Join Date: Apr 2016
Thanked 165 Times in 135 Posts
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Not good. In automotive terms the engine is an 'interference fit' engine which means the pistons are able to hit the valves if the camshafts and crankshafts are out of time. When you break the crank bolt in an effort to force it to turn over then it's a pretty good sign that there was/is a mechanical blockage preventing the engine from turning over. Any time there is a mechanical blockage or hydraulic blockage - it's not a good thing. I'm sure the mechanic will love you because;
1) You tried to save money at his expense
2) You then promptly broke the crankshaft bolt (among other things)
In all truth, unless a person has a strong background in the automotive trade (or other equivalent) I would seriously consider just biting the bullet and taking it to the dealer before you muck things up. Even people that have 'successfully' adjusted their valve clearance often have the exhaust camshafts retarded. They think it's good but it's not. If memory serves there's even a How-To on this site where the pictures clearly show that one of the camshafts is out of of time. I would not be surprised if many of the bikes out there are like this due to the owner saving money.
Don't get me wrong, it's not like it can't be self-serviced but I used to own an automotive shop, have personally worked on thousands of cars, have probably done a thousand timing belts and I know, right off the bat, that any high-performance engine will have tight piston to valve clearance and this means that the pistons will likely hit the valves if mis-timed. Even knowing nothing about bikes, in that case I would know that the engine is built so close to maximum possible performance that it's very definitely going to be an 'interference fit' engine. There is no other way to extract the maximum performance from a naturally aspirated engine then to have high compression and little valve clearance.
Unless a fella has that understanding and experience going in, it's probably best not to go there at all. My guess? All new exhaust valves and that's assuming a fella can even get the bolt out of the crank. If I had a shop, and someone brought me that mess to clean up, got to say, I would probably send the customer down the road with a sympathetic (and genuine) sadness.
06 CBR 600 RR