How To Break In The Engine On Your 97-01 Honda CR250
The Parts You Will Need
- Tool & Parts
- 2-Stroke Oil → https://amzn.to/3WnyXSl
- Coolant
- Fresh Spark Plugs → https://amzn.to/3WnzUdn
- Clean Air Filter → https://amzn.to/3PGirZP
- Fresh Gas
You should take at least an hour to break in your CR250’s engine. This might seem like overkill, but I would rather lock up at five mph in my driveway than 30 mph five miles from my truck.
Before you do anything, refill your oil and coolant. Use a clean filter, spark plug, and freshly mixed gas.
This is also a good opportunity to catch other issues. For example, I spun my bike around, and it suddenly died. Upon further testing, I found a fuel flow issue that was not bad enough to kill my bike while riding but just enough to cut off fuel when bouncing around.
During the break-in, always bring your environment into consideration.
Temperatures During Break-In
I rebuilt my bike in the winter, which is pretty common, and I’m breaking my bike outside, which is also pretty common.
My shop is between 60 and 75 degrees, and outside is 20 degrees. The quick transition from warm to cold will affect everything on a dirt bike. Aluminum, seals, and oil will all change, albeit not much, but more than I want in this situation.
This means I need to minimize the time between the shop and starting up in the cold.
Break-In Surfaces
Take note of what surface you are on.
The ideal surface is a dry gravel road because if you grab too much throttle, your tire will spin enough to avoid a sudden load on the engine. And if you lock up, you will, hopefully, slide to a stop.
The pavement is a good break-in surface because you have more control over your bike but lack the safety net of a loose surface.
The worst surface for a break-in is snow, which is all I have. Break-ins in the snow are always fun because you must keep momentum while trying not to.
But no matter the surface, ensure it’s as flat as possible.
Related: How to replace the shock link bearings on your 1997-2001 Honda CR250.
Engine Break-In
When braking in your engine, you want to avoid any sudden load, over-revving, and lugging.
Kick your bike inside first to ensure it starts and there are no obvious problems.
- Take your bike outside and start it.
- Let your bike idle for a two-count, then give it some throttle.
- Repeat this process until your bike is warmed up.
You can adjust your idle later if necessary, but for now, it’s important not to let your RPMs stay steady.
Get a running start and click into first gear, then ride your dirt bike for about 10 minutes with varying throttle input WITHOUT going over ¼ throttle.
Let your bike rest for 5 minutes while checking gaskets and seals, then repeat the engine break-in process five more times, increasing throttle input by a ¼ turn every second. Run.
The Break-in Should Go
- First Run – 1\4
- Second Run – 1\4
- Third Run – 1\2
- Fourth Run – 1\2
- Fifth Run – 3\4
- Sixth Run – 3\4
This seems like a lot of work, but every Run is a test to see if your dirt bike will lock up.
And I speak from painful experience when I say you do not want to lock up your bike when it is moving faster than idle.
After the engine breaks in, it’s still a good idea to take it easy for the first hour of real ride time.
Keep Your ’97-’01 CR250 Running Right!
- Service Specification
- Clutch Replacement
- Carburetor Service
- Engine Top End
- Engine Bottom End
- Brakes
- Exhaust
- Front Suspension
- Rear Suspension
- Wheels & Tires
- Kickstarter Inspection
- External Shift Linkage
