Just Shaping a Milestone

[cbclemmens]

[cbclemmens]

Somehow I posted that without text. That's my 1971 R 75/5 that I just rolled over to 50 K miles.

I parked it just before Christmas resting on the side stand. Last week it got back up above 50 so I rolled it out, checked the tire pressure and all the fluids, charged the battery and started it up. It started up ok but ran rough. I opened the choke up and it was still running real rough, like only one cylinder was firing. I let it warm up and the dew started boiling off the right side but not the left. I shut it down and pulled the left plug. It was wet and oily so I cleaned it on the wire wheel, hooked it back up and set it on the jug. I started it up and watched the spark. It was there but very weak. I put the plug back in and started it up. It ran a little better but still a little rough. I decided to drive it around a bit and warm it up. It ran a little better as I did and every once and a while it would surge for a second or 2. After 3 or 4 miles I stopped at a stop sign and then pulled out onto the highway. It was running better but still not quite right. I accelerated up to 4,500 RMP and shifted into second. I cracked the throttle and it almost pulled both arms out of their sockets. Obviously the engine had gotten hot enough for the left plug to start firing full time. About 5 miles down the road I stopped for gas. When I started back up it was rough again for a minute or 2. Since then it has run just fine, a little rough at starting but after the choke comes off - just fine.

I'm thinking I oil fouled the plug ( brand new about 1,000 miles ago), and running it cleared that up. Any other ideas?

Craig

[wa1nca]

50K and many more to go !

My R75/6 smokes on the left side if parked on the side stand(spark plug ok)
Ok if parked on the center side

I. was told they all do that

[srankin]

Boxers of airhead vintage tend to smoke sometimes from oil migrating into the left cylinder while parked on the side stand. Personally I never had enough oil get in to foul a plug but, I could have been lucky.

At least we don't have to prop through the bikes like they did radial engines in airplanes, LOL.

Since I started using ride off stands and haven't used the side stand regularly for years, I haven't had a smoke issue. St.

[cbclemmens]

I did the rings at 47k miles. They might not be completely seated, plus I drained out the 20W50 in October and put in 10W40 for the winter months. I was used to it smoking a little on start-up but not where it affected running.

Craig

[srankin]

For a while, until I started heating my garage/shop in the winter I used 10w 40, on the side stand back then there would be a bit more smoke than with the heavier oil. Funny how memories come back LOL St.