Jump to content

Grinding sound when cranking hot, bad battery?


Recommended Posts

6 hours ago, JZH said:

US import?  Strange for someone to remove the remote reserve switch.  Do you have a low fuel light in the tachometer?

 

P7220010.thumb.JPG.6247e589af9d77811816fdea30d1c832.JPG

 

Ciao,

 

JZH

Its not the import. R/R failure is common so previous owner instaled voltmeter.

Link to comment
Share on other sites

That starter motor design is very robust.  Settle down and cross that bridge if needed.

 

The only starter motors I've had to replace are the crappy 2 brush versions that the VF1000F/R came with.  And I replaced with used VFR (4 brush) starters.

  • Like 1
Link to comment
Share on other sites

1 hour ago, Captain 80s said:

That starter motor design is very robust.  Settle down and cross that bridge if needed.

 

The only starter motors I've had to replace are the crappy 2 brush versions that the VF1000F/R came with.  And I replaced with used VFR (4 brush) starters.

Good to know that, thanks.

 

Also, one thing that I hope isn't related to this problem. The famous pink connector which is near starter solenoid is slightly melted on one side, but not that much. Dunno if that can be the cause of this problem, cuz its not giving the power to the starter.

 

I guess somehow starter motor gets heat soaked, but I never heard that is problem on any motorcycle...

Link to comment
Share on other sites

It's the abundant amount of brush dust that increases the resistance of the starter motor and gets worse with heat.

 

You can buy replacement wire lead / plugs for the relay and you simply must replace it at this point.  Solder or solder-seal a new one in.  I've been doing this a lot lately and is a common issue on these bikes.

  • Like 1
Link to comment
Share on other sites

20 minutes ago, Captain 80s said:

It's the abundant amount of brush dust that increases the resistance of the starter motor and gets worse with heat.

 

You can buy replacement wire lead / plugs for the relay and you simply must replace it at this point.  Solder or solder-seal a new one in.  I've been doing this a lot lately and is a common issue on these bikes.

 

I will probably sort that plug the last. Problem is that I don't have electric or soldering knowledge and also I don't have these small OEM parts in my country so I need to order it from abroad on which I need to pay shipping + tax +customs... 

 

Should I sandpaper the commutator or is it enough to clean it with contact cleaner, rug and tootbrush? Someone say you can sandpaper it, someone you shouldn't.

Link to comment
Share on other sites

Sand the brushes a little.

 

I know this sounds weird, but get yourself an old school red rubber eraser for the armature.  Anybody that raced slot cars knows what I'm talking about.

 

Look into solder seal wire connectors and a good heat gun if you're solder skills are lacking.  You can source the plug kits off ebay.

  • Like 3
Link to comment
Share on other sites

I have some 30W soldering iron that I bought for the electronic, don't know if thats enough. 

 

I will post the pictures or write after I open the starter and see what is inside :)

Link to comment
Share on other sites

I got it out :) Tomorrow I will countinue. 

 

I guess these lines are aligment marks. Is this properly aligned?
nakY78M.jpg

 

They are not 100% lined but I guess this is fine?

Link to comment
Share on other sites

That little bit off is fine. 

 

No need to grease the spline, just lube up the o-ring with a touch of oil when reinstalling.

  • Like 1
Link to comment
Share on other sites

1 hour ago, Captain 80s said:

That little bit off is fine. 

 

No need to grease the spline, just lube up the o-ring with a touch of oil when reinstalling.

 

Ok here are some insights :)
One washer is chipped, don't know how much is that important but just to notice.

Inside, some black dust, not that much but there is. 

 

l9ZY6tQ.jpg

--

 

Now these brushes (movable parts) are 10mm in height and 5mm wide. I measured only the part that is sticking out, not the inside. I read in manual that minimum is 6,5mm but don't know what to measure.

wPFKYsO.jpg

 

-

 

Now this is a commutator, I see that the copper part is black, can I sandpaper this with a fine sandpaper? 

A7tge9w.jpg
 

 


Also you said something about red rubber eraser, so that is for that fatter aluminium part right?

Link to comment
Share on other sites

As long as the brushes have to get pushed back a fair amount when re-installing, they are likely fine.

 

The Red Eraser is to clean up where the brushes run.  At least that's what I use, non-destructive and polishes it up.  Finish with some electronics cleaner.

 

Yeah, that doesn't look too bad in there.  Still worth doing.  There will be a fair amount that gets washed out around the magnets in the body too.

 

Wait...  is that just a 2 brush starter?  Or are the other two on the body still.

  • Like 1
Link to comment
Share on other sites

Too bad there isnt full presoldered repair kit, so I can just put it in and thats it. If I order this part above, don't know if I need to order brushes separately, and the terminal also...

 

I suspect that brushes are worn. I will try to clean but I don't have high hopes.

 

If that doesn't help, the fix will probably wait another season.

 

Link to comment
Share on other sites

Tested it without fairings, let it turn the fans, drive it, let it idle...  It looks like it cranks a bit faster, so far not draging when its hot but will check when I get the fairing on. Maybe with fairings there is more heat down below. Its a bit more noisy when starting hot but so far no draging. 

 

 

Link to comment
Share on other sites

Yeah at least I learned something new to do and if I need to do it again, it will be faster and easier to do. 

 

I will ride and see.  If the problem persists, I will go with new brushes, then solenoid. I would change the cables too over time, but can't find new battery/starter cables for this bike.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...

Important Information

By using this site, you agree to our Privacy Policy.