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Hi Ray, great work. I especially like the overhead cam setup. What type of carburettor are you using and where did you get it. Thanks.

Hi, I built a free running multivibrator running at 200Hz which is switched by a reed switch and magnet. Output of the multivibrator switches a transistor which switches current to the coil. Used it on several of my IC engines both 2 stroke and 4 stroke. No problems at all. The multi spark...

I have never heard of anyone on this forum using Teflon to make cam followers. I have used it on this small engine and they perform great as they are self lubricating.

Hi I have not received my regular forum update emails for a couple of days. Is anyone else having the same problem.

Looks good.

Hi Paulc, good to see that you have it working. I believe that Tornitore45 in post 6 of this thread has an explanation of the trigger pulse required for the CDI module. He says that it needs to see a negative pulse to arm the unit before the positive pulse. He says that you can use a simple...

Hi Paulc, it is possible that the CDI module might require a high pulse to trigger it. I have only looked at the pulse on my ocilloscope as I do not have a CDI module and it produces a nice clean 10v pulse. Maybe this is not enough. Do you know if it is possible to obtain a schematic of the...

You need to add a pullup resistor from the +ve to the signal terminal of the hall sensor. The resistor and led which you have put there is ok to show that the sensor is working but is not acting as a proper pullup. You can leave the resistor and led and add the pullup as I have shown in the...

You need a pullup resistor from the +ve to the signal wire of the hall sensor and the other mods in my post. I will try to post a diagram later tonight.

Ok after looking at the specs. of the KY-003 I realise that it does work by grounding the signal terminal when it senses a magnet. I was thinking of something else. You need to put a 1K pullup resistor from the +ve terminal to the output terminal of the sensor. You also need a 1K pullup...

Hi, I've noticed that you are using the Arduino hall effect sensor module. That module outputs a +5V signal when a magnet is detected and so will not work with that circuit because it has a PNP transistor which requires a negative signal to the base for it to conduct.

Nick did not have any castings available at the time so I bought the plans off him and decided to make it out of barstock. I'm glad that I went that way because I think that I may not have been able to fit the casting in my lathe.

Hi, I can't find much on the loyal cycle engine on this forum so I decided to post a video of such an engine I built a few months ago. Design is by Nick Rowland.

Hi, I can't seem to be able to post an mp4 video on this post. Can someone explain to me how to attach a video. Thanks.

Hi Ken, that diagram that you got of the internet is correct. The start capacitor is the higher capacitance capacitor. The start capacitor will also have a lower voltage rating than the run capacitor. If your motor is sluggish at starting you may have a faulty start capacitor or the centrifugal...

What's your connections on the other side of the switch?

Hi J, a word of caution and advice. Even though the switch is in the OFF position and the motor is not running, one side of the supply will still remain connected to the motor. This is dangerous and if any electrical work is to be done on the motor the machine must be unplugged from the supply...

Hi Ken, this type of motor is called a capacitor start capacitor run motor. The larger starting capacitor cannot be kept energised for very long but it provides the motor with a large starting torque until the centrifugal switch picks up speed and cuts this capacitor out of the starting...

Hi, I have attached a drawing showing how to connect your reversing switch. Note that U2 is permanently connected to the neutral terminal. The wires that cross do not connect. This will work provided that the wires going to the terminal block of the motor are connected as the photo shows in...

Hi, have a look at the switching diagram that I sent. This is the internal switching of your switch without the links. You will have to link the correct terminals together to make it reverse the motor. I am at work at the moment but if I have some spare time I will draw out the wiring diagram...