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Re: excessive smoke right cylinder

Posted: Tue Nov 10, 2020 7:46 am
by kawonda750
Thanks Karl. I am new to these CV carbs but if the air screw is out 3/4 rather than 1/4 doesn't that give me a leaner mixture ? I am going to try B6ES today and see what that does. I am trying one thing at a time hoping to isolate what is going wrong. So far, it has been quite a test for my trouble shooting skills... or lack thereof....

Re: excessive smoke right cylinder

Posted: Tue Nov 10, 2020 11:21 am
by karl pa
On these carbs, I think they are actually fuel screws not air screws,the way I understand if the screw is between filter and carb they are air screws,if the screw is between carb and engine they are fuel screws, the 75 uses 45 pilots with screws out 3/4, they also have different cutouts in slides.

Re: excessive smoke right cylinder

Posted: Tue Nov 10, 2020 2:53 pm
by kawonda750
Ok, that changes everything. I will try 1/4 turn next.
Thanks again.

Re: excessive smoke right cylinder

Posted: Tue Nov 10, 2020 3:25 pm
by karl pa
I don't know that the mixture screws will change much with your issue. pilot circuit is mostly low throttle input, what is the condition and setting of needle and jet.And I assume you already checked air filter.

Re: excessive smoke right cylinder

Posted: Wed Nov 11, 2020 2:49 pm
by kawonda750
At present the airbox is not on because I have been playing with the carbs. Honestly, I have not even checked the needle clip position. I tried the 1/4 turn on the mixture screws and it made a big difference. I am kicking myself because I should know better than to not have checked the needle clip.

I guess that is my next step.

Re: excessive smoke right cylinder

Posted: Wed Nov 18, 2020 1:49 pm
by kawonda750
It seems that I have the wrong pilot jets. I was given the 4 hole ones that are used in the Kawasaki VM carbs where the Suzukis use 3 hole ones. I will see if these make a difference when they arrive from the Suzuki dealer.

Re: excessive smoke right cylinder

Posted: Sat Nov 21, 2020 12:54 pm
by kawonda750
I changed to the right pilots and it seems to have worked. Of course, I forgot to put the joining bar back on so I have to remove the carbs again but , at least, I can leave the cables connected.
Thanks for the input. :mrgreen:

Re: excessive smoke right cylinder

Posted: Fri Jan 15, 2021 5:51 am
by rngdng
I ran into the pilot jet problem many years ago. It sucks that Mikuni has two types of pilots number the same that are SO different.


Lane

Re: excessive smoke right cylinder

Posted: Fri Jan 15, 2021 9:11 am
by jabcb
Mikuni has 3 pilot jets that look similar that are 14mm long with 4.9mm thread.
BS30/96 has 6 shaft holes
N151.067 has no shaft holes
VM22/210 has 8 shaft holes
https://jetsrus.com/FAQs/FAQ_identify_that_jet.htm

VM carbs on the GT series & most of the T series use VM22/210.
See page 10 in: http://www.ozebook.com/compendium/suzi/suzidata1.htm

The VM carbs on the 72/73 GT750 use the 8-hole VM22/210. Same as those Kawasaki VM carbs.
But the CV carbs on the later GT750 use the 6-hole BS30/96.

VM & CV carbs are very different beasts.