Advice on Venturing into my G80 Engine
Posted: Fri Oct 19, 2018 12:10 pm
Having put about 70 miles on my new to the road '48 G80 and in spite of excellent performance I am going to have to 'bite the bullet' with regard to the unsettling (possibly half engine speed frequency) mechanical, pulsing, rumbling I am experiencing (most noticeably) at tick-over which sounds something like the noise that Dr Who's tardis makes?!
I understand that whatever I reveal I will probably have to go on into the engine further but I was wondering if it might be something like timing gears, camshaft lobe wear, bushes or even, having read recent posts, a broken oil pump shaft. Sorting my worn out CP clutch hub certainly took one of the parts of the noise away but it still doesn't sound good and can even be felt through the bars on tick-over. My main thought is rumbling/damaged mains, the bike stood for probably 50 years but there would have been oil present and also the big end feels and sounds fine to me. No swarf is revealed from the sump plug but I don't know if that always means a lot particularly if it is knackered bearing races. Can the gearbox mainshaft generate noises like this in neutral and in drive?
Any thoughts on where to start first would be appreciated, it would be great if I stumbled upon something relatively exterior rather than having to go the whole hog, plus the bike appears to be pretty low mileage from the condition of all sprockets etc.
Thanks
Iron Head
I understand that whatever I reveal I will probably have to go on into the engine further but I was wondering if it might be something like timing gears, camshaft lobe wear, bushes or even, having read recent posts, a broken oil pump shaft. Sorting my worn out CP clutch hub certainly took one of the parts of the noise away but it still doesn't sound good and can even be felt through the bars on tick-over. My main thought is rumbling/damaged mains, the bike stood for probably 50 years but there would have been oil present and also the big end feels and sounds fine to me. No swarf is revealed from the sump plug but I don't know if that always means a lot particularly if it is knackered bearing races. Can the gearbox mainshaft generate noises like this in neutral and in drive?
Any thoughts on where to start first would be appreciated, it would be great if I stumbled upon something relatively exterior rather than having to go the whole hog, plus the bike appears to be pretty low mileage from the condition of all sprockets etc.
Thanks
Iron Head