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Rejetting GS1150 bored to 1199 for Weisco Piston kit

  • Thread starter Thread starter robert_r_lefebvre
  • Start date Start date
R

robert_r_lefebvre

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I've bored out my GS1150 to accept the Wisco 1199 piston kit. Does anyone have an idea on how much the jetting should change? Do I simply change the main jet by 2 sizes?

Thanks
Bob
 
I would only go up 1-2 sizes on the main jet to start with. You will also need to re-adjust the mixture screws as the bigger bore will increase the vacuum signal to the carbs & pull more fuel. You may even find that the needles will need to be a little richer. Ray.
 
I would wait and when run in do a plug chop, my GSX1100 SZ katana always ran slightly rich on the standard jetting, after a rebore and wiseco 1166 pistons plus a K&N replacement panel filter the mixture on standard jets was spot on.
 
Thanks for replying Ray, when you say that I may need to adjust the needles, what exactly are you refering to?

Thanks
Bob
 
The needles inside the carb slides. If you don't have a jet kit, with adjustable needles, in your carbs that needs to be your next purchase. Are you running stock exhaust? Ray.
 
Do you want more power or are you just one to like it all stock? I ask because there is a pretty good gain in power & weight reduction if you go to a 4 into 1 & individual filters. If you want, give me a call at 714-356-7845 as it will be easier for me to talk on the phone than to type all this stuff out. Ray.
 
Thanks Ray, I'll call you on Wednesday.

I'm in Ottawa Canada, what would be a good time for you?
 
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