Many old carbied bike engines will stall if you try and ride them unless the engine has had a minute to warm up from a competely cold start.
Basically, if you let the engine idle for several minutes when it's cold to warm up, it takes much longer to warm up than if you ride it very gently for a few minutes. The longer the engine is cold for, the more wear and tear occurs. When the oil is cold, it becomes thick and may not have sufficient pressure to cover all of the engine.
The same rules do not apply for 2 strokes.
CBR250 engines, by nature, are designed to be revved very hard. They don't like cruising along at 50kmh in 6th gear.
On the right hand rear fairing there is a hole where you can see the water level. It's meant to have antifreeze in it so it should be bright green.
So what if you are cruising especially on long straight roads say at 50km/h on the second gear? Based on past experience, was told that the throttle should be opened and closed. It should be held open constantly. Not sure why but am curious to know the reason.
Cool. Should it be completely topped up?
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