Boffin Posted August 22, 2007 Share Posted August 22, 2007 The tacho on my R1150RT has started behaving oddly. On the first start of the day all is well but after sitting in the bike shed at work for 9 hours it does not register until the bike is revved close to the redline. Once indicating all is well again. Park it for the night, next morning it works until I come to go home again. The bike shed is covered on three sides, the weather is temperate and the bike stays dry and well aired. Any ideas? Andy Link to comment
Joe Frickin' Friday Posted August 22, 2007 Share Posted August 22, 2007 The tacho on my R1150RT has started behaving oddly. On the first start of the day all is well but after sitting in the bike shed at work for 9 hours it does not register until the bike is revved close to the redline. Once indicating all is well again. Park it for the night, next morning it works until I come to go home again. The bike shed is covered on three sides, the weather is temperate and the bike stays dry and well aired. Any ideas? Andy Follow the wires, find the connector. Sounds like a loose/corroded connection that occasionally needs the vibrations and/or high voltage associated with redline to restore (temporarily, at least) good connectivity. Link to comment
arbee Posted August 23, 2007 Share Posted August 23, 2007 Most people who have had erroneous tacho movements say it is a prelude to a Hall Effect Switch failure. Link to comment
Joe Frickin' Friday Posted August 23, 2007 Share Posted August 23, 2007 Most people who have had erroneous tacho movements say it is a prelude to a Hall Effect Switch failure. I've seen spastic tach behavior after a dead HES leaves the engine inoperative, but if I understand Andy, the engine is still running fine. Link to comment
Boffin Posted August 23, 2007 Author Share Posted August 23, 2007 Most people who have had erroneous tacho movements say it is a prelude to a Hall Effect Switch failure. I've seen spastic tach behavior after a dead HES leaves the engine inoperative, but if I understand Andy, the engine is still running fine. The engine is running just dandy and the tach either works or has no indication. The HES failure mode has the tach dancing around apparently at random. What bugs me about this issue is that in the morning, after standing outside under a cover in the damp English summer weather there is never a problem. I know that in 3 hours time when I get on the bike at the end of my working day, when the bike has been sat in warm, dry weather that the tacho will not work without being prodded. Andy Link to comment
PapaJ Posted August 23, 2007 Share Posted August 23, 2007 Andy, I would agree with Joe, It's a connection. Find the connection, clean it and I would put some di-electric grease on it. Your symptoms say it's a moisture related item, probably the moisture is "helping" to make the connection, then when it dries it can't until you get enough voltage. Link to comment
StuGotz Posted August 23, 2007 Share Posted August 23, 2007 Andy, Store your bike outdoors all the time.. Your RT obviously likes the cool damp environment. Link to comment
ESokoloff Posted August 24, 2007 Share Posted August 24, 2007 Could the needle be sticking on the stop or the shaft hanging up on its bushing? Is the bike exposed to the sun in the 3 sided shed? Anyway to rig up a temporary fan in the shed to see if cooling off the motor before it heats up the tach makes a difference? Any way to temporarily connect a volt meter to determine if your fault is electrical or mechanical? Link to comment
David Sharpe Posted September 26, 2007 Share Posted September 26, 2007 I just started experiencing the exact same symptoms on my '04 1150RT. Coincidentally it is also a blue 1150. What was your solution? Link to comment
Boffin Posted September 26, 2007 Author Share Posted September 26, 2007 I'm still monitoring the situation..... The bike is due to be given a brake service soon, I was going to chase this one down whilst I had it in bits for that. Andy Link to comment
HandyAndy Posted September 26, 2007 Share Posted September 26, 2007 I know that in 3 hours time when I get on the bike at the end of my working day, when the bike has been sat in warm, dry weather that the tacho will not work without being prodded. Andy You should have lots of spare time to track it down with only a 3 hour work day! It does sound like a bad connection somewhere, most likely at one of the plugs as stated earlier. Good luck in tracking it down. Andy. Link to comment
bmwmick Posted September 27, 2007 Share Posted September 27, 2007 Andy, I'm leaning towards Eric's idea....sticky needle at the stop. The Oilhead tach is one I've never had apart but maybe you could use a hi intensity light and a magnifying glass to inspect the needle and the stop? I don't think a dirty connection would be so reliably intermittent. Mick Link to comment
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