05 CRF250R Bad rattle/grind noise

**B0000M** · 9th September 2008, 09:31

my mate's CRF250R had recently got a real bad noise, it sounds similar to the noise that a bike makes when you push the kick starter down while its running, only its not that noise because if you push the starter down then it makes that noise too.

doesnt get better or worse through trying anything we have done so far

have had the right side crankcase cover off, checked all the kickstater stuff we can see

water pump looks ok too, everything in that side thats visable looks and feels ok to me.

ive seen bits of comments about the decompression thing rattling, but havnt seen any solutions. but i have no idea if this is even possibly the problem.

it sounds to me like the sound is coming from in the right crankcase cover, but its quite difficult to pinpoint with all the different sounds coming out of the thing.

id assume its not the valves because 1 minute it didnt rattle, then the next it did, it didnt get gradually worse.

anyone got any suggestions of where to look next?

**cheese** · 9th September 2008, 10:12

Try the aftermarket CR250 replacement. LOL

is it the cam chain you think? Have you had the head off adn looked at the valves?

**B0000M** · 9th September 2008, 10:59

definately coming from the right hand side. i would doubt its the chain or valves due to the way it suddenly started rather than gradually getting louder.

sound like something metal grinding on something else metal.. not a nice sound

**cheese** · 9th September 2008, 11:56

Didn;t he get it stcuk in a bog recently? Maybe its something like what happened to that guys KTM on here?

**B0000M** · 9th September 2008, 13:30

Originally Posted by cheese

Didn;t he get it stcuk in a bog recently? Maybe its something like what happened to that guys KTM on here?

yea, its been in a massive bog, but i fail to see how that has affected it, there was a bit of muddy shit in there- bad enough to flush it thru a couple of times with clean oil, but not bad enough to cause a meltdown i wouldnt think. engine and engine oil seem fine - have drained both lots of oil.

the 2 stroke option may be on the cars judgeing by how much he seems to like the CR250s to ride

**xwhatsit** · 9th September 2008, 13:41

Originally Posted by B0000M

it sounds to me like the sound is coming from in the right crankcase cover, but its quite difficult to pinpoint with all the different sounds coming out of the thing.

You might know this trick already, but it's really quite effective -- get a big screwdriver, put your ear up to the handle and touch the pointy end against the engine where you want to check for noises. Like a stethoscope!

Doesn't sound fun. Haven't revved the tits off it and bent a valve or something?

**B0000M** · 9th September 2008, 13:49

done that too, on the "tappet cover" sounds good, on the cylinder just sounds like the exaust, and on the right crank case cover sounds like what the problem sounds like, but i cant localise it any more than that.

the other unfortunate thing is it has a Ti4 on it and its fucken noisy, therefore limiting testing times at night

**barty5** · 9th September 2008, 15:46

what was the oil filter like (metal bits in it???)
Also would check for oil pressure dont know bout the hodas but yamaha has a point you can check oil/p worst case run it and crack a oil line make sure oil flowing.

**4stroke** · 9th September 2008, 20:37

lol, my 450 did a simular thing......... the water pump impeller fell off the shaft, its alloy and the threads onto the shaft and the threads shit them selves. umdo the water pump cover and see if the impellor is loose.

**honda_power** · 9th September 2008, 22:42

crankshaft / and or crankshaft bearings, possibly the valves. exact same thing happed to my 2006 crf250r. Whatever you do, DONT RUN THE BIKE! I was out in the middle of nowhere, and rode it home thinking is was the valves, mechanic said i was lucky it didnt blow. cost me $2500 [labour inc], and i had a full rebuild kit that came wuth the bike new, so god knows how much it would have been without. ill try and find receipt and tell ya exacly what was wrong. sounds like the same problem to me, as the bike rattled, then stopped, then did it again etc.

**B0000M** · 9th September 2008, 22:58

Originally Posted by honda_power

crankshaft / and or crankshaft bearings, possibly the valves. exact same thing happed to my 2006 crf250r. Whatever you do, DONT RUN THE BIKE! I was out in the middle of nowhere, and rode it home thinking is was the valves, mechanic said i was lucky it didnt blow. cost me $2500 [labour inc], and i had a full rebuild kit that came wuth the bike new, so god knows how much it would have been without. ill try and find receipt and tell ya exacly what was wrong. sounds like the same problem to me, as the bike rattled, then stopped, then did it again etc.

its more of a grinding sound than a bottom or big end bearing sound, the rattle / grind sound is much faster than the enigne is doing revoloutions - eg several rattles/grinds per revoloution.

had the top end apart tonight for inspection, valve clearences etc are all well within spec. so all is well up there. decomps is also ok

**telliman** · 10th September 2008, 09:46

out of interest(a bit off topic) how many hours has it done?

**B0000M** · 10th September 2008, 14:10

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.

**slimjim** · 10th September 2008, 14:20

pull down... doesn't matter anymore trying to find.. as its only gona get fixed by .. pulling apart.. update too please as my eldest boy is looking at one too.. secondhand however he's been told that its had a rebuild...not bought it yet... as been used at woodville next week..