Wednesday, 3 November 2021

Yamaha YBR 125 engine rebuild parts

These are the parts i use to rebuild my Yamaha YBR 125 engines with


Firstly you need good gasket sets i always use thes NE brand ones never failed me yet





I use either SKF or Koyo bearings 




                                Buy these on Ebay UK here 



Athena Seals New oil seals need to be fitted on every rebuild                                                                           
Cagiva Mito Engine recommended rebuild parts





Ive had very good success with these piston from firefox but if you can find genuine on an auction then but them
 first.








For barrels i always try to rebore and oversize piston.




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