How To Adjust the Accelerator Pump On the 40mm Mikuni Carburetor

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Filed Under (Yamaha) by admin on 21-01-2012

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1) The “blue” colored screw in the image is the duration adjustment screw. Underneath the head of the screw is a lock nut and the bracket arm that the screw is threaded into. To decrease the amount of fuel squirted the adjustment screw is turned “clockwise” or in. To increase the amount of fuel squirted the adjustment screw is turned “counter clockwise” or out. To get the max, amount of decrease remove the screw and take the lock nut off of the screw. Then replace the screw into the cam arm, then replace the lock nut underneath the arm on the screw. this gives you another 3/32″ of an inch in which the screw can be screwed in.
2) Turn the adjustment screw fully clockwise or IN. Start your engine, Blip your throttle open, if the engine stutters, (hesitates), it is not getting enough fuel so turn the screw counter clockwise to increase the amount of fuel squirted from the accelerator pump into the carburetor. Keep blipping the throttle and adjusting the screw till the carburetor starts to cough. Stop here and turn the screw back in till the coughing stops. Tighten down the lock nut. This should give you the best throttle response with the least amount of coughing and backfiring out the carburetor. Timing Adjustment Screw This is the “Green” colored screw just above the Blue duration adjustment screw. The” Mucker” said it best,,,,, This upper screw adjusts the “timing” of the squirt. By altering it’s setting, you can advance or delay the onset of the fuel squirt. But probably, it won’t have to be touched

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BMW K 1300 S, K 1300 R and K 1300 GT SPECIFICATION

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Filed Under (BMW) by admin on 17-11-2010

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The K 1300 S with 175 hp, the K 1300 R with 173 hp and the K 1300 GT with 160 hp. The new K bikes feature updated transmission and clutch assembly, plus smoother engine performance and new switchgear. Von Kuenheim continues: “By raising capacity to 1300 cc, our engineers have not only increased output but also torque on all three models. At the same time the driveline was intensively revised from air/fuel mixture formation right through to the exhaust system. In this way we have been able to optimize partial load behavior as well as throttle response. Now the clutch can be operated with even less effort and with greater refinement. Shifting has been improved tangibly due to constructional changes to the gearbox and drive.” BMW is introducing new options for the 2009 as well. The popular Electronic Suspension Adjustment that first appeared on the 2005 K 1200 S has now been updated with even more on-the-fly adjustability and it’s called ESA II. Also new is the quick-shifter option, racing-style gear shift assistant, borrowed from BMW’s race-ready HP2 Sport. Automatic Stability Control (ASC) is also offered as an option on the new K bikes. “Both the K 1300 S and also the R will also have the shift assistant – familiar from the HP2 Sport – available as an option for the first time,” von Kuenheim emphasized. “We have also advanced the chassis. The new lower longitudinal strut is now made of aluminum and is thus considerably lighter. This makes the front wheel guidance response even more sensitive. The result of this comprehensive development work is superior handling, improved rideability and lower fuel consumption. The electronically adjustable suspension – called ESA in short – was launched as a world first on the K 1200 S. Now we are presenting the new, well-proven ESA II as an option for the K Series. Apart from the suspension and damping this unique system also allows the spring rate to be adjusted at the press of a button. The K Series model revision also heralds a new and innovative generation of switches and controls.

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