I’m in the process of getting my 1977 GS400X running nicely and I think I’m close! I most recently swapped out my stock points & centrifugal advance system out for a Boyer-Brandsen EIS after I found someone had grinded down the lobes of my advance mechanism. After doing that and tuning the carbs the throttle response is good and power is strong through the power band.
However, while on a long ride the other day (after about an hour) my engine lost power and died while cruising at around 50mph. I pulled over to the side of the rode, turned the bike off, turned it back on and it kicked right over. I rode the rest of the way home with the petcock in Prime mode but the engine died a few times along the way.
Since then I checked the petcock and the screen is clean. Fuel flows freely though while in prime and when I pulled the bowls, they had plenty of fuel.
Does this problem sound electrical to you all? It happens while cruising or while moving slow. Sometimes when the bike is hot and sometimes after it has just warmed up.
Things I’ve done:
1.) I replaced my stock coils with a new 12V 4Ohm coil when I upgraded to the EIS.
2.) Rerouted all my grounds to the frame so they were not mounted to any metal that is painted.
3.) Checked neumerous connections and made sure nothing is lose or making promiscuous connections with other things.
4.) Bypassed my the Run/Off switch.
5.) Checked to make sure the battery terminals were tight.
6.) Checked my spark plugs and they look fine.
Disclaimer: I replaced my stator (I checked it and it is outputting the correct amount of AC voltage) but it looks like I do have a bad R/R. It only outputs around 12.5V even at higher RPMs. The battery is not super low though: it rests around 12.75V before starting.
I’m currently looking for an SH775, but does this sound like the problem or is there something else at play here?
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