Xj600 cams, the final stretch, help needed.

[Gazdaman]

Ok, the heads have been swapped. The good engine is back in the frame, with the good head on it, new head gasket, carbs are on. Whoever designed those carbs and the way they go on needs to be shot several times.

Now it's time for the cams to go in. There are 2 marks for the timing, T and C.

I believe T is TDC, but do I need it set at T or C to get the timing right? And even when I have the pistons in the right position, where do I need the cams to be? What kind of marking am I looking for?

Hopefully CraigT19 can shed a little light here, as he's done it before.

Then it's just the trivial jobs of bolting everything else back on. And hopefully it'll start, and run, and will get me to, round, and back from snetterton.

Gaz

[Kickstart]

Hi

Any chance of some pics?

Normally you set one cylinder (normally No 1) to TDC, and then the cams are fitted. Yamahas in the past have had a line on the sprocket to indicate the position at tdc.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Gazdaman]

Ok, had a good hard look. No line on the sprocket, although there is an indentation above one of the bolts holes in the sprocket.

Other than that, I can find no other indications of where the cams need to be when the piston is set to TDC.

Any help here is much appreciated and needed, if I can't get this sorted soon, I won't be going to snetterton, and that'll be £90 down the shitter, and I may well cry.

Craig mentioned in another thread that..

[Kickstart]

Hi

Mmmm. Not sure.

On the FZR600 the marks are punch marks on the end of the cams (near side). There is a kind of flange at the end that is marked, with a matching mark on the camshaft cap at that end.

Once everything is timed up then fit the tensioner, double check the timing and turn it over carefully by hand to ensure it is not binding.

Remember that the caps have to go back in the same place they came from, and they are matched to a particular head so you cannot use the ones from your old head on the new engine.

Sorry I do not have a manual for the original XJ600.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Gazdaman]

Ok, this morning went well. I found a punch mark, on the cam, adjacent to the cam cap for #2, which also had a small marker on it. Note pic.

https://www.gaz-racing.co.uk/bike/cams/DSCI0104%20(Small).JPG

The mark on the cam cap is now hidden behind that little punch mark, but they line up fine.

So I put the cams in...

https://www.gaz-racing.co.uk/bike/cams/DSCI0105%20(Small).JPG

Bit of oil underneath each cam cap, and a bit of copper grease where it should be.

https://www.gaz-racing.co.uk/bike/cams/DSCI0106%20(Small).JPG

Timing mark where it should be.

When I turn it over by hand it doesn't hit anything. This seems right to me. Just waiting for my dad to check it over before I do any more work. But I'm slightly more hopefull today than yesterday.

Thanks Keith!

Gaz