1 A strange problem with idle speed and warm up Wed Aug 14, 2024 4:09 pm
letsgetpractical
active member
I have a 1985 BMW KRT100 and have had this problem for over a year now. it has to do with warm up and idle speed.
When the engine is cold it will start up no problem using the fuel enrichment lever. It appears to idle Ok for a brief period, then it conks out and will not start again. If I leave it alone for about a minute, it will start back up again and appear normal. It may do this once or twice, but after the engine begins to warm up fully, the problem is gone. After that, even if the bike sits for an hour or so, as long as the motor is still warm, it will start up and act normal. I have changed the coolant temperature sensor but no difference. Also have checked Z tube and rubber parts for air leaks, but found none.
The other problem is with idle. After warm up, when I pull up to a stop light the engine will stall normally. Not always though! I turned idle speed up and it didnt help. I have looked for leaks using a propane torch unlit around rubber connectors but found no increase in idle speed. Any ideas on these problems? When warmed up the bike runs ok, I dont notice any major issues other than what was mentioned already.
When the engine is cold it will start up no problem using the fuel enrichment lever. It appears to idle Ok for a brief period, then it conks out and will not start again. If I leave it alone for about a minute, it will start back up again and appear normal. It may do this once or twice, but after the engine begins to warm up fully, the problem is gone. After that, even if the bike sits for an hour or so, as long as the motor is still warm, it will start up and act normal. I have changed the coolant temperature sensor but no difference. Also have checked Z tube and rubber parts for air leaks, but found none.
The other problem is with idle. After warm up, when I pull up to a stop light the engine will stall normally. Not always though! I turned idle speed up and it didnt help. I have looked for leaks using a propane torch unlit around rubber connectors but found no increase in idle speed. Any ideas on these problems? When warmed up the bike runs ok, I dont notice any major issues other than what was mentioned already.
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I own a 1985 KRT 100 Bmw