Question about Yamaha YZF-R125 Motorcycles
Check compression first and if over 125psi then look for problem in the caruration system. Check for a clogged or gummed up main jet. Clean good and set to factory specs and should be ready to good. Also install a new spark plug!
Posted on Mar 21, 2014
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Posted on Jan 02, 2017
Seat both screws lightly then go one and one half turns out. If no go, then remove the screws and check for any nicks, score lines or slight depressions around the end of each screw. ANY deformity on the screws dictates that it is time to replace the screws.
Posted on Apr 08, 2009
I tend to agree with DickCanFixIt. Why try to out engineer the engineers who designed the motor? Honda, Yamaha, Harley, BMW, Suzuki, Kawasaki and a hundred other manufacturers do not say or recommend the use of additives. Stick with the standard 10w40 motor oil.
By the way, if you can give DickCanFixIt a top rating, you should. Don't rate my answer, **** did the work here.
Posted on May 02, 2009
if the water pump bearing or seal or bearing has colapsed it is posible for water to find its way into the crankcase. however I must ask did you completely flush the cooling system & change the oil when you changed the head gasket if not the sludge that was left behind would continue to mix with any fresh oil or coolant you may have put in if in fact your problem was a blown head gasket in wich case you need to investigate the cause of the blown gasket have you recently topped up the coolant whilst the motor was hot or worse over heated doing so will definately cause a head gasket to blow was there obvious evidence of the gasket being blown ie blow by marks on the gasket or the head & barrel surfaces if not you will need to further investigate the reason for water finding its way into the oil.Let me know how you get on.Regards Geoff
Posted on Apr 04, 2010
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The Engine and Automatic Transmission (not applicable to manual transmissions) in this vehicles drive train are fully electronically controlled by a computer called the PCM and TCM (Power Train Control Module, Transmission Control Module). When a problem like this or other drive-ability related problems occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM. Also always check fuel pressure for correct spec for your make and engine type.
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