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Rank: n00b
Groups: Member
Joined: 1/3/2010
Posts: 2
Location: WAKEFIELD
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HI HAS ANYONE TRIED USING BIGGER CARBS ON THERE BIKE FROM STOCK CARBS,I HAVE SOME ZR750F CARBS WHICH LINE UP PERFECTLY I JUST GUESSED WITH A BIGGER INTAKE OF AIR AND THE CARBS SET FOR A 750 ID GET MORE FUEL AND AIR INTO THE ENGINE TO CAUSE MORE BANG FOR MORE MOTION BUT BEING NEW TO BIKES IM NOT SURE PLUS WOUNDN'T KNOW IF THERE ARE ANT MORE ASPECTS I SHOULD BE WORRIED ABOUT
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Rank: MSF graduate
Groups: Member
Joined: 4/26/2008
Posts: 25
Location: San Francisco, CA.
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Whay change from the CV30's? I'm running a lot of bolt-on mods, minus the cams, and still getting good air/fuel with the stock TK27 Carbs. I know another GPz550 Owner that is running the Zephyr CV30 Carbs with a 615cc Kit too.
GPz550 Race Bike Stuff: http://smg.photobucket.com/albums/v97/CoreyClough/Track%20Bike%202009/GPz550 Pictures of Stuff I've Done: http://smg.photobucket.com/albums/v97/CoreyClough/Coreys%20GPz550%20Pics/YouTube Videos: http://www.youtube.com/user/CoreyDSFACorey San Francisco, CA (The Straight Part) AFM #944
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Rank: n00b
Groups: Member
Joined: 1/3/2010
Posts: 2
Location: WAKEFIELD
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its only cause i had them laying around and mine are naffed big time ,going to have a look at these links next thanx for your help
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Rank: Administrator
Groups: Administration
Joined: 4/23/2008
Posts: 222
Location: Catskill Mtns.
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Short answer is that if you go too big you lose the pressure drop in the carb throat that draws fuel into the airstream. Otherwise, bikes would all have massive carb throats as there would be no downside. Smaller throats mean better metering of fuel and better atomization. Unless you have done some substantial work to your bike to make a LOT more power at the very top end of the engine's rev range, you'll only hurt the bike's throttle response and fuel economy by making a sizable upward jump in carb throat size.
| 1990 Kawasaki Zephyr 615 (Daphne) -=- 1986 Kawa Ninja 250 (stolen) | | The Motorcycle Fuel Injection Handbook -=- http://tinyurl.com/297abo |
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Rank: n00b
Groups: Member
Joined: 9/23/2010
Posts: 1
Location: Oregon
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Brand new to the forum.
With a highly modified and bored out GPZ550, are the 27mm or 30mm carbs advised and if so the 30mm, what donor bike would they come from.
Thanks for the response in advance, Pugs
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Rank: Administrator
Groups: Administration
Joined: 4/23/2008
Posts: 222
Location: Catskill Mtns.
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I have found the 550 motors to be limited by valve size once you remove the airbox and use a free-flow exhaust; even bigger cams don't net a whole lot more. The CV30K carbs are probably the best for street and most race, while you might get a LITTLE bit more way up top with 32mm carbs. Unless you never let the bike drop below 7k rpm, you'll never notice the difference compared to 30mm carbs. The 30CVKs came stock on Zephyr 550s, and almost identical carbs were also fitted to the 600 Eliminator. If you are going to install a jet kit, either set of carbs will do. They will bolt straight up with Zephyr 550 intake boots, either set.
| 1990 Kawasaki Zephyr 615 (Daphne) -=- 1986 Kawa Ninja 250 (stolen) | | The Motorcycle Fuel Injection Handbook -=- http://tinyurl.com/297abo |
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