

Thanks again for this info.  I am trying to get the metering rod screw out of the top bellows tube, but both of them are 33 years frozen, such that if I turn them the whole bellows tube wants to turn, and I don't have a tool to react the torque, grabbing the inside of the tube, while a screwdriver is going through the middle of it.  Since new bellows cost $99 apiece I want to be very careful here.  

Maybe I should just get four number 68 main primary and secondary jets, and try that for now, forgetting the metering rods.  I got new NGK plugs at the Honda dealer.  They said the Champion ones that I had are old and low tech.  

In the cheap clymer manuals you buy 250 & 360 honda for $20.00 ( first junk i bought ) it lists for a 250cc honda, pilot ( slow jet) 35, primary 68, main 95. but for a 360 it lists, pilot 35, primary 68, main 68. This is a misprint the correct factory jets are 35, 68, 100 for the main. I removed my 100 jets went to 110s because i removed the mufflers. If you put a 68 in your main put your engine under any kind of load you will have instant lean burnt pistons. You can look up your OEM main jet. at www.crotchrocket.com Your local honda dealer can get you the 35 slow jets or the 100 main jets, honda no longer has the 68 primary jets.

[vonoretn]

Hum, must be something else making my bike run rich.  If I increase the float level from spec of .75 to say .80, will that lean it out a bit?   Should I experiment with say a 90 jet instead of the 100's?  Note updated pictures at the top. 

[kirkn]

Well, I have a copy of the Honda CB/CJ250 CB/CL/CJ360 shop manual and it, too, specifies pilot 35, primary main 68 and secondary main 68.  But, I'm thinking that's a misprint right from Mother Honda. 

Comparing the jetting to the specs in the Honda CB350 Factory Service Manual, the 350 was jetted with 78 primary and 105 secondary mains.

You asked about which is which, primary and secondary, but you must've corrected your photo, but it is labeled correctly.

Float level definitely can effect lean/rich running, but I would set the float level correct, and go with leaner secondary main jets, if I were you.

Maybe not as lean as 68, but definitely leaner than 100s, because clearly, you're running rich.

In my opinion, those 100 secondary mains you've got are NOT the OEM Keihin jets.  They don't have the stylized 'K' that the others do.

How about your air filters?  Clogged air filters will give a rich running condition as well.  And it doesn't take much to clog the paper elements.  In fact, getting them moisture-contaminated can do it, too.

Kirk

[kirkn]

Hmmm.....  My Honda shop manual (with it's admittedly likely incorrect jetting # error) clearly shows it to be like his picture shows - two separate screw-in jets.  Primary main forward of secondary main; secondary main directly beneath jet needle.

[vonoretn]

Thanks for confirmation.  No I've run it a couple of times with no filters, and the plugs are still badly fouled.  I'm gonna be gone this weekend, but I'll order two 90 main secondary jets now, and install them when I get back. I'll leave the float level at spec of .75".   I found reasonably priced main secondary jets at:

http://www.jetsrus.com/a_jet_kit_street/honda_360_CB360G_1974.htm

I am still really curious if there is ANYONE out there with a CB360 who is running the erroneous 68 main secondary jets as specified in the manual, and it is working fine for them.

[joesmotos]

I have a Honda Factory Spec book that goes up to 1980,it says that the slow speed jet(pilot) is a #35..then a #68 and a 100 or 110 main jet depending on which carb model is on the bike.

Did you happen to pull out the needle jet and make sure that the holes in it are all clear?If the bike sat a long time the little emulsifier holes could be plugged up which wont allow the fuel to atomize and will make it run really rich.

Also,under the #68 jet,isnt there a pressed in tube(jet) there?In the past i have taken a small ez out and stuck it in there and then warmed up the carb with a heat gun,sprayed some penetrating oil in the hole and GENTLY worked it back and forth to get it out so i could clean it(poke a small wire through it to make sure its clear)..

Just a couple of ideas for ya..i have a set of carbs here for a 360 if you need me to look at anything in particular for you.

I would scope out that needle jet though..
Joe

oh and p.s..hopefully no one drilled out the stock pilot jets(as in tried to clean them with a drill bit or something) and made the hole to big..that would make it run to rich also.