Tachometer and speedometer bounces....

[SILVERGOAT]

 I have seen here about fuel gauge bounce, but I have a speedometer and tachometer that bounce around. I installed a new speedometer drive and cable, but that's not it. Do these gauges also use the silicone oil to dampen their movement? Does anyone have a proper fix. Thanks again.

[FJmonkey]

Your tach problem is most likely an electrical issue, possibly a ground problem. Your speedo is driven my the cable and would not be affected by electrical issues. I assume you have checked the cable and cable sleeve along with the drive at the hub. Did your bouncing problem with both begin at the same time?

[SILVERGOAT]

 I have only had it for 1500 miles. It has done it since I've owned it.

[Flying Scotsman]

When your moving in 5th gear lift up on the shifter and see if the needles settle down.
My 85 will bounce and drop a few rpm if I dont put some pressure on it.I have not figured it out 100 % yet but I have a  couple of ideas.One is the neutral switch.
If I shift gear and hold the shifter in position I run smooth and the tach wont bounce,if I shift gear and let of the shifter then I drop a few rpm and dont run smooth and the tach will bounce.At night I can see the lights dim as well,they wont dim if I keep pressure on the shifter.
For a whille I had issues starting thats when I found that holding the bike in 1st with some pressure would let her fire no pressure no fire.

[Harvy]

When your moving in 5th gear lift up on the shifter and see if the needles settle down.
My 85 will bounce and drop a few rpm if I dont put some pressure on it.I have not figured it out 100 % yet but I have a  couple of ideas.One is the neutral switch.
If I shift gear and hold the shifter in position I run smooth and the tach wont bounce,if I shift gear and let of the shifter then I drop a few rpm and dont run smooth and the tach will bounce.At night I can see the lights dim as well,they wont dim if I keep pressure on the shifter.
For a whille I had issues starting thats when I found that holding the bike in 1st with some pressure would let her fire no pressure no fire.

From this:  http://www.boats.net/parts/detail/yamaha/Y-1L9-82540-00-00.html

it would appear that switch was used on just about every bike yamaha has made. US$15.51 can't hurt to give it a try.

Harvy

[RichBaker]

When your moving in 5th gear lift up on the shifter and see if the needles settle down.
My 85 will bounce and drop a few rpm if I dont put some pressure on it.I have not figured it out 100 % yet but I have a  couple of ideas.One is the neutral switch.
If I shift gear and hold the shifter in position I run smooth and the tach wont bounce,if I shift gear and let of the shifter then I drop a few rpm and dont run smooth and the tach will bounce.At night I can see the lights dim as well,they wont dim if I keep pressure on the shifter.
For a whille I had issues starting thats when I found that holding the bike in 1st with some pressure would let her fire no pressure no fire.

Check your grounds.... could be using the shifter for a path from engine to frame.... NOT good!

[SlowOldGuy]

Check your grounds.... could be using the shifter for a path from engine to frame.... NOT good!

That is EXACTLY what's happening.  I've seen bad engine ground paths cause visible sparking around the shifter pivot on the frame side.

DavidR.

[SILVERGOAT]

  Thanks a lot for the suggestions. I will check on it A.S.A.P. 
  Leaving tonight for Texas until 9/11. Haven't seen my FZ1 since my last trip 5/1. Needs oil change and a ride. Y'all have a nice holiday weekend.

[Flying Scotsman]

What grounds are we talking about where are they all.Whats on the back side of the neutral switch I have not got the 3rd screw out of mine yet,does the pin in the end of the shift drum ride on the back of the switch ? I dont know where to look other than the starter or alternator/generator.
I cant think of anything electrical thats connected to the shifter linkage.

[RichBaker]

What grounds are we talking about where are they all.Whats on the back side of the neutral switch I have not got the 3rd screw out of mine yet,does the pin in the end of the shift drum ride on the back of the switch ? I dont know where to look other than the starter or alternator/generator.
I cant think of anything electrical thats connected to the shifter linkage.

The ground from engine to frame.....  The shifter is mounted on the shift shaft(engine) and pivots on a bolt in the frame, therefore providing a ground path from engine to frame...... there is a ground that bolts to the back of the engine/trans. I think it goes to the frame, it is probably open..... It WILL cause problems.
See my post detailing voltage drop testing.

[Flying Scotsman]

Thank you I will take a look and see what I find in the a.m..I did look at your voltage drop post.I am just learning my way around the fj and electrics are harder than mechanics for me.If the negative from the battery goes to the motor then something must be going hot + and droping voltage shorting out at the shifter.Is there a ground strap going to the frame from the engine ?.I will go read the voltage drop post again ans see if i get any more out of it.
I could not get the 3rd screw out of the neutral switch should I continue and drill it out or am I wasting my time there.My foot and ankle hurt I need to fix this soon lol.

[Firehawk068]

Could be the coil(s) ground going through the frame-through the shifter to the engine case-then from the engine to the negative on the battery...........
I don't think your neutral switch is the problem. Just turns the indicator light on..
I would check to make sure the connections are solid from the engine case to the battery(maybe remove and clean them)
Check for resistance in the ground cable, and maybe add a ground strap from the frame to the battery.......
couldn't hurt to add one from the frame to the engine either.......
Mostly check all your ground(s) connections......

[junkyardroad]

How about the speedo bounce? Mine was fine for about 2K this summer, then started bouncing after a little sprint after a Vette down the highway.

[FJmonkey]

How about the speedo bounce? Mine was fine for about 2K this summer, then started bouncing after a little sprint after a Vette down the highway.

If you have not already...Check the speedo cable, lube it, check the speedo drive. Is it bouncing at all speeds? Or does it smooth out at certain speeds? Does it make any noise? Mine did as it going out.

[Flying Scotsman]

Speedo jumping would be the cable,either not tight at both ends or dirty.
I didnt find anything today.I found out that I had no front turn signals so I fixed them.I had a bad connector (melted)from the generator to the battery that I cut out and fixed.How many volts should I see when im at 1100 rpm ?Volts check the same everywhere at the frame the engine and at the battery.Starts easy idles good but runs rough and almost seems to run on 3 cylinders if I dont hold the shifter up when in 5th or down when in 1st.