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Old 04-05-2013, 05:30 PM   #1
B_C_Ries OP
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Location: Imperial Valley, California
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Working on my 100/7

I decided to put new spark plugs into my 1977 R100/7 she ran pretty good for a day, but the following day she would run out of power and sputter at 4,500 rpm.

I decided to change and adjust the points, she ran better but still ran out of power and sputtered at 4,500 rpm.

Then I looked at the Carburetors, the left one had a torn diaphragm, I rebuilt both carburetors and adjusted them as written by 190e in a different thread, again she ran better but stuill ran out of power and sputtered at 4,500 rpm.

by yanking on the throttle cables I determined that the Bike would rev to redline with just the right cylinder but only would rev to 4,500 with just the left cylinder,

I decided to adjust the valves, The right ones were right on and the left ones were a bit tight but still had some clearance.

again the left cylinder ran out of power and sputtered at 4,500 rpm.

I switched the spark plug wires and there was no change,

Then I saw one of my old plugs on my garage floor, I removed the new spark plug, it looked fine nice light brown color gap looked good,

I put in the old sparkplug and now she runs great. actually she runs better than she has in years,
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Old 04-05-2013, 05:42 PM   #2
disston
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Could you explain a bit. You pulled the new plug out and it looked the right color but the old plug worked better? It's great you got the bike running but what was it that fixed it?
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Old 04-05-2013, 05:47 PM   #3
Overdog
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had a defective plug????
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Old 04-05-2013, 05:48 PM   #4
Bill Harris
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And what were the brand and heat range of the plugs? Old and New?

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Old 04-05-2013, 05:54 PM   #5
B_C_Ries OP
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Bosch Super W5DC old and new. I bought all of them several years ago and grab them off the shelf when I need them,

plug seems have been the problem
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Old 04-05-2013, 06:22 PM   #6
boxerboy81
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More evidence to go back to the last thing done, check, double check or reverse the work.

At least you didn't spend a shedful chasing the problem.
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Old 04-05-2013, 06:34 PM   #7
B_C_Ries OP
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The fact that everything was fine for at least a day after I changed the plugs confused me,

fortunately everything I did should have been done and made the bike run better.
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Old 04-05-2013, 07:31 PM   #8
Bill Harris
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A bad sparkplug is rare, but can make you chase your tail. At least you got the torn carb diaphragm fixed, and that was most likely to cause the problem.

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