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  1. 7

    Force 50HP running with cheap Honda 5 Pin AC CDI.

    I didn't realize there was a conversion harness. I just saw $200 a pop used for Force CDIs and figured I'd try another route. These are $26 for a pair of CDIs, 5 pin plug wiring harnesses, and coils. The coils bullet connector into the CDI harness. I put a light on it at idle (which I realize...
  2. 7

    Force 50HP running with cheap Honda 5 Pin AC CDI.

    I just found a document from Vishay on finding the correct size (power rating) for a pulsed load carrying resistor. https://www.vishay.com/docs/48516/_ms9702509-2003-vishaychecklistpulseload.pdf This document says the relationship between continuous and pulsed is that quite a lot more power can...
  3. 7

    Force 50HP running with cheap Honda 5 Pin AC CDI.

    I should also post the original wiring for this engine for reference and to allow for color code correlation to the Force OEM ignition parts. My engine is the Pre-D model in the top half of the diagram. My two original CDI/Coil units are these ones.
  4. 7

    Force 50HP running with cheap Honda 5 Pin AC CDI.

    That is a concern and I'm going only off of what I'd read from the Honda side of things (reported stator voltages). At this point, this only a science experiment until I have some hours of use. It seems it may be workable for my situation since I never go far from the boat launch and can usually...
  5. 7

    Force 50HP running with cheap Honda 5 Pin AC CDI.

    I accidentally shorted 12V to the trigger input on my top CDI. I considered replacing it but at $200 each, I thought... hmmm... as far as I know, it's just a basic AC CDI and coil. Timing advance is mechanical on these engines (not CDI electronic advance). I bet a Honda 5 pin (made for 50cc...
  6. 7

    Prestolite Timing. Center Mark = 30 degrees? 50HP

    Sure. I don't have a (good) picture of the marks on this side of the flywheel on my pc unfortunately. But I drew in what I'm referring to in time on the first picture and. And I have a picture of the flywheel in a random position but I think I can almost make out the center mark and two...
  7. 7

    0.25 Volts AC from stator. But ohms out ok. What to check?

    Sure... Good idea. In my case, it's not going to really be a good example for someone else to follow since it was epoxy past the expiration date. I think it's about 10 years old. It was a good epoxy brand (West Systems 1 gallon kit with pumps), but the epoxy had gone bad with time. I watched...
  8. 7

    Prestolite Timing. Center Mark = 30 degrees? 50HP

    I just checked timing with a light by jumping the shift interlock, moving the shift lever to full throttle (while cranking the engine), grounding the top plug and disabling the bottom CDI (disconnected). First question, does the center mark on the flywheel = 30 BTDC? I put a timing light on it...
  9. 7

    0.25 Volts AC from stator. But ohms out ok. What to check?

    Thread solved. Now have over 300 volts AC measured with a regular meter coming from the stator. The problem was that the magnet ring came unglued from inside my Prestolite flywheel. Epoxied it back in. Already noted in my other thread but may as well note it here for future reference. Also for...
  10. 7

    Does this timing advance rod (1985 50HP) look factory? Should it be bent like this?

    Here's what I have on my own 50HP (a 1987) but I just figured maybe my dad's older generation was different. His in that first picture doesn't look quite right so I did wonder if it was rigged up. I wonder if his timing is affected in a bad way by it. His motor does not run well but he has a...
  11. 7

    Does this timing advance rod (1985 50HP) look factory? Should it be bent like this?

    My dad sent me this picture of his Force 50. This looks like maybe damage. Should this be bent?
  12. 7

    Force 50 HP. Rain got in key switch. Wires smoked. Now Cranks but No Spark.

    It's pretty tight clearance getting the flywheel on but once it's on, it clears and spins just fine. I should run a small (say 0.010") feeler gauge or business card or similar around the edge in a rotation or two to see how tight it now is. It seems to be ok because it's not dragging.
  13. 7

    Force 50 HP. Rain got in key switch. Wires smoked. Now Cranks but No Spark.

    Well the 1987 glue held for almost 40 years. So that's very good. I'm surprised we don't see this failure more often with these old engines. My flywheel is the Prestolite version. It didn't have a lot of glue on the magnet and flywheel. It does now. I double coated both before sticking together.
  14. 7

    Force 50 HP. Rain got in key switch. Wires smoked. Now Cranks but No Spark.

    Reglued the magnet to the flywheel and I now have around 300VAC (no DVA) coming out of the two blue wires from the stator. So it should run again if all goes well. Nice when things kind of turn out. I say kind of because I haven't hooked it all back up yet. Going to let the epoxy cure a few days...
  15. 7

    Force 50 HP. Rain got in key switch. Wires smoked. Now Cranks but No Spark.

    I will probably use my West Systems standard marine epoxy since I have it on hand and don't want to spend $75. But here's what I found in another thread here (looks to be good info):
  16. 7

    Force 50 HP. Rain got in key switch. Wires smoked. Now Cranks but No Spark.

    Ok you guys talked me into building a DVA. It's still reading very low on charging and spark generating coil. Like right around a volt DC there. I think I found the problem. Still not sure why the smoke however. The magnet had come unglued from the flywheel due to rust, heat, and time (it is a...
  17. 7

    1 ohm resistance across 1987 50HP charging coil. Ok?

    I couldn't find a chart for this coil online. I don't believe I'm getting either charging or ignition voltage from this stator. I get 750 ohms on the ignition coil of the stator and just 1 ohm on the charging coil.
  18. 7

    Motor dies then won't start

    Also, it can have a clog somewhere in the fuel system (tank pickup strainer in tank>>fuel lines>primer bulb>fuel lines>fuel pump screen filter>fuel lines>carb. All of that can eventually plug with use. The pickup in the tank is where I'd start then work your way to the carb. Also, air can get in...
  19. 7

    Force 50 HP. Rain got in key switch. Wires smoked. Now Cranks but No Spark.

    This is the two blue wires for generating CDI energizing voltage. This is AC so there should be no polarity here. I need to check the rectifier feeding taps from the stator and the DC after the rectifier too and see if it's putting out battery charging voltage when cranking.
  20. 7

    Is this article true? I have had pretty good luck with Force motors.

    This article makes Force look like an antiquated company with engines that quickly detonate to destruction. I've never had any trouble with the mechanics (moving metal parts) in my force engines. Have I just been lucky? https://everythingaboutboats.org/chrysler-force/
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