Q: I can’t believe it! I’ve just had my crankshaft rebuilt because of a knackered big end on my Suzuki RMZ 250. A local mechanic/engineer did it, as he said he could, and now I’ve rebuilt the bike it vibrates like a mad thing.
Why could it possibly do this when everything inside the engine is totally new and cost next to a fortune to repair? I just hope I don’t have to take the engine to pieces again and that’s why I thought I’d run it by you first because you seem to have experience on just about everything mechanical in the motorbike world.
Colin Milton Cape Town
A: I’m sorry, but I do have some bad news for you. You WILL have to take the engine to pieces again and take out the crankshaft. If, as you say, everything is new it can only be one thing. The crankshaft hasn’t been correctly aligned after it was rebuilt. It has to be done correctly by an expert using dial gauges or similar to Suzuki’s critical specifications. If not, it will vibrate like a mad thing and eventually the engine self-destruct, possibly causing irreparable damage to the crankcases as well. You’ll then need a complete new engine!
If you have any problems finding the right people for the job send the crankshaft up to us and we can get it done, correctly, for you.
