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CR450 Problems, and noise question
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Posted by: ButtonFly---------------------
I went riding out at the local ORV, and saw my first 450. Sweet bike, very clean, and compact looking. I wonder what teething problems it will have, if any? What do people not like about the bike? I was also wondering if the 450 is louder than the YZ, because it sure seemed like it. I heard a YZ and the CR go out togethor, and the CR just seemed to make more noise, and you could hear it from farther away, with stock exhausts. I like the insert idea for me WR. Any ideas?
Posted by: Boit---------------------
It would be difficult to predict what problems might crop up with the Honda. With the separate lubricating systems for the lower-end and transmission, Honda avoided the pitfalls of the YZ-F's. Hopefully, Honda has also designed a strong clutch and used splines instead of keys at strategic locations. Honda should have learned quite a bit from Yamaha's mistakes. Only time will tell.
Posted by: motormichael---------------------
The aluminum framed CRs seem to transmit engine vibration to the rider. Is this a problem on the new 450 with the 4 stroke motor? Maybe I am just getting old and spoiled.
Posted by: n.i.b---------------------
it is very smooth
Posted by: bashn---------------------
I was so horrified at the CRF450R I bought that I took it back to the dealer and got my money back. The top end made some very loud noises, it blew a lot of blue smoke every time the throttle was chopped, and it stalled abruptly even with the idle set very fast (in nuetral). I've owned 3 YZF's , which is all I have to draw on for experience. I don't have any other CRF's to compare with yet, so this bike could be an anomaly.
Posted by: n.i.b---------------------
ah crap, my bike is behaving like that too bashn. no blue smoke but the head she is a rattlin thats for sure, yep she has stalled on me for no apparent reason about 4 times now.
I saw you post on another board about calling a honda tech line, can you pass that number on to me?
thanks
Posted by: firecracker22---------------------
Wow. You two must be having some odd problem. Ours ran great, started easily, and did not smoke or stall. In fact, it stalls less often than the 426.
It was also very quiet--at idle, it sounds almost like an XR, with a sharper note when you wing the throttle. Almost too quiet. 
NIB and bashn, can you guys post when you find out what the problem was? Were the valves perhaps not adjusted/tightened? That's very odd.
Posted by: bashn---------------------
The dealer I purchased from called the Tech Line, so I don't have it myself. The dealer should be able to provide you with the number. Someone mentioned that an over-oiled air filter could be the smoke culprit, but I've over-oiled my YZF filter once (it pooled oil on the floor over night), and it still didn't smoke.
Posted by: MotoGreg---------------------
I don't think you can call the tech line. I call the Honda tech line (automotive) several times a week but you need your dealer number and other info, it's not for the consumer.
The YZF's have a crankcase breather hose that goes down the left side and vents to the atmosphere, when the bikes are new they get a lot of oil blow-by dripping out of them. Maybe the CRF has the breather vented back into the airbox or something so it burns that oil and that's why you see blue/white oil smoke? As far as over oiling the air filter, that would make black smoke from being too rich, not white/blue oil smoke.
Posted by: nikki---------------------
I'm not sure if this has anything to do with the problems - but there is an overflow hose with a plug in it on the CRF. I think it is an oil overflow and you have to take the plug cap off of the hose and drain it every so often. On the 426 - it just drips out freely (makes a mess all over the motor sometimes) but the 450 has a plug in the end of this hose. So maybe check that?
Posted by: mxguy125---------------------
My 450 is running great, the head and cylinder make much less noise than my 426, there is no smoke and I have yet to stall it. If you guys find out what the problem is please let us know
Posted by: n.i.b---------------------
last night I took it out for some real riding at a mx track. i had a friend out there with his. it was his bikes first ride and you could hear his rattle. he stalled it about 4 times too. mine however is now mostly quiet and did not stall once. previously i had stalled it about 5 times in an emptly lot. i never stalled my 250f so i was concerned. that seems to have gone away now. i thought i may have heard a rattle a couple of time coming from the left side. originaly i had heard that rattle and it sounded like it was coming from the right side of the engine. another friend rode one and confirmed that he heard a rattle from the right side too. hmmm wonder what is going on here?
Posted by: n.i.b---------------------
oh yea firecracker, mine idled quietly too its when you got under power you could hear a rattle. mine also never did stall in neutral.
Posted by: bashn---------------------
It looks like the bike I bought is probably the only one to smoke. I'm glad I left it with the dealer now. As far as the noise you guys hear, I think it's something you just have to get used to. I willing to bet it's normal. When you take 17lbs of metal out of the engine/chassis it seems logical there will be less damping for noise generated by the motor. After I put a skid plate on my DRZ, I get huge variations in noise coming from the engine, depending on the position of my knees/legs! I'm still thinking about buying a CRF.
Posted by: LOOPOUT---------------------
I have rode a few 250F's that have noise on the right side of the engine ... I am thinking its clutch noise or maybe water pump? But both the bikes are going on a year old now with no problems
I am kinda curious tho as my 450F will be in tomorrow or friday ... :think
Posted by: creator8---------------------
my ktm 520exc makes a lot of rattling noises. if you pull the clutch in they change. i don't think its anything to worry about. there's a lot more stuff moving around these motors than the 2 smokes!
Posted by: Dr.billZ---------------------
The one that came in at the local Honda shop would not start until they turned the idle up. Maybe that is the problem with all the stalling, too.
Posted by: JasonJ---------------------
I think the hi comp thumpers have the stalling problems because of the high compression. Getting over TDC is a make or break event, The MX bikes use a lighter flywheel for quicker reving, but the trade off of less inertisha is the stall tendecy. Thats why the WR has a heavier fly wheel I suppose. As far as the noise goes, I know alot of guys said they here a rattle after going from WR to YZ timing, this may be exhaust noise from the aggressive timing. Is the CRF timing gear driven or chain? I know gear driven cams are noisy.
Also alot of 250F guys complained of hard starting and stall outs before the bikes were broken in so it was important to use regular oil and not synthetic in them untill they werer fully broken in.
Posted by: jayrome---------------------
Just picked mine up today, and yes it smokes a little. That is probably due to the bike running to rich. Honda is notorious for running the bikes extremely rich. I haven't heard a rattle and I reved it pretty hard. As far as the stalling goes, the four strokes are much more sensitive when slowing down due to the engine braking. All of the two strokers are going to have to learn to use the clutch a little more when entering the turns. By the way are there any heavier set and taller fellows riding one of these 450's. Just wonderingt about the suspension for those of us over 200lbs.
Posted by: LOOPOUT---------------------
got mine yesterday ... same thing.. a bit of smoke when its reved.. overall its a pretty impressive bike ...
Has any dealer had any oil filters for it in stock .. mine didnt yesterday ...
Posted by: bashn---------------------
I just rode a different one from my local dealer. It smoked a little, which is beginning to sound normal for these bikes, but the first one I rode smoked a lot. This bike was also different in that it did idle well and didn't make any unusual rattling sounds in the top end. There was definately something up with the bike I returned. After riding the bike on pavement I know what people mean when they say this bike needs a throttle limiter! Unintentional wheelies in 1st, 2nd, 3rd, etc. I'm sticking to my 250F, thank you very much.
Bashn
Posted by: snaggleXR4---------------------
Hey,
It's funny, I ride an XR4, which I couldn't stall if I tried. While thinking back when I ride, I always blip the throttle after pulling in the clutch and before downshifting. Just a little habit I picked up on my old XR200 so that I would have some revs (power) left after letting out the clutch. Not that you need to do so for power on the bigger thumpers like the new 450, but, along with turning up the idle speed, it might help alleviate some of the stalling problems.
I'm betting a slightly heavier flywheel mod will become popular in the coming months. Especially as people try to take the 450's to the woods. Damn I hope Honda doesn't shaft us by not making a real woods 450!
Good luck with the new, sweet bikes.
Posted by: penguin---------------------
You guys have to remember this bike has little engine braking and not much flywheel weight, making it prone to stalling if you don't pull the clutch fast enough diving into a turn or trying to run it a gear too high..it is the price you pay for having instant throttle response and 2 stroke type power. And most of my Hondas have always been sensitive to over oiling the air filter.
Posted by: LOOPOUT---------------------
A 1/4 turn on the idle cured my stalling woes at the track yesterday.... only stalled once & that was due to me locking the rear brake up after comming into a sweeper wayyyy to fast.
So far it seems to be a great bike i burned 2 tanks of gas yesterday... only problem i am having is getting the rear suspension dialed in...
Posted by: ochster---------------------
Concerning oil filters, only one shop in our area had them. Changed it at the 20 minute mark and saw nothing unusual for a new motor. The jetting for my local is quite rich, ive ordered some needles and brass and will be going to a quality fuel as soon as they arrive. Ditto on the shock! seems like it will definately need a revalve, have to talk to master Wilkey. Put on some Pro-tapers and will be switching to Michelins/Excels and the rear to 18in. this week.
Posted by: Thumper448---------------------
After looking at the piston on the CRF I can understand why it smokes a little. That thing is unbelievably short. That and the clutch are probably the only things that concern me as far as reliability on the whole bike.
Stace
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