1) Sticking throttle - Disconnect the cable at the carb end. Take the air filter (black round thing) off the front of the carb. Ensure the butterfly is closed. Ensure the throttle cable runs freely through the cable outer. Undo the cable clamps at the throttle end. Reconnect the cable at the carb end. Pull the cable through at the throttle end to take up the slack then tighten the cable clamps.
I can't recall if the Tillotson has positive throttle stops on the carb body. Regardless, press the throttle pedal until the butterfly is fully open. Adjust the pedal stop such that the throttle pedal travels this far and no more. Make sure you have a return spring at the carb end and the pedal end. If the carb does have stops in the body, you should still be using the stop at the pedal end.
If the cable still seems to stick, fit a new inner and outer cable.
2) Sucking in air - assuming nothing is physically damaged, check the condition of the gasket between engine and carb and check the screws on the carb body are nipped up (don't over-tighten them). It could also suck in air from the seals at the crank but that's beyond the scope of this question.
3) Incorrect jet settings (i.e. too lean) - From the sound of it, this is most likely. I can't recall the baseline Tillotson settings, although Focused's are probably about right. Assuming the carb has been correctly built, all should be fine on the settings given. Remember, the high jet is the one furthest away from the engine. If you want to be safe, run the high jet a 1 turn to start with.
If the engine doesn't want to tickover at these settings, don't adjust the jets; these should be adjusted for on-track performance, not sitting idling. If these settings are working on the track but you want it to idle more, adjust the throttle (at the carb body if it has an idle screw or at the throttle cable). We get the carb settings right then set the idle to about 4,000rpm although 2,500 - 3,000rpm will be fine for you.
Finally, if you still can't get it running right ask someone at the track that is also running a cadet. If the carb needs a rebuild, again, someone at the track will help. Not many people run the S60 anymore but most people can help. Make sure you have spare plugs and carb kits at all times.
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Comer starting problem by 'Bootynufc' (06 Apr 2010 @ 15:28)
