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650 Mod's 78 Fighter Build

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30 Jul 2015 20:05 #683539 by 650mod
Replied by 650mod on topic 650 Mod's 78 Fighter Build
Just to give a starting point with what I've done to try and diagnose this issue.

- check float heights and make sure they're within spec- all good
- clean pilot circuit
- clean carbs, fully dismantled, blow air through passages
- disconnect vacuum line from cylinder and run engine- no response
- take spark lead head from problem cylinder and swap with head from ok cylinder- no response
- pull choke circuit apart, check plungers, springs, replace one that was sticky- no response

The only thing I can think of left to do is swap the spark leads out. I can't do this unless I get new coils, because the shop that put new coils in for me epoxy'd the leads in place....

Any ideas anyone? I also have to still put my Dyna in, so who knows, maybe that will sort some of this out...

78 kz 650 custom
Wiseco 720cc big bore
Dynajet stage 3 carb kit with pods
2002 Kawasaki Z750 exhaust
2001 Buell lightning front end
1999 Ninja 600 swingarm with 1999 Ninja 900 rear rim
converted to monoshock rear
Too many goodies to list fully

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31 Jul 2015 06:40 #683585 by 531blackbanshee
Replied by 531blackbanshee on topic 650 Mod's 78 Fighter Build
tight valve????????

leon

skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!

billybiltit.blogspot.com/

www.kzrider.com/forum/5-chassis/325862-triple-tree-custom-work

kzrider.com/forum/5-chassis/294594-frame-bracing?limitstart=0

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31 Jul 2015 10:03 #683597 by 650mod
Replied by 650mod on topic 650 Mod's 78 Fighter Build
Tight as in the bucket is too close to the cam letting too much of a fuel charge in? Could be, but the bike only has 1000 miles on a full rebuild including the head, and everything was shimmed then. I can check it, but not for a little while. My friend and I are taking off for the states this Monday for a week. Trailering to just outside of Duluth, then riding wherever. I ordered a rebuild kit for the petcock just to rule that put. It never hurts when the thing is almost 40 years old...

78 kz 650 custom
Wiseco 720cc big bore
Dynajet stage 3 carb kit with pods
2002 Kawasaki Z750 exhaust
2001 Buell lightning front end
1999 Ninja 600 swingarm with 1999 Ninja 900 rear rim
converted to monoshock rear
Too many goodies to list fully

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31 Jul 2015 10:58 #683607 by kaw-a-holic
Replied by kaw-a-holic on topic 650 Mod's 78 Fighter Build
Duluth, GA? Not that it's close to there but you may want to check this out. tailofthedragon.com/

Jon
1977 KZ1000a1
Mesa, AZ
Phoenix Fighter Project

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31 Jul 2015 11:56 #683613 by 650mod
Replied by 650mod on topic 650 Mod's 78 Fighter Build
No sorry Duluth Minnesota, an hour and a half north of Minneapolis. I'd love to ride the tail of the Dragon. ..

78 kz 650 custom
Wiseco 720cc big bore
Dynajet stage 3 carb kit with pods
2002 Kawasaki Z750 exhaust
2001 Buell lightning front end
1999 Ninja 600 swingarm with 1999 Ninja 900 rear rim
converted to monoshock rear
Too many goodies to list fully

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31 Jul 2015 12:50 #683623 by 531blackbanshee
Replied by 531blackbanshee on topic 650 Mod's 78 Fighter Build
prolly not a tight valve being as how you all just set it up.
btw,
i meant tight as in not enough clearance and the valve not closing completely.

riding around minnesota will be freakin awesome.
my wifes inlaws all live in wis/min i haven't gotten to take a bike up yet tho :angry:

i have been wanting to go to moorhead mn to check out the replica viking ship at
www.hcscconline.org/current-exhibits/hjemkomst-viking-ship/
we are headed back up in september,
leon

skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!

billybiltit.blogspot.com/

www.kzrider.com/forum/5-chassis/325862-triple-tree-custom-work

kzrider.com/forum/5-chassis/294594-frame-bracing?limitstart=0

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31 Jul 2015 13:11 #683627 by 650mod
Replied by 650mod on topic 650 Mod's 78 Fighter Build
Leon- it's more than worth a shot. Who knows, maybe a new guy did the shims and forgot to double check, and I didn't notice the issue before because I didn't have it as dialed in then as I do now.

Ah ok, so a floating valve that doesn't actually seal shut.

Minnesota around Duluth and superior, Wisconsin is gorgeous. The shore of superior is a gorgeous ride. I live in Thunder bay on the north Shore in Ontario, it's so nice.

Oh cool! That would be sweet to see! If you're ever up that way with a bike, let me know. I can head down and go for a cruise.

Devin

78 kz 650 custom
Wiseco 720cc big bore
Dynajet stage 3 carb kit with pods
2002 Kawasaki Z750 exhaust
2001 Buell lightning front end
1999 Ninja 600 swingarm with 1999 Ninja 900 rear rim
converted to monoshock rear
Too many goodies to list fully

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31 Jul 2015 16:23 #683648 by missionkz
Replied by missionkz on topic 650 Mod's 78 Fighter Build
Did you push the little .009", .012" and .016: diameter wires through the relevant passage ways? If not, you have not cleaned the carbs...
To be honest, I don't care what any naysayers have to comment on... if you have not rodded the passage ways in these old carbs, especially if they have been sitting for months to years with gas.... you will regret it. ;) LOL!!
My tools below:
www.kzrider.com/media/kunena/attachments/4138/Carbwire.jpg

Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado

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31 Jul 2015 22:18 #683699 by 650mod
Replied by 650mod on topic 650 Mod's 78 Fighter Build
Mission- I didn't have any wire like that, or a wire tool like that, so I took as small a screwdriver as I could, and scooped out any gunk in any passageways/carb bits. Then soaked in cleaner, repeated, and blew out with air. I agree with you- only the proper tools do the job right and fully.

Alright, so after about 3 weeks of head scratching and wondering what I missed in trying to diagnose my cylinder running rich, I have cured the issue. Drum roll please...... The winner of "who can properly diagnose Devin's strange one cylinder running rich" is...... 650Ed!

I was at my local Kawi dealer today bouncing ideas off the shop guys with my issue, seeing if they could help diagnose. And the vacuum line issue kept coming up, or a valve that wasn't shimmed properly. So I ordered in a rebuild kit for the petcock to be safe, and took the petcock apart when I got home. I thought why the heck not, might as well. Fingers crossed the almost 40 year old diaphragm held together when I took it apart....


Attachment 20150731_231453.jpg not found



And look at what I found... Dried up gas gum in between the diaphragm wall and the backing plate. And there WAS gas going down the vacuum line... So I cleaned the aluminum up as best as I could, and sprayed the diaphragms off. Put it all back together, crossed my fingers and toes and fired her up. And presto, no more running rich and dry fouling the plugs. So out came the Colortune, and the pilot circuit got fine tuned again. Leveled the idle right out, she purrs now. I'll most likely do a vacuum synch tomorrow too just to double check that part.

Thank you so much to everyone who has given their input on the issue. It's great having a support base like this to help you figure out what an issue could be! :)

Devin

78 kz 650 custom
Wiseco 720cc big bore
Dynajet stage 3 carb kit with pods
2002 Kawasaki Z750 exhaust
2001 Buell lightning front end
1999 Ninja 600 swingarm with 1999 Ninja 900 rear rim
converted to monoshock rear
Too many goodies to list fully
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03 Aug 2015 06:56 #684045 by 531blackbanshee
Replied by 531blackbanshee on topic 650 Mod's 78 Fighter Build
glad you got it straightened out devin!

leon

skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!

billybiltit.blogspot.com/

www.kzrider.com/forum/5-chassis/325862-triple-tree-custom-work

kzrider.com/forum/5-chassis/294594-frame-bracing?limitstart=0

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03 Aug 2015 17:51 #684137 by 650mod
Replied by 650mod on topic 650 Mod's 78 Fighter Build
She's back to running rich, I guess there's a micro tear I can't see in the diaphragm, so it's still letting fuel into #2. My rebuild kit will be in when i'm home, so it will be rebuilt then. I'll have to suck it up and ride a little rich til then. I don't think it's bad enough to fuel wash the jug at all, fingers crossed.

78 kz 650 custom
Wiseco 720cc big bore
Dynajet stage 3 carb kit with pods
2002 Kawasaki Z750 exhaust
2001 Buell lightning front end
1999 Ninja 600 swingarm with 1999 Ninja 900 rear rim
converted to monoshock rear
Too many goodies to list fully

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08 Aug 2015 05:47 #684889 by 650mod
Replied by 650mod on topic 650 Mod's 78 Fighter Build
Got home last night from our trip through Minnesota. We stayed just outside Duluth, and rode around there for the first night. Second day packed up and hit Minneapolis. Stayed on the south west side, rode up to the Mall of America, and around there for a bit. There were nasty thunder storms on the way for 2 days later, so the following day we packed up, and went west to Albertville for a little while to check out the outlet stores there. Then took the back highways through smaller towns back towards the I-35, and went north again. Stayed just outside Duluth, and then rode around Duluth again for a bit. Overall, we covered 1,000 miles in the 3 days we rode, and the 650 held up fine. Who knew I'd get the best fuel mileage at 80 mph... I got an average of about 40mpg at 80 mph. Maybe I'll have to ride her like I stole her more.... No issues with the bike other than that diaphragm, but I'm picking that part up today and swapping it out, so she'll be fresh again :)

Devin

78 kz 650 custom
Wiseco 720cc big bore
Dynajet stage 3 carb kit with pods
2002 Kawasaki Z750 exhaust
2001 Buell lightning front end
1999 Ninja 600 swingarm with 1999 Ninja 900 rear rim
converted to monoshock rear
Too many goodies to list fully

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