Just a valve adjustment?

TJMX947
Posts
746
Joined
3/6/2017
Location
Indian Trail, NC US
9/20/2018 6:43am
I just costed the parts on RM for a 2017 YZ250F for OEM valves, piston, gaskets, and timing chain = $591. Can you believe an OEM Yamaha piston kit is $88!!!!???!!!!
1
TJMX947
Posts
746
Joined
3/6/2017
Location
Indian Trail, NC US
9/20/2018 7:09am
So this thread got my mind churning and I found this:

http://fastheads.com/wp-content/uploads/2018/03/FH-Head-Service-Menu.pdf

They advertise $699 for a complete head rebuild with OEM grade Ti valves on CRFs. Still would need a piston, timing chain, and gaskets - probably $200 on top with you doing the final assembly. Looks like just getting the inspection and seats cut is around $175...I haven't done much research on the topic.
1
Lightning78
Posts
6306
Joined
12/12/2007
Location
Huntington Beach, CA US
9/20/2018 8:59am
Back in the day I trade an 02 CR250 with some electrical issue and just a bill of sale for a CLEAN super low hour 04 CRF250 that had head/valve issues and I had a spare 2007 CRF250 head laying around.....swapped it out and was good to go. That 04 was a bitchin bike.
mattyhamz2
Posts
10849
Joined
7/6/2015
Location
So Cal, CA US
Fantasy
760th
9/20/2018 9:18am
Back in the day I trade an 02 CR250 with some electrical issue and just a bill of sale for a CLEAN super low hour 04...
Back in the day I trade an 02 CR250 with some electrical issue and just a bill of sale for a CLEAN super low hour 04 CRF250 that had head/valve issues and I had a spare 2007 CRF250 head laying around.....swapped it out and was good to go. That 04 was a bitchin bike.
I rode a buddy's 04back in 08ish and that was a pretty decent motor! Obviously they had the valve issues, but it was a good motor. Wasn't quite the motor that my 05 kx250f had, but it wasn't far behind.

On another note, everyone shits on the 04-05 kxf's, but I'll tell you I've never had an issue with mine. 200+ hours on one piston and one clutch replacement. Finally put a new crank and everything in it earlier this year. Only issue we ever had was the transmission. Other than that the bike was/is solid! I believe maintenance was a big factor for everyone on those bikes.

The Shop

9/20/2018 9:38am
If you want a crf250 for cheap it would be better to pick up a 10-13. It's a better bike overall and really reliable.
2
Bruce372
Posts
6342
Joined
4/1/2008
Location
US
9/20/2018 9:44am
I dont have a job at the moment. A two stroke would be my choice but I just dont have the money for it atm
mattyhamz2 wrote:
What is your budget?
$2000 max. I still have to get new gear.
You are gonna spend close 2000 rebuilding an older 250f
DoctorJD
Posts
2920
Joined
4/1/2008
Location
Somewhere in..., GA US
9/20/2018 10:06am Edited Date/Time 9/20/2018 11:25am
Donovan759 wrote:
I own one and have been through this. Definitely the valves and definitely going to cost you big time in about 20-30 hours of riding. You...
I own one and have been through this. Definitely the valves and definitely going to cost you big time in about 20-30 hours of riding. You can maybe get by shimming your valves about 3 times before you have to do a top end rebuild. Each time you shim them, you will regulate your issues for about 10 hours of riding. Start saving your money if you're trying to buy that bike. You're looking at at least 1-1.5k to have someone rebuild the top end.. Other than that, Its a very solid bike. IMO, I wouldn't buy it unless you're paying like 1500 and its solid. Its just not worth the headache you're about to experience.
BroFoSho wrote:
Having owned an 04, 05, and 06 Donovan is right. Once the valves start moving they aren't going to stop and shimming will only be a...
Having owned an 04, 05, and 06 Donovan is right. Once the valves start moving they aren't going to stop and shimming will only be a bandaid. You'll need new valves, and have seats cut and machined in. You'll also want to replace the piston, cam chain, and other valvetrain wearing parts while you're in there to freshen the whole thing up.

However it WILL NOT cost 1-1.5k. maybe if you take everything to the dealer it would? But you can do the work yourself and have a machine shop clean up the head and be good to for under $600.
BroFo is right, once you shim the valves the first time, you can go ahead and start counting down 10-12 hours before you're going to need new valves and seats. You can actually buy a new OEM head with SS valves installed from Big Bore Thumpers for $575. I did the math on my 04', and for an extra $100 I could do the Big Bore Thumpers head kit. Everything is installed ready to bolt on (except the intake boot and exhaust flange).

If you can do the work yourself, that's pretty much all you're going to have invested.
1
davis224
Posts
6214
Joined
8/15/2006
Location
Cornland, IL US
Fantasy
182nd
9/20/2018 3:22pm
colintrax wrote:
Those old hondas ate valves. Just avoid it. Best 4 stroke of that era is the KX. 2 strokes are more better though
MxKing809 wrote:
You’re kidding right? Honda got the valve seat issue fixed by 07 - you can’t be advocating anyone touch a 05-07 KXF/RMZ!?!?
My 07 ate intake valves for lunch. But yea, I saw way more KXF's drop valves in those couple years. Yamahas were bulletproof.

Post a reply to: Just a valve adjustment?

The Latest