CBR250RR smoking when near redline

**matoc** · 9th February 2009, 23:08

Evening ladies.

I've got a bit of a problem with the old CBR. Apparently it's blowing smoke when I have it near redline, especially when blipping down. Since I can't see the exhaust while riding I have no idea when it is happening, but I'm sure hmurphy will be around shortly to fill in the details.

As far as how the bike feels, I'm not noticing anything. It's not losing power or skipping around. So basically what do you reckon it could be? I'm having it taken in for its 6,000km service when I have the cash, but till then I'd like any ideas of what it could be.

PS: The track day I attended last Thursday was the first time it was noticed as I'm normally behind hmurphy and his r6 on 'takas rides. So for all I know it has been smoking for a while. If this is the case, is it common? A 19,000rpm is rather high after all.

Thanks in advance!

**hmurphy** · 9th February 2009, 23:16

When the bike is high in revs and is being blipped down a gear, a dark black/purple smoke is spewed out the back and this happens when a gear is being revved out and then upshifted too. I followed the bike up the takas today and it smelled like oil the whole way up.

It is nearly at the 60,000km mark on the odometer and I wouldn't bet against it not ever having a proper service in its life (besides oil changes and oil filters). Basically... what is about to blow up in this old beast? She still runs great despite its smoking problem.

Solution: buy an R6

**matoc** · 9th February 2009, 23:24

Originally Posted by hmurphy

Solution: buy an R6

Wanna swap?

**hmurphy** · 9th February 2009, 23:37

..........

Originally Posted by hmurphy

Solution: buy an R6

**R6_kid:Me** · 9th February 2009, 23:44

sounds like it wants new rings

**hmurphy** · 9th February 2009, 23:51

Cool thanks man. Any other advise guys? I need to know what tools I am gonna need to get ready as matoc has a tendancy to have his bike stripped in my garage every couple of weeks.

**driftn** · 10th February 2009, 07:36

Hold it at the red line it should clear out

**imdying** · 10th February 2009, 08:08

Not worth touching it... either rape it till it dies, or, given that you can't see it when you're riding, it seems likely that the muppet you sell it on to probably won't pick it up either

And even if he does, you'll have his money

**hmmmnz** · 10th February 2009, 08:10

i would do the clearances ect, plugs and all the rest of the service type stuff, and see if that makes a difference,
failing that off with its head

and then check the rings

**Squiggles** · 10th February 2009, 08:20

How much oils left in it?

**hmurphy** · 10th February 2009, 09:23

It doesn't appear to be burning through heaps of oil either. Even after a track day it didn't use excessive amounts at all.

**mark247** · 10th February 2009, 09:34

Originally Posted by hmurphy

It doesn't appear to be burning through heaps of oil either. Even after a track day it didn't use excessive amounts at all.

Doesnt need to burn much oil to make it smoke. Sounds like rings if its doing it when ya reving it out. If it's happening when you are gearing down into a corner it could be valve guides/seals.