If all is OK with clutch freeplay and rear shock, it could be the oil that looses friction and causes sudden slip at high power, suggest an easy check by making a change to an oil claiming JASO MA2 (MA2 has higher friction than MA1) . When only JASO MA is on the can one can't tell if it would meet MA2, so avoid that in this case.
CBR250R as my 1st bike
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our clutches are 'wet' ie, immersed in oil..
oil condition will effect friction to some extent
regardless,, whether or not that underlies your slipping
events isnt certain here, but at 8krpm engine is close to
its high hp/torque range, so...
members have pointed out the most likely first options
so firstly adjust your activating mechanism, the clutch lever
itself both ends plus general checking of cable etc [who knows]..
second would be replacing the old [you mentioned time since changing]
oil, as advised by richard above, or some similarly appropriate oil..
[given appropriate oil, it can only cost in $ anyway]
ive never had a clutch problem in 4 previous road hondas
so doubt this nicely designed honda engine would fail here
so early.. adjustment is free, oil is necessary..
if they dont correct it best use a honda mechanic..
I believe it is clutch slippage, the lever its self is very loose.
What do I do to correct?
Is it because of my driving habits?
Do you slip the clutch a lot? At high rpm? Do you ride around with your hand resting on the clutch with a little pressure on it? These things will eventually damage the clutch. Just like in a car...
Make sure your hand is nowhere near the clutch when riding would be a good thing to do in your case as a check that its not your habit to actually be putting pressure on the clutch. If you put some pressure on the lever you may be reducing the pressure on the clutch plates: then the clutch will slip. This doesn't need a lot of pressure to happen, especially if you have no freeplay. Even a slight bump in the raod could cause you to put a wee bit more pressure on the lever = slip of clutch "randomly".
Your OP says you are still on the original oil...if the oil is very old then it will not be able to do its job properly. How many km have you done on this original oil? It should have been changed out at 1000km/600miles.
What do you mean by the "lever is very loose". Is it loose and then gets harder to pull after about 10mm? The first "loose" 10mm is the freeplay. I ask as the CBR has a very light clutch, and so you think it is "loose", when it might not be and so you have no freeplay in actuality.
1. Check your riding habits. No hand on the lever when not changing.
2. Check the free play properly (RTFM)
3. Change the oil
3. If the above don't solve it, then go to your dealer.
Eleven hours in a tin can?
God, there's got to be another way!