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 60s 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

Need a multimeter try here 


need a new regulator rectifier try here 


need generator alternator try here 



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 multimeter try here 


need a new regulator rectifier try here 


need generator alternator try here 


Saturday, 10 October 2020

Yamaha YBR 125 custom polishing details on wheels

 Yamaha YBR 125 polishing details on wheels

just tape up the rims where you want to remove paint and sand it off going through different grades of sandpaper finish with some polish .


here is sand paper i used 

and polish 


Yamaha YBR 125 custom polishing details on wheels

Yamaha YBR 125 custom polishing details on wheels

Yamaha YBR 125 custom polishing details on wheels

Yamaha YBR 125 custom polishing details on wheels


Yamaha YBR 125 custom polishing details on wheels


Yamaha YBR 125 custom polishing details on wheels

Yamaha YBR 125 custom polishing details on wheels







Thursday, 4 May 2017

Yamaha YBR 125 full service kit - full servicing pack inc spark plug oil and filters etc

I have recently been converted to using these serving kits as you get everything and save on postage

bargain prices too .



Buy Yamaha YBR 125 service kits here on Ebay uk

or try here for price comparison here Amazon UK



Yamaha YBR 125 full service kit - full servicing pack inc spark plug oil and filters etc


THE CONTENTS OF THE KIT WILL INCLUDE.....

SILKOLENE SUPER 4 10W-40 OIL (ENOUGH FOR ONE OIL CHANGE)

1 X HIFLO AIR FILTER

NGK SPARK PLUGS

Saturday, 30 April 2016

Yamaha YBR 125 motorcycle battery maintenance


If in doubt just replace the battery , you can buy them quite cheap
 









First i like to test the battery on the bike .


Test at the battery posts and at the battery Positive and negative wire terminals to ensure you have good voltage at both and to ensure clean terminals .

then test again with engine running .

You should over 12v and them close to 14v at 6000 revs .


Yamaha YBR 125 motorcycle battery maintenance





Battery , make sure its fully charged remove from bike and recharge dont just guess ,
and whilst doing this clean up the battery terminals and the negative and positive wiring terminals .

If you have a voltage meter you can do some basic tests.
When the engine has been off for at least 1-2 hours with ignition key turned off,
100% Charged 12.60 to 12.8v
75% Charged 12.4v
50% Charged 12.1v
25% Charged 11.9v

0% Charged less than 11.8v







I always clean the terminals of a battery on routine Maintenance too , and i always test ground wires for continuity but its best to test earths with a 4 amp test light to ensure adequate current flow .


sorry for photo best i could find but you get the idea test your grounds for minimum 4 amp current flow .

Yamaha YBR 125 motorcycle battery maintenance





I remove battery and clean the outside , baking power is recommended to neutralise the acid and any spilled acid under the battery to stop corrosion .


Yamaha YBR 125 motorcycle battery maintenance

Yamaha YBR 125 motorcycle battery maintenance


Now test battery and top up electrolyte level 


Yamaha YBR 125 motorcycle battery maintenance

remove all the top caps for each cell 

Yamaha YBR 125 motorcycle battery maintenance

and check the level indicator on the front of the battery 
all mine were low so had to top them all up .


Yamaha YBR 125 motorcycle battery maintenance


Yamaha YBR 125 motorcycle battery maintenance

Use only Deionized water - as the level falls the acid becomes more
powerful so you are adding water to dilute the acid to its correct strength 

so do not add acid .




I would now charge the battery to full capacity i am not going to as i do not have time during this post but will later .

After charging or before you can test each individual cell to see if you have a faulty cell 



test between positive and first closest cell 

Yamaha YBR 125 motorcycle battery maintenance

and then between cells 

Yamaha YBR 125 motorcycle battery maintenance

Yamaha YBR 125 motorcycle battery maintenance

Yamaha YBR 125 motorcycle battery maintenance

Yamaha YBR 125 motorcycle battery maintenance

You are looking for around 2v per cell to indicate excellent battery , id ignore my results 
as one its not an excellent battery to i just topped up the water levels and there it was totally
flat but you get the idea .



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Last thing to check is a load test connect the battery back into the bike
and whist turning the bike over so on heavy electrical load test the voltage at the battery 

if you read less than 11v you have duff battery 11v and over indicates a good useable battery .








If in doubt just replace the battery , you can buy them quite cheap 






Yamaha YBR 125 motorcycle battery maintenance

Wednesday, 2 March 2016

Epic 93,000 km ( so far ) YBR 125 journey - Mundo en Moto

YBR 125



Yamaha YBR 125 Around the world trip , 93.000 kms,28 countries visited until now.

Have a look through his blog here you can translate to English , amazing journey on the amazing
Yamaha YBR 125 .



YBR 125

YBR 125

YBR 125

YBR 125