Yamaha R1 Forum: YZF-R1 Forums banner

1 - 6 of 6 Posts

220 Posts
Discussion Starter #1 (Edited)
Hi fellow riders.
Recently I was facing some issues with my bike, even with a full charged new battery the bike was having starting issues.
If the bike was sitting for a week I could see it was facing starting issues, after firing the dashboard was turned off for a second and the start was difficult like the starter was drawing to much power or something.
I did some tests, I put 2 good batteries parallel and I put a Multimeter to the battery.
Fired up a lot of times and I noticed some times the Volt Drain was 1.5v to 2v(from 12.8v to 11v eg) and the bike was starting immediately and some other times the Volts were draining to much, way down to 8v and the bike was struggling to start.
Did some search in here and the Starter was the first thing to blame.
My bike has 61.000Kil, so I figure out the maintenance and inspection of the starter was inevitable.
Now pulling out the starter is a pain in the ass job to do. After checking some Videos I figured there are 2 ways to do it.
1. First by Removing the thermostat
2. Second by removing the injectors.

The first way is the easiest because you don't have to remove many parts, but it will give you a hard time to reach the starter motor, especially the 2nd screw took me about an hour.
The second way is much more pain in the ass as you have to remove the injectors, but after the kit is gone it'll be very easy to pull out/in the Starter Motor.

In my case I went with the first option to remove the thermostat because it had a small leaκ from the thermostat gasket(o-ring), so I had to repair this too.
The first thing to do is to remove the Gas Tank and to disconnect the pipes.
Second remove the air filter box.
Third disconnect the pipes and remove the thermostat.
After that you will have to disconnect some other pipes and after you raise the heat protective cover you will see the Starter Motor.






Ok, now that the starter is out first thing to do is to mark the sides with a marker because you don't want to assemble it the wrong way and not spinning clock wise, witch eventually make the bike not start and you'll have to go all the prοsidure again from the start. (Epic Fail).


Here is what i find.




Well, the brushes seemed ok but definitely the hole thing needs cleaning.


Used some soft sand paper on the brushes to clean them, never use a sand paper on the armature
surface, just clean it with a soft cloth.
Το be continued....

220 Posts
Discussion Starter #2 (Edited)
I did a very exhaustive cleaning just to be sure there where no oil residues left.






Ok, now for the re assemble you will have to put the brushes facing the right way as I show in the picture below...Very important step.

After that, you will have to place the armature first, it's a little tricky because you must pull the brushes back to fit in.
After that place the magnet cover, be sure to much the markers we put before the disassembly(++,--).
With one hand you must push down the armature and with the other place the magnet cover, be carefull because the magnets are strong and may pull off the armature from the brushes, that's why you have to push the alternator with the one hand down.

After that a polish will take place...


Well after the maintenance did some test with a 12v battery, I swear the sound of the starter motor wasn't so loud and for sure it seems to sniping with more power. After a reasearch on the net some guys says that the starter must drain at least 1.5v 2.0v from the battery. So now mine seems ok.
Did a video here

Next step is to find and ampere meter to test it, before replace it on the bike.
To be continued.....

220 Posts
Discussion Starter #5
Ok guys, the AD/DC current tool has arrived and make the test after the Starter Motor maintenance.
I find some Videos on youtube and some guys say when the starter is off the bike it should draw 50-60amps, and when it's one the engine approximately 200-250Amps DC.
I think I'm ok.
Only wish I had the AC/DC tool earlier, to measure the Starter before maintenance, but I'm pretty sure it spins with much more power now.
1 - 6 of 6 Posts