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| Mikuni VM - late model series http://www.mikuni.com/pdf/vmmanual.pdf | Mikuni VM - late model series http://www.mikuni.com/pdf/vmmanual.pdf | ||
| + | |||
| + | == BS34 == | ||
| + | 90 hp 1980- Suzuki GS1000 | ||
| + | 102 hp 1981 Kawasaki KZ1000 | ||
| + | |||
| + | http://www.mikesxs.net/parts/img250/48-0667.jpg | ||
| + | |||
| + | Tuning kit | ||
| + | * Pilot jets | ||
| + | * Needles | ||
| + | * Main jets | ||
| + | |||
| + | |||
| + | BS34 Jet Needle | ||
| + | <br>http://www.mikesxs.net/parts/img250/48-0663.jpg | ||
| + | |||
| + | 5IX11 richer | ||
| + | 5HX12 leaner | ||
| + | |||
| + | |||
| + | Needle Jet | ||
| + | <br> http://www.mikesxs.net/parts/img250/48-0662.jpg | ||
| + | |||
| + | Needle Jet | ||
| + | Y-O | ||
| + | 336-Y0 | ||
| = Photo Index = | = Photo Index = | ||
Revision as of 06:31, 4 May 2014
Motorcycle carbs, bike carbies. Flat-slide, constant vacuum or variable venturi carburetors.
Contents |
Overview
TUNING is critical. Bike carbs as-is run poorly on automotive engines. But with the right jet or needle selection they can run very well.
Keihin Flat CR (FCR)
bike carbs on A12Y engine
Matsuoka MSR carbs
adapt carbs from your favorite motorcycle
Suzuki GSX-R (aka GSXR)
Yamaha YZF-R1 (aka R1) carbs are a fad in USA as of 2012.
ヤマハ
Adapter Kits
Fumiya Kit
Datsun 1200 enthusiasts Fumiya sells these
Keihin FCR
rallytwit made 73.22 RWHP on his A-series.
39mm FCR carbs with a near standard GX motor; ported head, headers 2 inch exhaust and 14lb flywheel. As far as reliable FCR carbs are stone axe reliable. For street (or racing) use you would have to do some tuning but it's not a big deal. I only needed an hour of dyno time to get the car 95% dialed. My only problems were because the carbs were on 175HP A-series powered sports racer so the jets were way off what my motor needed............lots of guys use these on street bikes and they are standard equipment on MX bikes. 32MM would likely be better for a street car, the 39's on my car border on over-carbed. As fars as how the motor runs they are the bomb the motor sings......revs like mad and instant throttle response.
Matsuoka MSR
Matsuoka MSR are like FCR but about $1000 US cheaper. They use the same sliding throttle valve design. They're made by Mikuni. Manifold can be any DCOE (Weber/Dellorto/Solex) type.
new, jetted to your spec: 96K yen (1230 AUD) or with manifold and linkage closer to 200K yen.
Feral said:
When I say just about as good as injection I mean the low speed response from the Mikuni flat slides is incredible. It will still not be as accurate as any well laid out injection system, but really do work very well
Mikuni
Mikuni also made constant velocity (CV) carburetors. The venturi size is what sets the HP characteristics. CVs use the same bore size as venturi size except for a fixed obstruction to generate vacuum.
Mikuni BS series. For example 1980- Suzuki GS1000 came with BS34 carbs (34mm) for 90 HP. A 1981 Kawasaki KZ1000 fitted with BS34s made 102 HP.
Mikuni BS series "Round Slide" variable venturi constant velocity design
These being CV carburetors are similar to SU carburetors. They have a traditional butterfly throttle but the actual airflow is controlled by the round slide (piston) that floats up by vacuum action. It is opposed by the dome spring.
Mikuni VM - late model series http://www.mikuni.com/pdf/vmmanual.pdf
BS34
90 hp 1980- Suzuki GS1000 102 hp 1981 Kawasaki KZ1000
Tuning kit * Pilot jets * Needles * Main jets
BS34 Jet Needle
5IX11 richer 5HX12 leaner
Needle Jet
Needle Jet Y-O 336-Y0
Photo Index
fcr,msr,keihin,cycle carb,bike carb
Uploads
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