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KZ 650 Problem (stumbles off idle)
- onuLine57
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24 Jun 2007 22:29 #152471
by onuLine57
1978 KZ650 B2A
Cincinnati, OH
KZ 650 Problem (stumbles off idle) was created by onuLine57
I bought a 78 KZ650 B2A and I have adjusted the valves replaced the points and condensers and the wires. The carbs have been cleaned and new jets put in. My question is that when I go to open the throttle quickly from idle it will bog down and try to stall. The bike idles fine and runs fine on open throttle but I can’t figure out what the problem is. Does it sound like a carb, ignition timing, of some other problem. One thing that I saw was the bike came with #90 main jets and this seems like it is a little small. Any help would be great.
Post edited by: onuLine57, at: 2007/06/25 13:59
Post edited by: onuLine57, at: 2007/06/25 13:59
1978 KZ650 B2A
Cincinnati, OH
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- Mark Wing
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24 Jun 2007 22:34 #152472
by Mark Wing
Jesus loves you Everyone else thinks your an ***
77 KZ650 C1 with ZX7 forks, GPZ mono rear, wider 18 police wheels and Yoshimura motor.
Yorba Linda Cal.
Replied by Mark Wing on topic KZ 650 Problem
Welcome. The main's seem a little small to me too, I'm not sure but I thought they have 110's but not sure. On the bog you can check the timing advancer to make sure it moves freely.
Mark
Mark
Jesus loves you Everyone else thinks your an ***
77 KZ650 C1 with ZX7 forks, GPZ mono rear, wider 18 police wheels and Yoshimura motor.
Yorba Linda Cal.
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- onuLine57
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24 Jun 2007 22:38 #152473
by onuLine57
1978 KZ650 B2A
Cincinnati, OH
Replied by onuLine57 on topic KZ 650 Problem
Ya I saw that WG said that the 78-79 came with ths small jets and that 102s can be put in i think. I was going to pull the advancer off tomorrow and look at it.
1978 KZ650 B2A
Cincinnati, OH
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- yggy
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- more wrenching than riding!
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25 Jun 2007 03:21 #152493
by yggy
1980 EU-z650 c4 one of the few C's around..
Replied by yggy on topic KZ 650 Problem
Hi there,
sounds to me u might forgot to freshen up the sprakplugs.. (in other words get new ones) I had excactly the same problem . Changed the sparks and hey presto runs like a dream..
sounds to me u might forgot to freshen up the sprakplugs.. (in other words get new ones) I had excactly the same problem . Changed the sparks and hey presto runs like a dream..
1980 EU-z650 c4 one of the few C's around..
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- onuLine57
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25 Jun 2007 08:02 #152539
by onuLine57
1978 KZ650 B2A
Cincinnati, OH
Replied by onuLine57 on topic KZ 650 Problem
sorry forgot that...the plugs are new too.
1978 KZ650 B2A
Cincinnati, OH
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- katjbus
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25 Jun 2007 09:10 #152549
by katjbus
Replied by katjbus on topic KZ 650 Problem
when you see a stumble off idle like that from what i have seen you will probably have to adjust the pilot screw since that is what effects that part of the circuit in the carbs
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- onuLine57
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25 Jun 2007 10:58 #152576
by onuLine57
1978 KZ650 B2A
Cincinnati, OH
Replied by onuLine57 on topic KZ 650 Problem
I have it set at 1 and a half so im thinking i should turn it in a bit and see if it gets better is that correct?
1978 KZ650 B2A
Cincinnati, OH
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- katjbus
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25 Jun 2007 14:48 #152628
by katjbus
Replied by katjbus on topic KZ 650 Problem
The only way to know is trail and error go in first if it gets worse go the other way
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- vach
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25 Jun 2007 15:36 #152641
by vach
1979 kz650 B. Chicago, Illinois
Replied by vach on topic KZ 650 Problem
Do you have a header on it and pods? My bike was doing the same thing on the stock 15 pilot. So I put a 17.5 in it and that helped but ended up w/ a 20 and now I'm all good..
1979 kz650 B. Chicago, Illinois
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- onuLine57
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25 Jun 2007 16:24 #152654
by onuLine57
1978 KZ650 B2A
Cincinnati, OH
Replied by onuLine57 on topic KZ 650 Problem
no its the stock air box and filter and stock exhaust. There is a small exhaust leak where the header and muffler meet on the left pipe though. Im going out now to play with the pilot screw.
Post edited by: onuLine57, at: 2007/06/25 19:25
Post edited by: onuLine57, at: 2007/06/25 19:25
1978 KZ650 B2A
Cincinnati, OH
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- kzwolfsr
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25 Jun 2007 18:17 #152668
by kzwolfsr
1979 KZ SR650, stock candy persimmon red and crossover pipes
1981 KZ 1000LTD with non stock and more comfortable handle bars and 4 into one V&H
Original man of the Caribbean
Replied by kzwolfsr on topic KZ 650 Problem
Mine did the same thing to til I adjusted the air mixture screws just right, but generally I am not sure if these bikes can handle sudden throttle burst like that but be very slight at adjusting air mixtures if you do.
1979 KZ SR650, stock candy persimmon red and crossover pipes
1981 KZ 1000LTD with non stock and more comfortable handle bars and 4 into one V&H
Original man of the Caribbean
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- onuLine57
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25 Jun 2007 19:34 #152693
by onuLine57
1978 KZ650 B2A
Cincinnati, OH
Replied by onuLine57 on topic KZ 650 Problem
Alright I closed the pilot screw a bit and lowered the needle one slot and it seems to be a bit better, I will know for sure after work tomorrow. Another problem im having off and on is that when i push the choke down the rpms want to go up on their own. Any ideas on this?
1978 KZ650 B2A
Cincinnati, OH
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