QuestionI have a 10 hp kohler on a 125 ford L/G tractor I can't seem to get the carb to smooth out when I adjust the high speed jet.
Do you have any idea what's wrong.
AnswerBill
Have you tried doing the low speed needle yet adjust both needles 1 1/2 turns start the engine and slowly give it more fuel and adjust it with the low speed idle until it soothes out.
I have had people give me mowers that would only start once you put fuel in the carb and eventually die. The problem was a cracked fuel cap. Look over your cap and give it a shot. portantly, you can only expect the carb to work as well as your engine does; the performance of your carb cannot make up for a weak or worn out engine. Another point to stress here is that you may not be able to achieve maximum performance from your engine simply by changing jets in the carb. A mismatch of engine components and or porting may create a carburetion nightmare. The best advise is to use quality parts and service from reputable dealers. To achieve an accurate calibration with a carb you should adjust the tuneable circuits in the following order:
1. LOW SPEED ADJUSTER -To adjust a smooth idle
2. POP-OFF PRESSURE -Just off idle to 1/4 throttle in conjunction with the low speed jet.
3. LOW SPEED JET -Just off idle to 1/3 throttle.
4. HIGH SPEED JET - 1/3 to 3/4 throttle.
5. HIGH SPEED ADJUSTER -3/4 to wide open throttle.
The reason for adjusting the circuits in this order is because several circuits contribute to the total fuel delivery of the carb. Changing the low speed jet for example, affects wide open throttle fuel delivery to some degree The exceptions to the rule are the low speed adjuster and the regulator portion: the low speed
adjuster has no effect past 1/3 throttle. The regulator portion has no tuning effect past 1/4 throttle, although it continues to control the fuel supply.
