Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1

TOPIC:

Wiseco 615 Big Bore Kit 08 May 2021 23:08 #848242

  • Stereordinary
  • Stereordinary's Avatar Topic Author
  • Offline
  • User
  • Posts: 318
  • Thank you received: 98
I’ve been thinking that I may someday want to get the Wiseco big bore kit that would punch my ZR550 out to 615cc, but I have to admit that there are some things about it that mystify me. I’m hoping you all can shed some light on it. 

I suppose my big question is about longevity. Does the bigger displacement produce more heat and wear and tear on  the motor and is it a mod that shortens the life of the bike? Or is that not a problem? 

I gather that the engine has to be bored out and that’s no small job, but something that should be done by a reputable shop. So does anyone know a good shop in the Portland area? Or can Wiseco provide the service? Same with the dyno testing, how do I know the shop I take it to knows what they’re doing? 

I guess maybe I’m just nervous about the idea. On the one hand it sounds like the best option for really getting maximum performance out of my bike. But I don’t want to risk ruining what’s already a good thing. Help? 
A breeze from the west.
‘90 ZR550 Zephyr aka “Zephanie”
‘90 ZR550 Zephyr aka “Goldie Brown”

Please Log in or Create an account to join the conversation.

Wiseco 615 Big Bore Kit 09 May 2021 02:50 #848245

  • zed1015
  • zed1015's Avatar
  • Away
  • User
  • Posts: 2788
  • Thank you received: 1324
Done correctly the increase will not have any adverse affects on longevity or reliability.

 
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





Please Log in or Create an account to join the conversation.

Wiseco 615 Big Bore Kit 10 May 2021 09:24 #848302

  • Stereordinary
  • Stereordinary's Avatar Topic Author
  • Offline
  • User
  • Posts: 318
  • Thank you received: 98
Thanks for that. Are there any other considerations I should be thinking about? Will the carbs need to be re-jetted? 
A breeze from the west.
‘90 ZR550 Zephyr aka “Zephanie”
‘90 ZR550 Zephyr aka “Goldie Brown”

Please Log in or Create an account to join the conversation.

Wiseco 615 Big Bore Kit 10 May 2021 10:06 #848304

  • zed1015
  • zed1015's Avatar
  • Away
  • User
  • Posts: 2788
  • Thank you received: 1324
It's not much of an increase per cylinder and all you may have to do is go up a size on the main.
If the increase in bore size is within stock oversizes and compression you wouldn't need to rejet but if you have an increase in compression then you will.
Always start a few sizes larger and work down.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





Please Log in or Create an account to join the conversation.

Wiseco 615 Big Bore Kit 17 Sep 2023 17:26 #889474

  • Stereordinary
  • Stereordinary's Avatar Topic Author
  • Offline
  • User
  • Posts: 318
  • Thank you received: 98
I have a friend offering to sell me his unused Wiseco big bore kit and an already bored and sleeved cylinder block, and I just want to make sure it will fit my bike before I buy it. We're both pretty sure it will, but just for peace of mind, here are the details.

Here's the kit: www.svspowersports.com/products/wiseco-top-end-rebuild-kit-k615

And the bored and sleeved cylinder block is from an '81 GPZ550.
 

If anyone knows for sure that both will fit, I'll get both. But if the cylinder block doesn't fit that's ok, I would still pick up just the Wiseco kit.
A breeze from the west.
‘90 ZR550 Zephyr aka “Zephanie”
‘90 ZR550 Zephyr aka “Goldie Brown”
Attachments:

Please Log in or Create an account to join the conversation.

Wiseco 615 Big Bore Kit 18 Sep 2023 07:45 #889504

  • Nessism
  • Nessism's Avatar
  • Away
  • Sustaining Member
  • Posts: 7094
  • Thank you received: 2524
One bit of good news is that both the base gasket and head gasket are the same between your bike and the early 550.  Also, the cam chain tensioner shoes seem to be the same as well, although the tensioner assembly itself is different.  You may need to get an early tensioner.  Overall, it seems likely that you can make those parts work with your bike.
The following user(s) said Thank You: Stereordinary

Please Log in or Create an account to join the conversation.

Wiseco 615 Big Bore Kit 20 Sep 2023 21:58 #889582

  • Stereordinary
  • Stereordinary's Avatar Topic Author
  • Offline
  • User
  • Posts: 318
  • Thank you received: 98
I bought it. 

 
A breeze from the west.
‘90 ZR550 Zephyr aka “Zephanie”
‘90 ZR550 Zephyr aka “Goldie Brown”
Attachments:
The following user(s) said Thank You: gordone, howardhb, Wookie58

Please Log in or Create an account to join the conversation.

  • Page:
  • 1
Powered by Kunena Forum