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Are these CR's 29's?
- KZ802
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1980 KZ750 LTDx2
1978 KZ1000 LTD
1976 KZ900 A
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- baldy110
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1980 KZ750 LTDx2
1978 KZ1000 LTD
1976 KZ900 A
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- KZ802
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1980 KZ750 LTDx2
1978 KZ1000 LTD
1976 KZ900 A
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- Scirocco
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A crappy harbor freight caliper gauge have no 4 mm measurement error.
Pics a welcome with caliper gauge on rubber boots side port.
My 1975 Z 1 B 900 Project
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- zed1015
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This is the size of the carb.
These, like most carbs ( unless they are straight bored/modified ) taper down to the venturi from the air filter side and back out again to the boots.
I know the 33's measure 35.5 at the boot.
They also should have the bore size ink stamped on the bodies so maybe that is still visible somewhere.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
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- DOHC
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KZ802 wrote: So would they measure 29mm at the throat where they go into the rubber carb holders?
Keihin calls the removable aluminum tube on the engine side a "spigot". These are often internally tapered, so they have a different inside diameter at either end. This allows the same set of carbs to be adapter to different bikes with different mounts and different port diameters.
So you need to remove one spigot and measure the inside diameter on the carb side (the threaded side). This should match the diameter of the carb bore and should tell you the size.
They also often have a "29" stamped in ink on the engine side. up near where the throttle shaft goes through the body. But since it's ink it may have been washed off at some point.
The the bottom of this page has show a table of spigots for the CR carbs, with the ID for both ends and the OD.
www.jetsrus.com/carburetor/carb_keihin_C...oded_view_parts.html
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- Dr. Gamma
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If you have a single outlet petcock, just use the center inlet. If you have a dual outlet petcock, I would use just the two outer inlet tees then.
CR's are great carbs once you get them dialed in.
I use the outer two fuel tees on my CR's.
1972 H2 750 Cafe Racer built in 1974.
1976 KH400 Production Road Racer.
1979 Kz1000 MK. II Old AMA/WERA Superbike.
1986 RG500G 2 stroke terror.
1986 GSXR750RG The one with the clutch that rattles!
Up in the hills near Prescott, Az.
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- Dr. Gamma
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I would replace the o-rings around the float needle seats, and the o-rings that go between the screw in spigots, and carb bodies first off.
Don't know what to tell you for jetting on the CR29's, I run CR33's on my bikes. The last time I jetted my CR's in, I had them off and back on the bike like 12 times or so. But now they are spot on across the whole RPM range!!!!
Good luck!!
1972 H2 750 Cafe Racer built in 1974.
1976 KH400 Production Road Racer.
1979 Kz1000 MK. II Old AMA/WERA Superbike.
1986 RG500G 2 stroke terror.
1986 GSXR750RG The one with the clutch that rattles!
Up in the hills near Prescott, Az.
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1980 KZ750 LTDx2
1978 KZ1000 LTD
1976 KZ900 A
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