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Engine dies as throttle applied...ideas?
- Spenzher
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'83 KZ750N Shaft
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- Motor Head
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Uh, sealed the "MAIN JET HOLE"???Spenzher wrote: I also changed the carburetors and put in ones from a 1980 and sealed the main jet hole so there was only a needle jet and pilot jet, like the spectre had in the first place. I didn't think to check the float levels though...just assumed they were good when I got them....
That can't work. You need to rethink that completely. Make the carb have All of the original circuits, and only increase the jet sizes for your POD filters. Hopefully they fit correctly and don't cover the Air Jets.
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...
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- CrazyDuck
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Spenzher wrote: sealed the main jet hole
Well, unseal it. :laugh: I guess I was right about it not getting any fuel.
1976 KZ900
1974 TX500
1978 TT500
2007 Aprilia SXV
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- baldy110
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- Spenzher
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Motor Head wrote:
Spenzher wrote: I also changed the carburetors and put in ones from a 1980 and sealed the main jet hole so there was only a needle jet and pilot jet, like the spectre had in the first place. I didn't think to check the float levels though...just assumed they were good when I got them....
Uh, sealed the "MAIN JET HOLE"???
That can't work. You need to rethink that completely. Make the carb have All of the original circuits, and only increase the jet sizes for your POD filters. Hopefully they fit correctly and don't cover the Air Jets.
CrazyDuck wrote:
Spenzher wrote: sealed the main jet hole
Well, unseal it. :laugh: I guess I was right about it not getting any fuel.
Hold on gentlemen. There are a total of three jets. One main jet, one needle jet, one pilot jet. Ironically they call the needle jet a secondary jet. The main one is for transitioning between pilot and needle. Now, on the carburetors that were originally on my bike, they didn't have main jets. They had a needle jet and a pilot jet. I am merely creating that same scenario even though there are main jets in the carburetor I am using now. If I were to use the same main jets, the actual bike would be getting way more fuel that it had beforehand.
'83 KZ750N Shaft
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- Spenzher
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baldy110 wrote: It has been my experience that if the bike ran fine before working on it then suddenly start running like crap after working on it then it was something I did. If you did not change any of the valve shims then I would look at the other things you might have touched, vacuum lines to carbs and petcock, ect Re-check your work.
Yeah...I definitely messed something up. Hm.
'83 KZ750N Shaft
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- CrazyDuck
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1976 KZ900
1974 TX500
1978 TT500
2007 Aprilia SXV
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- Spenzher
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CrazyDuck wrote: You don't plug anything off just because the other carburetors did not have it. They are designed differently and cannot be expected to run if you start plugging things off or massively alter things.
I'm not so sure about that but maybe someone else can chime in. I'm using a carburetor pulled off of a 1980 kz750 and my bike is a 1983 kz750.
'83 KZ750N Shaft
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- baldy110
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- Spenzher
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baldy110 wrote: What carbs are you talking about here, the Mikuni BS34 or the Keihen CV's? All the Keihen's and Mikiuni's have main jets. The main jet is attached to the bottom of the needle jet and regulates the amount of fuel going into the Needle jet. If you plug the main jet then no fuel is going to get to the needle jet so the engine will not run past idle.
Oh boy, I hope I got this right ...but I plugged the unthreaded one in the picture. The one in the picture is the original carb, which I unfortunately can't use. To my knowledge it only uses a needle jet and pilot jet. No main. So I thought I could use these other 1980 cv34 carbs and just plug the main jet, thus making the fuel intake less, and create the same settings as the original carb.
'83 KZ750N Shaft
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- Motor Head
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1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...
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- Patton
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This link is to an article in KZr's FILEBASE that may prove helpful.
Click here > www.kzrider.com/filebase/doc_download/47...-shop-manual-via-omr
Good Fortune!
1973 Z1
KZ900 LTD
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