Help needed with '78 R100/7 - cutting out
I have had this bike for some three years now, and have had it running perfectly - that is, until the other day!
Got it out last weekend from winter storage, put tank back on (off for winter to clean and get all old gas out. Put in new fresh gasoline, and the bike started in probably less than a second. Took for 30 mile ride on Sunday and it ran perfectly!!
However on Tuesday I rode it to work, and about half way there (after about 10 miles) it started cutting out (left side only) on acceleration or hard acceleration up a hill, and I get either total cutting out (on left side only) or partial cutting out.
A couple of days later, I had a replacement carb (rebuilt by a reputable carb guy), so I simply replaced carbs. It ran seemingly better, until I had gone about 1 mile, and the cutting out started out, but not as severe.
Usually this bike runs great and did on that Sunday. It has electronic ignition (Dyna III).
Here are my ideas: could the slide and diaphragm on that side be bad? Why would it just start the problem rather than coming on gradually?
Also, spark plugs - have any of you had such a situation where a plug (when under heavy load) went bad and quit firing? I have - on a Honda once.
How about plug cap or plug wire?
Finally, what about the coil on that side?
Any ideas would be appreciated.