Trading 125 for 250f

ReturnofJorddo
Edited Date/Time 1/24/2016 6:32pm
Someone wants to trade a 2010 KX250f for my 2003 KX125. Im pretty interested, the bike looks to be in good shape, but he tells me it needs the valves adjusted. He says you have to bump start it when its cold, but it starts fine when warm. Im just worried that itll need new valves and springs or the compression is low and it will need a new top end and/or a cylinder. Thoughts on trading?

Part of me wants to and says its worth a shot, but another part of me says steer far away from this one.
|
Pirate421
Profile picture for user Pirate421
Posts
1826
Joined
7/26/2015
Location
USA
Pirate421 1/23/2016 10:57am
1/23/2016 10:57am
Not a chance
murph783
Profile picture for user murph783
Posts
1355
Joined
3/2/2011
Location
USA
murph783 1/23/2016 12:21pm
1/23/2016 12:21pm
In my experience most times someone says the "valves need to be adjusted" it's more than that. If you're pretty mechanically experienced and can diagnose and fix a 4 stroke engine yourself maybe, but other than that I'd steer clear.
ReturnofJorddo 1/23/2016 12:30pm
1/23/2016 12:30pm
murph783 wrote:
In my experience most times someone says the "valves need to be adjusted" it's more than that. If you're pretty mechanically experienced and can diagnose and...
In my experience most times someone says the "valves need to be adjusted" it's more than that. If you're pretty mechanically experienced and can diagnose and fix a 4 stroke engine yourself maybe, but other than that I'd steer clear.
I usually do all the work myself, but Im not all too familiar with the top ends on a four stroke. Thankfully Ive got a friend who has quite a bit of experience working on them that will help me and walk me through the process. He also had a 2011 KX250f that he used for a KX125Af he did and still has the engine, I wonder if anything from that would fit on this bike? Would the cylinder and top end fit from an 11 to a 10? Just if I had to replace it and hed sell it to me cheap.

Also, wouldnt it not being properly jetted for the winter effect how hard it is to start as well?
mb
Profile picture for user mb
Posts
775
Joined
7/22/2014
Location
Columbia, SC, USA
mb 1/23/2016 1:13pm
1/23/2016 1:13pm
Gives me a bad feeling...

The Shop

See All »
MxKing809
Profile picture for user MxKing809
Posts
6374
Joined
10/13/2013
Location
Big Sand Whoops, MI, USA
Fantasy
1117th
MxKing809 1/23/2016 1:58pm
1/23/2016 1:58pm Edited Date/Time 1/23/2016 2:07pm
Assume you're into new valves (because if the shims are off the coating is likely worn and wearing the valve and moving it up), piston/rings/gaskets, and a quickie lap job on the valve seat by a local shop.... should be 500-700 bucks or so depending on what you buy.

If it's still worth it than go for it. If it turns out to less than that you're in the green!

Edit:

For $599 Fastheads will rebuild you head completely with Del West Ti valves . Throw a new piston in her and you should be good to go barring a crank issue!
harescrambled 1/23/2016 3:59pm
1/23/2016 3:59pm Edited Date/Time 1/23/2016 4:02pm
ReturnofJorddo wrote:
Someone wants to trade a 2010 KX250f for my 2003 KX125. Im pretty interested, the bike looks to be in good shape, but he tells me...
Someone wants to trade a 2010 KX250f for my 2003 KX125. Im pretty interested, the bike looks to be in good shape, but he tells me it needs the valves adjusted. He says you have to bump start it when its cold, but it starts fine when warm. Im just worried that itll need new valves and springs or the compression is low and it will need a new top end and/or a cylinder. Thoughts on trading?

Part of me wants to and says its worth a shot, but another part of me says steer far away from this one.
The valves on that bike have been neglected to the point that they're so tight the engine needs extra help to start. The valves/seats are hammered and will need to be replaced/recut. Also, you can expect to buy a piston, main bearings, and get the connecting rod replaced. If you don't do ask there above, it's a grenade with the pin pulled.

I'd buy it for a grand tops and keep the bike you have. Or not buy it at all and keep riding the KX

Edit: forgot to mention... You'll be replacing the cam chain also.
Jmcd1988
Profile picture for user Jmcd1988
Posts
690
Joined
8/8/2015
Location
Brandon, FL, USA
Jmcd1988 1/23/2016 8:47pm
1/23/2016 8:47pm
I did this with my cr125 for a crf250... I have one thing to say...


RUN!!!!!


I had to do a complete engine rebuild. When all said and done I basically trade my clean cr125 and $1200 cash for this bike.
Dubby McDubs 1/24/2016 6:32pm
1/24/2016 6:32pm
Hang onto that 03 KX, mate. Never let it go!

Post a reply to: Trading 125 for 250f