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120 Main Jets? BS34 carbs
- daveo
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21 Sep 2011 15:14 - 21 Sep 2011 22:46 #478355
by daveo
1982 KZ1100-A2
120 Main Jets? BS34 carbs was created by daveo
Just put in new K&L carb kits. BS34/Stock KZ1100A-2 w/airbox and 83'LTD exhaust.
I have a question about main jets. The shop book calls for 120 main jets, and 37.5 pilot jets...so those are the ones from the kits I put in.
The spark plugs have carbon fouling, although not bad.
I assume the engine is running rich/correction (too much fuel)? Would changing the main jets one size smaller help? What size...117.5?
Suggestions anyone?
I have a question about main jets. The shop book calls for 120 main jets, and 37.5 pilot jets...so those are the ones from the kits I put in.
The spark plugs have carbon fouling, although not bad.
I assume the engine is running rich/correction (too much fuel)? Would changing the main jets one size smaller help? What size...117.5?
Suggestions anyone?
1982 KZ1100-A2
Last edit: 21 Sep 2011 22:46 by daveo. Reason: error
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- T_Dub
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21 Sep 2011 15:24 #478359
by T_Dub
1977 KZ650B1
-810cc
-Cavanaugh Racing Head
-Mikuni RS34's
-GPR Muffler
Replied by T_Dub on topic 120 Main Jets? BS34 carbs
Lean is not enough fuel. Usually with carbon fouling you are running rich. The main jet really only affects wide open throttle, seems weird that you'd be fouling after a kit. Have you got your air screws adjusted properly?
1977 KZ650B1
-810cc
-Cavanaugh Racing Head
-Mikuni RS34's
-GPR Muffler
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- daveo
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21 Sep 2011 22:43 #478462
by daveo
1982 KZ1100-A2
Replied by daveo on topic 120 Main Jets? BS34 carbs
Had the air screws all at two turns out, now two and a half and three.
Pics of plugs 1-4 (left to right) Plug/cyl 4 is the issue. Could a faulty plug wire have this effect?
Pics of plugs 1-4 (left to right) Plug/cyl 4 is the issue. Could a faulty plug wire have this effect?
1982 KZ1100-A2
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- T_Dub
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21 Sep 2011 23:03 #478470
by T_Dub
1977 KZ650B1
-810cc
-Cavanaugh Racing Head
-Mikuni RS34's
-GPR Muffler
Replied by T_Dub on topic 120 Main Jets? BS34 carbs
Yeah the first three look fine. Could be plug wire, could be plug, could be float level in that carb. Those would be the first things to check. Swap the plugs and the wires from cylinder 4 to cylinder 1, see if the problem moves to cylinder 1. If it stays rich in cylinder 4, then it's pretty certain to be a carb problem. If it moves, put a new plug in. If it goes away great, if not then its your wire or cap most likely.
1977 KZ650B1
-810cc
-Cavanaugh Racing Head
-Mikuni RS34's
-GPR Muffler
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- Patton
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22 Sep 2011 00:01 #478496
by Patton
1973 Z1
KZ900 LTD
Replied by Patton on topic 120 Main Jets? BS34 carbs
Would also check and assure valve clearances are within specs, especially on #4. And test compression on #4.
And use the clear tube method to determine fuel level in #4 carb float bowl, which might be too high.
Good Fortune!
And use the clear tube method to determine fuel level in #4 carb float bowl, which might be too high.
Good Fortune!
1973 Z1
KZ900 LTD
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- Motor Head
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- FIX UP YOUR BIKE RIGHT AND CHEAP
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22 Sep 2011 00:05 #478497
by Motor Head
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...
Replied by Motor Head on topic 120 Main Jets? BS34 carbs
Also obstructed Air Bleed at Air horn/ Carb bell-mouth, can cause rich running.
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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