in the last week my 07f has started having a wierd thing go on. If the bike has sat for 4 hours or more the tach wont move when I turn on the bike, no matter what the rpm it stayes at zero. But if I let it sit for 2-10 seconds it will shoot up to the correct rpm then work for the rest of the day or untill it sits for a few hours. it doesnt do it every time it sits though, only about half the time.

Initially I thought "must be bad ground connection" so I tightened the ground cable on the block, both terminals on the batt, and the engine mount bolts. Didn't help a bit. the bike runs perfect, as it always has, but this annoys the poo out of me. Also im worried it will get worse.

Then yesterday It did it again, so I flicked the tach very hard (partly out of frustration) and it fixed it! Then this morning, it farkin got stuck again, so I flicked it (less hard) and it worked the rest of the day no problem. My guess is the needle/spring is getting stuck when it sits and cools down.

I guess my question is, has enyone else experienced this? and if so, has anyone attemped/succeded fixing it?

I just had another post about an 08 tach that has been acting wonky for me.  Its not the same problem, it never reads 0 when the engines running but its got a few sticky spots or something.  It is being replaced right now under warrenty and I havent ridden in days    I have heard a couple other cases of similar problems mentioned.  I wonder if they started making tach's a little crappily when they moved to spain and changed the tach to digital.  A new tach is a pretty expensive peice so I was glad they would fix it for me, even though I would prefer to do it myself. 

Do the 2007s have electronic or mechanical tachs? This is a loosely related problem, but I work as bottom of the totem pole at a high end car shop and we have a '69 Jag E-type. Those things have god awful electronics and I have to give the tach a good "technical tap" to get it to work. I wonder if the gear, or whatever causes the needle to move gets loose and needs a little persuasion to work.

I have a tach from my '93, but it probably won't match the amount of wear on your 07 and look a little faded next to your speedo. Also, your bike would have to have the mechanical tach for it to work, and I can't verify if it works or not, never seen it. BUT if you want it, PM me.  

Quote from: SlimKlim on July 11, 2010, 08:00:30 PM
Do the 2007s have electronic or mechanical tachs? This is a loosely related problem, but I work as bottom of the totem pole at a high end car shop and we have a '69 Jag E-type. Those things have god awful electronics and I have to give the tach a good "technical tap" to get it to work. I wonder if the gear, or whatever causes the needle to move gets loose and needs a little persuasion to work.

I have a tach from my '93, but it probably won't match the amount of wear on your 07 and look a little faded next to your speedo. Also, your bike would have to have the mechanical tach for it to work, and I can't verify if it works or not, never seen it. BUT if you want it, PM me.  

thanks for the offer but the 07 does have an electronic tach.

if this is a common problem that can only be fixed by buying a new tach every few years then ill just invest in an aftermarket one that will last.

Quote from: kman on July 11, 2010, 07:57:55 PM
I just had another post about an 08 tach that has been acting wonky for me.  Its not the same problem, it never reads 0 when the engines running but its got a few sticky spots or something.  It is being replaced right now under warrenty and I havent ridden in days    I have heard a couple other cases of similar problems mentioned.  I wonder if they started making tach's a little crappily when they moved to spain and changed the tach to digital.  A new tach is a pretty expensive peice so I was glad they would fix it for me, even though I would prefer to do it myself. 

mine has been doing that since the day I bought it, it has not gotten any worse. How much is a new tach?

Mine is not going to cost my anything it is under warrenty    I think the part is listed around $180 for the whole tach.  I think that is just what goes inside the bucket and but it might be a new bucket and lense and everything.  Mine didn't start getting wonky until I went to a track day