Question about 2005 Honda CRF 250 R

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04 crf 250r.... the head has a chattering noise when running

The bike ran fine until my right intake valve clearance zeroed out on me, it was not adjustable anymore so i put a new valve in it. I put the head back on once the new valve was in, lined eveything up, made sure the valve clearances were right and made sure the timing marks were lined up correctly. When i tried starting it i noticed that it kicked over harder then usual almost like it was not timed right. When it started up it made a noticably loud chattering noise coming from the head. The bike idled and reved fine except for the chatter. Long story short I triple, triple checked everything the timing, valve clearances, put a new cam chain guide in, i even took out the hot cam and put the stock cam back in. The cam chain is newer it only has a handful of hours on it. I cant shake that chatter noise.....maybe the cam retainer rings in the holders?? Help

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  • holtnj Jun 23, 2009

    spring is new with the valve , thrust washers are there, the bearing could be bad. I have never changed the bearing before that could be the weak link. Thanks!!

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Any chance the valve spring has collapsed? Cam shaft thrust washers missing? Cam shaft bearing gone bad?
04 crf 250r.... the head has a chattering noise wh - abe5193.gif b3c3550.gif Please rate this solution. Thanks!

Posted on Jun 22, 2009

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Set your cam chain tension

Posted on Aug 12, 2009

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You did not mention that you had a valve job done. When replacing a worn out valve you also have to re-cut the old valve seat (multi-angle valve job) to match the new valve. Since you only replaced one valve it sounds like a patch job that proper rebuild would have fixed.

Posted on Feb 17, 2010

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1 Answer

2002 Honda CRF 450 R valve clearance
Hi, Chelsea for this scenario you will need your service, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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04 crf 450 starts hard most times we have to push start it but after that it starts fairly easy.
crf honda's run titanium valves which wear out very quickly if valve clearances not checked very regularly. what happens is the valve wears on its sealing face and clearances close up and then valve rides and looses compression,much like a leaking tap. bike will make more compression and valves will try to seal when warm. i probably rebuild one of these bikes a week with this problem. get it to your dealer and have clearances done. you can get stainless steel valve conversion kits which are much cheaper than honda titanium valves.

Aug 31, 2010 | 2005 Honda CRF 450 R

1 Answer

Back fire wont start by kick but will if i jump start it cfr 250 r
This is normally caused by a tight intake valve or pluged pilot jet. Check your valve clearance. Usually the right intake valve will close up first and then the left. If you have to go more than 3 shim sizes smaller to get the right gap your head will need to be rebuilt by a machinist. Google crfheads to find a good rebuilder.

Jul 28, 2010 | 2005 Honda CRF 250 R

2 Answers

My 05 crf 250r will only start when pull started
it's your intake valves honda uses a titanium intake valves while it saves .999 pounds it IS there down fall. The valves start to recesse into the head, which we know will cause the clearance to get smaller. A.P.E offers a great fix, its a rebuilt head port and polished to stage 2 specs. with stainless steal valves springs and new keepers. While your there it'll give you a chance to see how things are doing on the top end of your motor, pull your cylinder and check your rod the gasket kit comes with a base gasket too so take your and build it right. this is also a great to replace your rings and hone the cylinder or better yet put a bore job on the to do list.
Fix it right, Ride it fast!
Mark
C.C. Motorsports

Mar 28, 2010 | 2003 kawasaki KX 125

1 Answer

My bike is making a weird noise in the engine.
it could be a lack of oil getting to the valves and it might just be how hard the bike has been riden i have a 09 kx 250f and it makes the same noise but its done that ever scince ive ownd it did u buy it new or used?

Feb 25, 2010 | 2005 Honda CRF 250 R

2 Answers

Hello
No you shouldn't have to get them adjusted that ofter by no means......have to changed spark plugs lately......run any carb cleaner through you motor such as seafoam (found at autozone or advanced)? anyway thats what i would do before i adjusted the valves again

Feb 16, 2010 | 2005 Honda CRF 450 R

2 Answers

My 04 rmz250 is overheating. It started smoking 3 different times when i took it out the other day. Id let it cool down for a few, continue riding and about 20 minutes later it would start smoking again....
Several things here. Do an oil change, 10w40 motor oil. Run premium gas and install a new NGK spark plug one heat range colder than stock. It sounds like you have an air leak causing a lean fuel mix. Check the carb mount bolts and the intake manifold bolts for tightness. Also set the valve clearances with a cold engine > .002 intake and .003 exhaust. Check for any cylinder head leaks. This would show up as oil on the cooling fins at the base of the cylinder head. Tighten the head bolts if needed.

Apr 28, 2009 | 2004 Suzuki RM-Z 250

3 Answers

04 crf450r hard starting
May be a decompression problem. What gear do you use when you pull it?

Apr 25, 2009 | 2005 Honda CRF 450 R

2 Answers

New rebuild chatters
adjust your valves your oil pickup tube needs to be adjusted you need feeler guages to adjust the valves down properly
make sure lifters and oil pick up tubes are not clogged

feeler guage is---> thin pieces of metal cut to different sizes to hold under valve adjusters till the play and chatter gone
check by book what the feeler size needed for adjustment

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