Jays100
Veteran Member
I think that if this bike has sat for some time, that other influences are present, specifically in the electrical system and quirks of the bike.
To begin, a healthy battery is a must. If not present, the difficulties may be insurmountable so do yourself a huge favor and ensure battery is good. At this point we assume good compression, valves adjusted, cam chain, carbys clean, clear filters, clear fuel flow - the easy things. What I'm thinking from the general clutch discussion is this may be a run out engine where age, corrosion, humidity are in a conspiracy against you. Don't assume something functions well just because its clean. Conversely, the corrosion present in the points cavity/advancer mechanism photos, lead me to believe this one will need more than just basic parts.
Another thing looming are the spark plug caps. New, they meter out at pretty much dead on 5000 ohms, or 5K ohms. As they age, the resistance just increases so if their ohm resistance measurements are 8K or greater will have a much weaker spark. it'll be of long duration, but very, very weak. Good caps are as imperative as a good battery in order of importance. At least that is my experience. Anything greater than 10K ohms and there won't be any spark energy left to ignite internally, much less run properly.
Also assumed are good, if not new, spark plugs. Check resistance of the coils, no cracks, good connections, no cracked or pinched wires to the points. Again, basic stuff.
As an aside, if the advancer sticks, the idle will hang at 3-4000 rpm and won't respond to idle speed adjustment. But, that's a later problem to just getting it to run in the basic sense.
I hope this helps to troubleshoot this particularly quirky engine. I still learn from the posts here and am grateful the forum exists!
J
To begin, a healthy battery is a must. If not present, the difficulties may be insurmountable so do yourself a huge favor and ensure battery is good. At this point we assume good compression, valves adjusted, cam chain, carbys clean, clear filters, clear fuel flow - the easy things. What I'm thinking from the general clutch discussion is this may be a run out engine where age, corrosion, humidity are in a conspiracy against you. Don't assume something functions well just because its clean. Conversely, the corrosion present in the points cavity/advancer mechanism photos, lead me to believe this one will need more than just basic parts.
Another thing looming are the spark plug caps. New, they meter out at pretty much dead on 5000 ohms, or 5K ohms. As they age, the resistance just increases so if their ohm resistance measurements are 8K or greater will have a much weaker spark. it'll be of long duration, but very, very weak. Good caps are as imperative as a good battery in order of importance. At least that is my experience. Anything greater than 10K ohms and there won't be any spark energy left to ignite internally, much less run properly.
Also assumed are good, if not new, spark plugs. Check resistance of the coils, no cracks, good connections, no cracked or pinched wires to the points. Again, basic stuff.
As an aside, if the advancer sticks, the idle will hang at 3-4000 rpm and won't respond to idle speed adjustment. But, that's a later problem to just getting it to run in the basic sense.
I hope this helps to troubleshoot this particularly quirky engine. I still learn from the posts here and am grateful the forum exists!
J