grover1949
New member
About 4 years ago, I bought a 1983 R65. When hot, I would pull in the clutch and the engine would want to idle at 2500-3000 rpm. If stopped, I could put it in gear and start to let the clutch out; once the rpm dropped under 2,000, the engine would settle down to an idle of 750-800 rpm.
I posted those symptoms here and a few folks said I had a bad Hall Effect sensor. I removed and dismantled the bean can, cleaned and lubed the flyweights, and re-assembled the can. When re-installed, the idle issue was mostly gone, and when blipping the throttle, I could feel the famous BMW torque. The idle issue returned about 150 miles later.
So, in November of 2013, I bought a new Alpha 1 igniton kit (bean can, ignition module, Dyna Coil, wires, and plugs). Time flies; earlier this week I actually got the
Alpha installed. The spark timing is spot on (The first tab is centered in the hole at 800 rpm and the second is centered at 3,000 rpm).
I took it out for a run and it is much smoother than before. However... it was a 90 degree day and after 8-10 miles at 55-60 mph, I came to a soplight, closed the throttle, and pulled in the clutch; the engine continued to idle at 3,000 rpm! Again, if I slowed the engine by starting to let the clutch out, once the rpm dropped below 1,800 to 2,000, the engine dropped to a smooth 750-800 rpm.
Any and all ideas as to why the engine want to idle fast when hot, even with a totally new ignition system, will be greatly appreciated.
Thanks in advance,
Larry
I posted those symptoms here and a few folks said I had a bad Hall Effect sensor. I removed and dismantled the bean can, cleaned and lubed the flyweights, and re-assembled the can. When re-installed, the idle issue was mostly gone, and when blipping the throttle, I could feel the famous BMW torque. The idle issue returned about 150 miles later.
So, in November of 2013, I bought a new Alpha 1 igniton kit (bean can, ignition module, Dyna Coil, wires, and plugs). Time flies; earlier this week I actually got the
Alpha installed. The spark timing is spot on (The first tab is centered in the hole at 800 rpm and the second is centered at 3,000 rpm).
I took it out for a run and it is much smoother than before. However... it was a 90 degree day and after 8-10 miles at 55-60 mph, I came to a soplight, closed the throttle, and pulled in the clutch; the engine continued to idle at 3,000 rpm! Again, if I slowed the engine by starting to let the clutch out, once the rpm dropped below 1,800 to 2,000, the engine dropped to a smooth 750-800 rpm.
Any and all ideas as to why the engine want to idle fast when hot, even with a totally new ignition system, will be greatly appreciated.
Thanks in advance,
Larry