Ignition trigger systems

[G-Body]

I have been looking into programmable ignition systems for 428 cuyuna that powers my ski-free. Being that ignition components are difficult to find and I have an extra engine thats missing the ignition I wanted to try to put a newer programmable ignition on. The biggest hurdle I see is trigger systems. I could easily come up with a polarity based trigger system like the factory used, but I don`t think there`s a programmable ignition that will work with those. I think the new 62t zeel would work if I swapped in a 62t pickup coil, but I`m not sure if that would generate the same voltages as I`m sure the magnets are a different strength. The more labor intensive option I see would be to use the newer pickup like a 760/800/SXR uses, but that would allow a much wider selection of ignition systems like zeel, ignitech, procom, GY6 scooter. I think I could either put a rotor on the front of the flywheel or machine down the OD of the flywheel to create the 2 bumps needed to trigger the pickup. The issue that I`m not sure about is size of the trigger points. Based on what I could find online the leading edge of the point is the most advance that the ignition can have (unless it calculates back from the previous bump which is less stable).

1. What does the length of the bump change? I think it only affects timing during cranking if you set the ignition to trigger on the following edge to retard timing during cranking?
2. Height. Based on the way the sensor works I`m guessing that there is a minimum height which is required to make the sensor produce voltage, then height may increase voltage up to a maximum height at which point the sensor still works but adding height will no longer increase voltage? Does anyone know how to determine the minimum required height other than trial and error?

 

[Quinc]

I talked to an old employee at wetjet and his recommendation for this engine was more compression. On my 428 (wetjet) I swapped the bn38 to a sbn38 and dried out the pipe. It really woke up the ski up and improved low and top end. Might be worth trying as well.

WetJet (Picklefork style) restomod

"Wetjet International its first manufactured personal watercraft in 1987. They designed their PWC's in the same style as snowmobiles, which came natural for the Minnesota based company. It featured a butterfly steering wheel with simple controls and electric start. The earliest models were...

www.x-h2o.com

 

[G-Body]

I have one of the spare motors setup with a SBN38 which seems to make that motor start up much nicer when it is hot. I`m surprised these would take more compression, I thought that I found somewhere that the compression ratio is 12.5-1. I was planning on drying the pipe out a bit as I had read how well that worked for you.

I still want to do a programmable ignition as earlier in the year I changed my timing and noticed a big difference. I had the timing retarded and I set it to factory spec. When I did I gained more bottom end like I expected, but lost quite a bit of topend. Since ignition components are hard to come by and I can pick up a programmable ignitech unit for $160 that would also let me put the automatic start setup back on so that I don`t have to swim back to the ski-free to start it I wanted to give it a try. I swapped a zeel onto my superfreak at the end of summer and its amazing.