CRF250R top end rebuild Q's - Wrist Twisters
 
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post #1 of 12 Old 03-12-2012, 10:24 AM Thread Starter
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CRF250R top end rebuild Q's

So I found a 2004 CRF250R in my area for sale. Seller claims it needs a new cam and new rocker bearings.

Anyone have any experience in these?

I would like to know what else to expect if those are bad. He claims the bottom end was rebuilt by a local (well known and reputable) shop last summer.

Thanks!

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post #2 of 12 Old 03-12-2012, 10:32 AM
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have him produce proof of said bottom end rebuild. otherwise no.

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post #3 of 12 Old 03-12-2012, 10:40 AM Thread Starter
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disregard thread. seller is crazy. wants way too much money for a bike that needs a rebuild.

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post #4 of 12 Old 03-12-2012, 12:41 PM
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Did he say why it needed a 'new' cam?? I don't think the rocker arms ride on bearings, but it's usually recommended (but not 100% necessary) to replace the rocker arm(s) when you change the cam - so everything wears together.
You'd be looking at $350+ for parts and a couple hundred $$ labor if you have a shop do the work.

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post #5 of 12 Old 03-12-2012, 12:54 PM Thread Starter
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he actually did say it needed a new cam. i can link to the post if you want, but for what he was asking, it's a no go. definitely.

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post #6 of 12 Old 03-12-2012, 12:57 PM Thread Starter
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2005 CRF 250 R

if you get curious. he wanted $1700. for a bike that needs a bunch of work, that's too much (to me). I think around $1200 tops if i have to tear into the motor.

that's just me though.

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post #7 of 12 Old 03-12-2012, 01:13 PM
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crf250's dont have any sort of bearing on the exhaust rocker.

The only reason to have to replace a cam is if it is worn... the only reason for it to of been worn is from oil starvation.. which is just plain bad for everything.

If it needed a top end rebuild... your looking at piston, pin, rings, head and valves.... ~ 1000 in parts or so. w/o a cylinder.


Having a bottom replaced / rebuilt on a crf250 just sounds like it was abused and not maintainted.... you rarely see people that have to rebuild a bottom on these bikes.

I have a 04 crf250x... with a 06 250R cam, pink wired (r ignition curve), opened up airbox rejetted etc.... probably 800ish hours on it still on the complete original top end... these bikes (race 4 stroke dirbike motors in general) need alot of care as far as oil changes.... playing with less than a quart of oil at 11-12k rpms leads to oil being broken down REALLY quick and oil consumption just due by nature of design. Its not uncommon for a crf250 to go through a full dipstick of oil in a day (its really only a couple of oz of oil)... but you gotta watch it. They are great bikes i love mine, but you cant just ride em and leave maintenance for a rainy day, like you can the 919, or older less high strung dirbikes like the xr250 / 400.

Id steer clear.

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post #8 of 12 Old 03-12-2012, 01:36 PM Thread Starter
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nd4spdbh - Thanks for the heads up! I pretty much came to the same conclusion, but definitely happy to hear from someone who actually owns one!

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post #9 of 12 Old 03-12-2012, 01:37 PM
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I agree, I have a crf450r and I did the top end as preventative maintanence but everything still looked brand new with over 200 hours of hard riding. Plus a professional shop wouldn't rebuild a bottom end and put the old top end parts back on. Something is totally wrong and not worth buying

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post #10 of 12 Old 03-12-2012, 02:17 PM
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Quote:
Originally Posted by ganktor View Post
nd4spdbh - Thanks for the heads up! I pretty much came to the same conclusion, but definitely happy to hear from someone who actually owns one!
Any other questions feel free to ask! sometimes i wish i had a 450x.... but honestly my 250x/r (i call it that cus its pretty much now a crf250r motor (minus the head) with a wide ratio x tranny) gets me around just fine.

Quote:
Originally Posted by Januik12 View Post
I agree, I have a crf450r and I did the top end as preventative maintanence but everything still looked brand new with over 200 hours of hard riding. Plus a professional shop wouldn't rebuild a bottom end and put the old top end parts back on. Something is totally wrong and not worth buying
ya that just sounds real fishy.

Lol i got past the point of eh ill do "preventative maintenance" by redoing the top end, im now on the mind set of.... lets see how long she lasts. My buddies shop manager cant understand how the thing still has great compression etc.

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post #11 of 12 Old 03-12-2012, 03:22 PM
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Yea I heard horror stories about the top ends going and I had a Yamaha 450 quad that blew to pieces because I didn't know how often you had to adjust the valves (they had just come out) but one thing you gotta remember is that these are Hondas good luck blowing a motor

All the Honda bikes and quads I've ever owned have been indestructible...and I beat my 450r for 4 years before I cracked the top end and there was barely carbon build up on the piston. Did run real nice afterwords though, just have to keep those valves in tolerance and keep oil in it.

Edit: cracked as in took it apart not physically cracked haha

1984 Honda V4 Interceptor 750 (sold)
2003 Honda 919
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post #12 of 12 Old 03-12-2012, 03:31 PM
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like stated before.... alot of the reasons people were having problems with the race 4 stokes when they came out was simply due to the fact they were riding them like a 2 stroke.... IE wound out banging the revlimiter 24/7.... its a 4 stroke with torque down low... use it and shift.

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