Monday, 1 March 2021

Testing motorcycle CDI units and systems

Testing motorcycle CDI units 
















Learn more about these from this excellent video 





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 YBR 125 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 YBR 125 NGK spark plugs on Ebay UK here


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 YBR 125 Youtube playlist repair video series

 



Just added all the video on YBR 125 to a Youtube playlist 


Yamaha YBR 125 Youtube playlist repair video series


Yamaha YBR 125 repair and  maintenance

Yamaha YBR125 YBR 125 strip down and restoration series of videos , engine strip down and rebuild Top end Cylinder barrel piston crankcases and crankshaft gearbox etc  , maintenance and servicing , fault finding repair and fixing help and advice on these excellent Japanese bikes

Part of my Engine strip and rebuild series for the Yamaha YBR 125  if you Have a Yamaha XT 125 R then this engine is the same as yours.

Click link below to see the videos in the Yamaha YBR 125 playlist

 

Yamaha YBR 125 repair and maintenance - YouTube

Thursday, 5 November 2020

Yamaha YBR 125 regulator rectifier testing



First ill show a quick test on diodes inside you regulator rectifier .

You are just checking current flow through the regulators diodes in forward and reverse bias.

Cagiva Mito 125 regulator and charging system testing .










I usually face the regulator this way and test as below 


Connect + side of meter to bottom left hand pin/ connector and negative or common to
upper left hand pin you should get a reading of 0.6 or just under here i get 0.512 so happy with that.



swap the leads around and you should get 0L on the meter meaning current is
flowing one way and not the other and diode inside regulator is fine.


Now do the same but on the far right hand side pins/ connectors 
test both ways again you should get 0.6 or close to it one way and 
OL the other again testing the diode.


Now test between the R/H lower pin and centre you should get a reading one way and not the other my reading is 1.172 and its a good rectifier regulator and show diode working 




Now test between the L/H lower pin and upper centre pin you should get a reading one way and not the other my reading is 1.181 close to above reading  and its a known good rectifier regulator and shows diode working 





need a  YBR 125 regulator rectifier try on Ebay UK here 


need YBR 125 generator alternator try on Ebay UK here