Posts
2206
Joined
4/1/2008
Location
US
quadzrulebro
10/11/2017 5:16am
10/11/2017 5:16am
Edited Date/Time
10/12/2017 7:21am
Our racing season is coming to a close, and I'll have plenty of time this winter to rebuild my ride. I've never owned a bike this long prior to this one, so rebuilding it has never been an issue before.
I have a bone stock 2013 KX450 with nearly 140 hours on it. I race MX in the +40 class. The bike only gets used on motocross race weekends. I have changed the oil every 10 hours. The valves have been inspected and adjusted as necessary. I replaced the piston at 80 hours, but that was just a precautionary measure. The bike runs perfectly, but I don't want to push my luck. What should I replace over the winter, and what company/services should I utilize to do the work?
OR...
Am I better off just selling it and forking out 9 grand for a new one? Problem is, as a 6'4" motocross rider, I really like the layout of the chassis on this bike. Plus, believe it or not, Factory Connection has my air forks working great for me.
I have a bone stock 2013 KX450 with nearly 140 hours on it. I race MX in the +40 class. The bike only gets used on motocross race weekends. I have changed the oil every 10 hours. The valves have been inspected and adjusted as necessary. I replaced the piston at 80 hours, but that was just a precautionary measure. The bike runs perfectly, but I don't want to push my luck. What should I replace over the winter, and what company/services should I utilize to do the work?
OR...
Am I better off just selling it and forking out 9 grand for a new one? Problem is, as a 6'4" motocross rider, I really like the layout of the chassis on this bike. Plus, believe it or not, Factory Connection has my air forks working great for me.
Last winter I sent my 2015 yz250f motor to Motor Medic Racing and was thoroughly impressed with the end product. He replaced the rod and piston, cleaned up the head, removed the counter balance, and super polished the transmission. None of this reduced the reliability. The transmission treatment was probably the most impressive treatment. It reduced the engine braking to a point where it is now nearly non existent. Coupled with removing the counter balance the bike now revs much faster. It also allows you to use more of the low end power because the internal drag of the engine was drastically reduced.
John with Motor Medic Racing does sweet work, he will take care of you.
http://motormedicracing.com/
The Shop
John even had to redo valve seats as one seat had a tiny chip. The turnaround was about four weeks, but I lost a week each way with shipping the motor from Illinois.
I was referred from a friend so I don't know if I got a friends and family discount, but all in it was $1,700.00. That included all parts, and shipping the motor back to me. I feel like it was a good deal, especially considering the fun factor.
Oh, and I've been prowling this site since before you were a noob. Rubber side down.
I like those yellow YZ's. A buddy of mine races one that looks pretty similar to yours. $1,700 isn't too bad for an engine rebuild and all you got. I miss the engine braking on my 4 stroke the most. That was the hardest adjustment on the 2 stroke for me.
If not, am I crazy to think that 140hours on the bottom end is a lot? Being that you have time off the bike, id get that whole thing rebuilt. But that's me...
Pit Row
Post a reply to: Engine rebuild advice