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Would this work??
- Becker
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- The Doctor Will Rise Again
78 KZ750B3
79 KZ400 LTD
78 KZ650C2
79 KZ650C3
78 KZ650B2A
80 KZ650F1
80 KZ650E1
81 CB750K Super Sport
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- steell
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Rebuild kits are available for the 76-79 carbs.
Did you set the fuel level in the float bowl?
If the level is to high it will run rich.
KD9JUR
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- Becker
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78 KZ750B3
79 KZ400 LTD
78 KZ650C2
79 KZ650C3
78 KZ650B2A
80 KZ650F1
80 KZ650E1
81 CB750K Super Sport
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- wiredgeorge
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You use the term "running rich". I can only assume your plugs are sooty. If you have stock jetting, did it ever occur to you that the soot may not be air/fuel mixture related as relating to jetting? Could you have a dirty air filter? That will soot up your plugs. Could you have little or no valve clearances? That will soot up your plugs. Could you have a weak spark? We have an article on COIL REPOWERING on our website under wg's Tech Stuff index that explains how poor voltage at your coils will cause incomplete combustion (SOOTY PLUGS).
Do some research before mucking around with jetting on a bike with a stock airbox. Most likely the soot isn't the result of jetting.
wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!
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- bountyhunter
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That does sound rich.the other thing I forgot to mention was that I can start the bike up and immediatley drive off when it is dead cold with no choke.
What pilot jet are you running? Stock on my '79 750 Twin was 40. They are available in sizes up to 60. This place has the full size range and will sell them in sets of two unlike so many other places that make you buy four at a time.
www.psep.biz/
Also, did you check the needle position? The stock setting for the BS-38 is the center slot, you can rich the heck out of it my moving to lower slots.
You did not say what main jet was in it. The stock one is 125 if my memory serves me. You can get rebuild kits with the stock jet. BTW, don't assume that the number on the jet is right, sombody drilled mine.
This place sells BS-38 rebuild kits for $19 and they come with the correct stock main jet:
www.loudfastugly.com/carbkits/carbkits.htm
1979 KZ-750 Twin
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- KZErider
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81 KZ750E2(project), 81 KZ750E2(parts donor), 87 BMW K 75C - got it runnin, didn't care for it, holding for family member, 79 CB650(project) Nomad 1700, VStar 950
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- Becker
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BS30/96 and I am sure Z1Enterprises carries whatever size in this type pilot jet you are interested in.
You use the term "running rich". I can only assume your plugs are sooty. If you have stock jetting, did it ever occur to you that the soot may not be air/fuel mixture related as relating to jetting? Could you have a dirty air filter? That will soot up your plugs. Could you have little or no valve clearances? That will soot up your plugs. Could you have a weak spark? We have an article on COIL REPOWERING on our website under wg's Tech Stuff index that explains how poor voltage at your coils will cause incomplete combustion (SOOTY PLUGS).
Thanks for the information on the pilot jets, I'll be checking with z1 after I figure out what kind I have in it now.
It actually has a clean air filter, fresh plugs, a new coil, coil repowering mod, and I made the HEI system using the GM 400 module that I'm pretty sure I found on your website (thanks for that one by the way it works really well). I have never checked the valve clearances though but with 10,000 miles on the bike I doubt if they are to tight. The plugs are black and sooty which isn't really that much of a problem since the bike still runs fine but the last time I took it on a road trip It averaged 30 mpg and I wasn't riding hard just 65-70 mph over nice rolling hills. I knew it was rich then but I added all the electrical stuff this winter plus a macs 2-1 pipe. Since then I have just been using on sort stints a couple miles at a time. So maybe I will just have to wait and take it on a long road trip before I go messing with the pilot jets.
78 KZ750B3
79 KZ400 LTD
78 KZ650C2
79 KZ650C3
78 KZ650B2A
80 KZ650F1
80 KZ650E1
81 CB750K Super Sport
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- wiredgeorge
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wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!
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