Friday, 25 July 2014

Yamaha YBR 125 Engine rebuild






Yamaha YBR 125 workshop manual

Buy now 



Yamaha YBR 125 parts in the USA 


this is going to be a mess for a while i have pics everywhere ill try to sort asap





thanks for reading the Yamaha Owners blog , if you would like to support us you can by  buying your newYamaha YBR 125 off ebay uk here or buying  parts for your yamaha YBR 125 from ebay uk here or you can buy a a Yamaha YBR 125 haynes manual of Amazon UK here or for YBR accessories at Amazon UK here  , or simply donating here .

You can also visit our sponsors website 125 sportsbikes and spares here .


before starting make sure you have everything you need , bearings , the seals i buy direct from yamaha and usually cost aorund £8 .

make sure all components are good and ready to fit , check cases for damage , check gears for
damage , check con-rod set up , check barrel and piston , hone the barrel ready for fitting
test the cylinder head make sure all is functioning and the valve seal correctly .



Fit gear box 









make sure all gears function correct 

id then warm the engine to expand metal slightly prior to 
fitting the conrod which will have a bearing pressed on already 




crank in and gently tapping into correct seated position 


align timing marks for balance shaft 




fitting cases im told no need for gasket or glue but 
i glue , i dont want to have to strip and rebuild , if your skilled enough 
to see flaws i nthe mating surfaces and know better then go for it me
im chicken shit .


                                         place rag in cases as dropping something in engine now
                                           would be a nightmare .




                                        honing barrel before fitting  , it helps bed rings in


                                     feed timing chain through cylinder barrel

this is tricky now trying to hold chain in position 
its probably the hardest part 



fitting timing chain gear TDC , valves on the rock 


fit tensioner 








                                          timing marks on the flywheel

timing marks on the cam timing chain gear 







after you have fitted with marks in place , turn the engine over to 
ensure everything works fine .




see more Yamaha YBR 125 blog posts 
thanks for reading the Yamaha Owners blog , if you would like to support us you can by  buying your newYamaha YBR 125 off ebay uk here or buying  parts for your yamaha YBR 125 from ebay uk here or you can buy a a Yamaha YBR 125 haynes manual of Amazon UK here or for YBR accessories at Amazon UK here  , or visit chinas online superstore here for very cheap motorcyle products direct from china .

You can also visit our sponsors website 125 sportsbikes and spares here .

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