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1991 Kawasaki Zephyr 750c1 question(s)

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01 Jun 2024 03:27 #900073 by Robby2894
1991 Kawasaki Zephyr 750c1 question(s) was created by Robby2894
Can anyone recommend a carb to replace the stock Keihin CVK32's? Never been a fan of vacuum carbs. I want instant power and be able to run a different air filter system. Either I want a slide type 32mm carb so it can use the stock intake boots or possibly to use 34mm slide type carbs if anyone knows where to get boots that'd work to fit the carbs to the engine. I want to be able to use pod filters  without issues or just run velocity stacks and lastly don't have to worry about all the lines and hoses or any extra parts that need to be used or are in cv carbs. Not worried about for regulated street use or emissions. My 750 is stock but would like a slightly bigger Venturi that I could use no problem or can handle any upgrades I do in the future and give me more air than a 32 mm is able to. Also has to have a or am able to get for it a throttle system that syncs and mounts the four carbs together as well. 
Not trying to spend an arm and a leg either not looking for a ridiculously expensive set up.
Any recommendations? Thanks

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01 Jun 2024 04:16 #900074 by Scirocco

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01 Jun 2024 04:24 - 01 Jun 2024 04:39 #900076 by zed1015
Replied by zed1015 on topic 1991 Kawasaki Zephyr 750c1 question(s)
Mechanical slide carbs flow more than CV's so an equivalent size to the CVK32's will be miles too big.
Your only real choice is the VM24's from an earlier Z650 ( slightly too small for the 750) or the more suitable sized VM26 / VM28's from a Z900/Z1000 all of which have the same spacing as the Zephyr and just requires the use of the matching VM manifolds with slight modification of their mounting holes to fit along with some jetting changes and air correctors for the pods.
 

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
www.kzrider.com/23-for-sale/611992-air-c...lide-mikunis?start=0





Last edit: 01 Jun 2024 04:39 by zed1015.

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01 Jun 2024 06:51 - 01 Jun 2024 06:56 #900082 by Injected
Replied by Injected on topic 1991 Kawasaki Zephyr 750c1 question(s)
You may want to look into the Keihin CR29, your valve size and cylinder head flow would support that size easily.

A lot of people are running them on KZ650 without issues which has smaller valves/ports. They are a bit pricey new but you can find them used if you look hard enough.

Mikuni RS34 would be OK if you had a big bore engine/cam/ported head. The flat slide carbs generally flow way more air than the same size round slide, usually +2 sizes up (RS34=+36 round)
 
Last edit: 01 Jun 2024 06:56 by Injected. Reason: info

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07 Jun 2024 20:50 #900448 by diamondnik
Replied by diamondnik on topic 1991 Kawasaki Zephyr 750c1 question(s)
Robby, those same CVK32 carbs move a 650lbs Kawasaki Concourse 0-60 in 3.85sec, AND are good for 100hp - which is more than you will get out of the 750 on a budget.  It's not the carbs but your tired engine that is uninspiring.

Kawasaki KZ650C1, GPZ750A1
Honda CB550
Suzuki T20
Yamaha DS7, RD350, RD400
Vespa Sprint 150, P200E

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09 Jun 2024 14:04 #900518 by chopper1963
Replied by chopper1963 on topic 1991 Kawasaki Zephyr 750c1 question(s)
I know a guy who spent thousands of dollars outfitting a 1985 GPz550 with brand new Kehins from Sudco. Another small fortune in jets, slides and needles. Then he had to have a machinist make a bunch of custom manifolds and then modify the tank because the throttle would not fit under it. I def would not have went down this road but he's a lawyer and nobody tells him anything. I think he had $6k in real money into those carbs. And they never did work as well as the OEM CV carbs did.

He actually sold the whole box of carbs and parts for $2k and went back to CVs.

Cautionary tale. Good luck.

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