Hi all I have just acquired a CBR 600 F2 which is a non runner. I have been told that it has possibly spat a valve. When this happened I've been told the bike was loosing power so by keeping the revs up he managed to get it almost home before there was a bang and a cloud of blue smoke. The first thing i need to establish is whether the engine still ok.The engine turns over but i don't want to risk any further damage. What is best - take the head off and have a look or is there something else i can try and do to diagnose the problem? Any suggestions would be welcomed
If you've already been told it's a valve problem, you need to get the head off and gave look, but chances are, as said above, cheapest option is a replacement engine.
Look for a web site called CBR6ers, there's a few guys on there who will be able to help and some of the breakers request the site.......
Thanks for the responses guys. Have been a bit busy and had vey little time to get to the bike but back on it now. Update. Have now removed the valve cover and exhaust manifold. There is oil on both exhaust valve shafts on cylinder No. 4. I assume this might mean the valve seals are leaking as there is no oil present in the chambers part where the valves sit? Or if it's coming from the engine (piston ring leaking) could it burn off everywhere except from the valves? If the above is just the valves seals leaking I do not see why that would stop the bike from running properly. It was hardly running and the last owner had to keep it at high revs to get it home before and bang and a cloud of smoke. It still ran though so it is not seized. Will be removing the cams and cylinder head tomorrow so will update then.
Mmmmm, hate to say it, but. Think the oil is more likely to be coming from the crank case...... Hole in piston or rings ..... Good luck.
Cylinder head off and all will be revealed, not sure if you can get the head off with engine in situ. on these but the guys on the 600 forum will know.
Ok, So after realising I don't have the right tools to pressure test or gauges to measure valve clearances and eager to crack we proceeded to remove the cams yesterday. When removing the the cam chain tensioner we noticed a strong smell of petrol! Removed the dip stick to check there as well. Not only was there a very strong of petrol but the level was very high and thinned. Ok, so I assume that this is looking like a piston or piston ring. Either way, next chance I get we'll be removing the head to see what's happened. All the cams looked good, no scoring anywhere or any foreign objects found.
