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February 25, 2004
Robbie,
I think the start point is to loosen the little pinch bolts on the throttle and the choke connecting rods, so that the two carbs can move independently.
Then check that the piston in each will lift and drop back down again cleanly, without catching or sticking. If not, then loosening and re-tightening the two screws that hold the piston chamber on may help to centre it.
More likely you will need to centre the jets. There is a special tool but it realy isnt necessary.
Just loosen the larger (upper) nut on the jet by a half turn, lift the piston and needle up and let it drop into the jet two or three times to centre it, and until it drops "cleanly". Then gently re-tighten the jet. Re-check it and repeat if it is still sticking. Usually dosn't take more than a few minutes to do this properly on each carb.
Check that the choke linkeage on each carb works freely to pull the jet downwards. A common fault is for the small pivot screw on the lever to be done up too tightly.
Check that the throttle butterfly valve opens and closes neatly. The only reason for it not to do so would be corrosion or other damage, or maybe worn shafts, although this would make them loose, not tight!
Only with all these checks should you then re-tighten the clamp screws on the innterconnecting linkeage shafts. There is a proceedure for setting these up correctly as you adjust the carbs, but as this is becoming a long post I will leave that for another story!
Guy
"Guy Weller" < Guy.Weller@... > 30190
Posted on February 25, 2004 08:07 AM
Posted to category(s) Carburetor | Cylinder Head | Drive Train | Engine (external) | Engine (internal) | Miscellaneous | Suspension & Steering | Technical Info | Tuning
