05 CRF250R Bad rattle/grind noise

[barty5]

approx 80 hours, my mate who has it has had it since about 40, and re's very religious about oil changes and air filters. eg: he's not doing the world's oil supply any favours.


im beginning to think maybe something in the bottom end or maybe piston or something, even with the plug out its not easy to turn over, but then i dont know how hard to turn over its meant to be and the other CRF here currently has no oil in it and im waiting on a oil filter to arrive (ahem) . so i cant comapare it.

should be able to turn over easy with no plug in it something must be bound up. Pull it appart.

[telliman]

faaark, mines done exacly the same thing abt an hour ago,guy at the shops pulling it apart tomorrow, he thinks its the crank!

[cheese]

Hot crank kit!

[honda_power]

faaark, mines done exacly the same thing abt an hour ago,guy at the shops pulling it apart tomorrow, he thinks its the crank!

shit... must be an issue with crfs :S... my 04 never had any problems, did 150 hours on one pistion! yet my 06 that is religiously maintained is allways breaking... must be luck of the draw. its gonna cost ya big if it is the crank.

[4stroke]

did ya check the water pump?
i service my crf religously, my 02 crf did round 300 hours and hardley gave a problem as with my 07 crf is up to 150 odd hours and the only real problem was the water pump, what your describing sounds very like what mine did.

[telliman]

did ya check the water pump?
i service my crf religously, my 02 crf did round 300 hours and hardley gave a problem as with my 07 crf is up to 150 odd hours and the only real problem was the water pump, what your describing sounds very like what mine did.

it had that sort of a smell to it!
it still started fine, still pulled fine, everything under excelleration felt normal, just had this clicky/rattle sound which speed up with the revs!
its only just done 100hrs.

[theblacksmith]

Are all the springs inside casing all good? Anything trapped between clutch and inner g/box casing or maybe other side.Shouldnt be stiff to turn with plug out.Have a look at an exploded diagram of the motor from your nearest honda dealer - you might be able to work out what is making the noise by studying it.Is the noise there when you turn engine by hand or only when motor is running? Was every gear engaging ok? Spose the ultimate is to take it to bits -but its good to investigate all possibles to save unescessary work just in case.Let us know how you's get on.

[B0000M]

its in bits now. bottom end feels perfect. not gearbox related as you can put the bike in gear, pull the clutch in and not move and everything in the gearbox will be stationary. - it still rattles in this situation.

not anything in the right side of crankcase - had everything there apart and checked,

not valves - clearences perfect, valves appear ok also from both sides

not camchain tensioner, working well

not cam bearings. no slop in there.

not cam, it turns nice and smooth

doesnt leave many things eh!

could be piston as it had crap inthe cylinder shortly before the noise came and the piston does have some wear on the skirt.

bore still has factory hone marks right round.

[4stroke]

its not the auto de comp mechanisum? the crfs get quite noisey if the idle to low too

[B0000M]

its not the auto de comp mechanisum? the crfs get quite noisey if the idle to low too

nope its sweet, and its right through the rev range.

[crazyxr250rider]

is the primary drive and clutch ring gear tight and in good condition???

[B0000M]

yea, like ive said, everything inside the right cover is perfect looking and feeling

[B0000M]

aside from the piston having wear marks downb the skirts, i had a thought that if the piston is tilting in the bore, this would make it harder to turn over with or without the plug in, and with the piston out the crank turns easy as, so somewhere in the cylinder there is friction happening, as the cam turns easy buy itself - (when its not trying to push a valve) and the crank turns easy without the bore, so i think im on to something

any thoughts?

[slimjim]

does that model .. really have that amount of problems.. only ask as i've said my eldest is wanting to buy one... humm sorry almost buying one..i run an old IT , yes know its a two smoker.. however i'm not liking this only 180hour rebuild seen..

[B0000M]

i wouldnt let this put you off buying one.

this bike was up to its tank in salt water mud, and it got in through the exaust.

this is the first problem he's had since owning it and its pretty much self induced

my mrs also has a CRF250x, no problems
heaps of my mates have 04s and 05s, no problems