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kz550 Big Bore 615cc Yeah or Nay? 11 May 2016 14:00 #725782

  • Kirkpatrick
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Anyone have success with the 615cc big bore kits? I have an 83 kz550a4 Sport which I love to death and just bumped the front sprocket to 17T for more top end. I am actually thinking about going to 18T but the clearance is super tight right now at the front sprocket guard. The bike is a screamer but at 6-01, 215 pounds (me), It is still quick as ever but I need more top end. Was wondering if the 615cc kit is worth the money down the road and/or if there are other mods that can be done. Already have the exhaust, pods, and jet kit done. I am not looking to get on the freeway and take long trips just to scream around town but if need be, hit the freeway. Hits 60 mph at about 5500 rpms and it does not help that I have an open Lossa Eng. pipe on it which screams.
1983 Kawasaki KZ550
1983 Suzuki GS1100ED
1982 Suzuki SZ1000 (Katana)
1997 Honda CR500

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kz550 Big Bore 615cc Yeah or Nay? 11 May 2016 14:09 #725786

  • SWest
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If you install a baffle it will help the top end.
Steve

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kz550 Big Bore 615cc Yeah or Nay? 11 May 2016 15:48 #725812

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It has a MAC header and I think it is a 2-1/4 muffler on it. Have to confirm that or does anyone know that MAC OD for that header? I looked online and can't find much of a selection for 2-1/4 or 58mm. Can I get a 2-1/2 and use a sleeve/spacer?
1983 Kawasaki KZ550
1983 Suzuki GS1100ED
1982 Suzuki SZ1000 (Katana)
1997 Honda CR500

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kz550 Big Bore 615cc Yeah or Nay? 11 May 2016 15:53 #725815

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Pic of the header?
Steve

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kz550 Big Bore 615cc Yeah or Nay? 11 May 2016 16:28 #725824

  • Kirkpatrick
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Here you go
1983 Kawasaki KZ550
1983 Suzuki GS1100ED
1982 Suzuki SZ1000 (Katana)
1997 Honda CR500
Attachments:

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kz550 Big Bore 615cc Yeah or Nay? 11 May 2016 16:34 #725826

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That's a tough one. You'll notice more grunt in the low end with the overbore.
Steve

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kz550 Big Bore 615cc Yeah or Nay? 11 May 2016 16:35 #725827

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Really like that header and can combo, is that one of the Dime City Cycle stainless shorties? Very good looking! :evil:

Brett
All the gear all the time!

1985 Kawasaki GPz 750 (ZX750-A3) 15,000 original miles www.kzrider.com/forum/11-projects/601230...z750-refresh-project

Father - Husband - Bourbonr - Rider

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kz550 Big Bore 615cc Yeah or Nay? 11 May 2016 16:48 #725833

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Irish-Kawi wrote: Really like that header and can combo, is that one of the Dime City Cycle stainless shorties? Very good looking! :evil: Brett


It is a Lossa Engineering 12" Cone. Here is a video of it running although I butcher the name of it at the end of the Video.

1983 Kawasaki KZ550
1983 Suzuki GS1100ED
1982 Suzuki SZ1000 (Katana)
1997 Honda CR500

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kz550 Big Bore 615cc Yeah or Nay? 12 May 2016 06:56 #725909

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Just my opinion because I used to own a KZ550, with those pods I doubt you'll ever get top end performance. I'm 5'9" at 200 lbs and I had no problem with top end speed but I had stock air box and OEM filter and stock exhaust. Maybe some more carb tuning would help.
Don't fix it until it's broken.
John

83 KZ550M1
83 KZ1100LTD

Also own:
2010 Harley Ultra Classic Limited, 2008 Harley low rider 71 CB350/sidecar

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kz550 Big Bore 615cc Yeah or Nay? 12 May 2016 07:25 #725921

  • rrsmsw9999
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I agree. Go back to stock.and u can go 100 mph whenever u want . 5.8 205
1980 KZ 1000E2
Crashed 6/2016

1980 KZ550A
Sold 3/2016

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kz550 Big Bore 615cc Yeah or Nay? 12 May 2016 07:36 #725925

  • car5car
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it will not increase value
96 Yamaha Royal Star
82 Yamaha Virago 920

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Last edit: by car5car.

kz550 Big Bore 615cc Yeah or Nay? 12 May 2016 07:43 #725928

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Who cares? I own bikes so I can ride them, not SELL them. :S
Steve

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