I have a 250 gv. It runs well but sounds rattly and clicky and whiny, 2006 10,000km

Sounds like you need to adjust the valves.

Noisy engine. Excessive valve chatter

1. Valve clearance too large.

2. Weakened or broken valve springs.

3. Worn down camshaft.

Noise appears to come from piston

1. Piston or cylinder worn down.

2. Weakened or broken valve springs.

3. Worn down piston pin or piston pin bore.

4. Piston rings or ring groove worn.

Noise seems to come from timing chain

1. Stretched chain.

2. Worn sprockets.

3. Tension adjuster not working.

Noise seems to come from clutch

1. Worn splines of countershaft or hub.

2. Worn teeth of cluth plates.

3. Distorted clutch plates, driven and drive.

Noise seems to come from crankshaft

1. Worn or broken bearings.

2. Big-end bearings worn and broken.

3. Thrust clearance too large.

Adjust.

Replace.

Replace.

Replace.

Replace.

Replace.

Replace.

Replace.

Replace.

Repair or replace.

Replace.

Replace.

Replace.

Replace.

Replace.

Replace.