Wednesday, 3 March 2021

Monday, 1 March 2021

Testing Motorcycle CDI units and systems

Testing motorcycle CDI units 











Learn more about these from this excellent video 





Yamaha YZF R125 electrical wiring diagrams




Hard to find these are ill add more if i find any please dd in comment if you can find any others



Hard to find these are ill add more if i find any please dd in comment if you can find any others



Technicians Guide To Yamaha Motorcycle Electrical Systems

Technicians Guide To Yamaha Motorcycle Electrical Systems


Basic electrical and circuit information ( excellent watch ) well worth watching even if you are above the basics level.


More advanced electrical circuit operation testing and fault finding 



Sunday, 24 January 2021

Yamaha YZF R125 How to test spark plug with multimeter to see if is it is good or bad

 Its a very easy but useful test to make sure your spark plug is ok , you may need to clean the electrode to ensure you get a good reading but all you then have to do is set meter to read ohms and measure from the spark plug cap end to the electrode tip , and then from end to body to make sure no leakage to earth.


Buy R125 NGK spark plugs here i always use them


How to test spark plug with multimeter to see if is it is good or bad

Get set up turn meter to ohms reading on dial and clean the electrode as below 

How to test spark plug with multimeter to see if is it is good or bad

Test between end of spark plug where HT lead cap fits and the tip of electrode the reading is very low only 1.2 ohms 

How to test spark plug with multimeter to see if is it is good or bad

on a dirty part of electrode the reading goes wild and eventually read 188.9 ohms so very bad and to avoid this clean electrode tip 



How to test spark plug with multimeter to see if is it is good or bad


Next test from spark plug cap end to the body to make sure no earth leakage your meter should read OL which is a good reading as it signals no leakage to earth via the body.

How to test spark plug with multimeter to see if is it is good or bad

See video of this process below 


Wednesday, 16 December 2020

Yamaha YZF R125 video repair series on Youtube Playlist

Just added all Yamaha YZF R125 videos to a Playlist on Youtube

Yamaha YZF R125 video repair series on Youtube Playlist


Yamaha YZF R125 repair and maintenance

Yamaha YZF R125 engine strip and rebuild , top end , crankcases , crankshaft , gearbox , piston cylinder head and barrel, maintenance and servicing help and advice.

Click link below to see the videos on the YZF R125 Youtube Playlist 

Yamaha YZF R125 repair and maintenance - YouTube