hi everyone ive got a 2010 yam wr125r

problem was riding home and gradually revs got lower then conked out on me hasnt fired up since it turns over good spark and plenty of fuel as plug is wet tried bumping her off no luck any ideas many thanks lee,

leave the plug out overnight and try again tomorrow

tried it no luck it sounds like it wants to tho a real headscratcher this one

OK has the bike got a carburettor? If it has then try draining the float bowl there may be water in there

no mate its fuel injected

hmmm

is there a problem with the exhaust valve?

if there is a spark and plug is wet with fuel then i dont know myself, all i can think of is the burnt fuel isnt getting exhausted

is compression ok?

have you sprayed the HT lead and coil with WD40?

Try a new plug even if you do have a spark with the one fitted!

compresion is good to check the exhaust valve do i just take off the very top lid off the motor only 6 m8 bolts there?i will have a look tommorow as im waiting for a new plug to be delivered thanks

do the easy stuff first before you start delving, after all you did say compression was good.

WD40 and new plug = easy

Yeh sorry it's a bad idea taking your bike to bits before the easy stuff!

Try looking at the induction system also, change the plug! Is the spark nice and bright or is it dull but still sparking?

Ken

tried new plug wd40 and induction chaps all clear can i check the exhaust valves without tearing it apart thanks again lee

Honestly like mate I have never worked on your bike before but when me and my dad done my old Honda xlr we took the head off and checked it all but that is a right chore and I wouldn't advise doing that until someone who knows this model bike can chirp up and give you some pointers.

Is your spark a bright healthy looking one or is it bright and dull at different times?

Is your bike even trying to start?

Sounds like a puzzle to me pal

Ken

looking at the valves they doesnt seem to be any clearance at all when turning over is that right ??

ignore the that last comment there fine got motor tdc after compression stroke and valve clearance fine got it to run for about two seconds 3 or four times now should i check the injection part air filter ect again also my battery is on charge now??????

how is the air on it?
i have had issues starting bikes because of the air filter. but having said that those were close to dead b4 i started.

it sounds like not enough air or sparking at the wrong time to me.. But i have never worked on a bike that new to be honest with you. if it hasnt got a carb i havent got a clue.

got it to start wont rev or idle properly make a small clunk noise near the water pump then cuts out anyideas chaps???

ohh and the negative cable off the battery wasnt grounded to the frame the washer had snapped now replaced

thanks lee