Tuesday 7 April 2015

Yamaha YZF R125 Test motorcycle relays



Yamaha YZF R125 clutch common problems rebuild strip inspection test and measure   










Testing a starter relay is quite easy.

basic equipment needed is 12v battery with 2 x wire i use crocodile clips .

you can also use a small test bulb as well .





if you need to buy a new relay then try here on Ebay UK


Yamaha YZF R125  How to test motorcycle relays

or you can invest in good and safer tool like the 12v powerprobe and 

snap of test light probe I bought and are excellent .


Yamaha YZF R125  How to test motorcycle relays

I always have a fully charged 12cv battery with crocodiles knocking

 about it saves loads of hassle 


Yamaha YZF R125  How to test motorcycle relays

The relay , the small terminals are what connect to your starter

 button and carry a lot less current .the larger terminals

 are connected direct from battery to the starter

 motor so need larger wires to carry the

 massive starting currents .


Yamaha YZF R125  How to test motorcycle relays

Yamaha YZF R125  How to test motorcycle relays


I am using the power probe here as its safer but you can just as

 easily connect the 12v negative to one side and tap

 the positive on the other side you should hear a

 click as you touch the positive and remove it .


Yamaha YZF R125  How to test motorcycle relays

You can go a step further and add a test light to it and confirm

 current it going through the secondary circuit .




to test with a lamp you need to connect one end on test light circuit

 to battery positive and the to one of the relays larger terminals 

and then use another cable from second larger terminal to negative of

 battery ill do basic circuit diagrams at bottom of page .

Yamaha YZF R125  How to test motorcycle relays

Yamaha YZF R125  How to test motorcycle relays


Now when you put power to the smaller terminals it should click but

 also the light should flash on and off as you tap power .



OK not the best , never have been very good with Windows Paint 



Yamaha YZF R125  How to test motorcycle relays






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