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[Doctor Gollum]

They are numbered 1 through 4 according to the cam position 

1 and 4 are the exhaust ones, and 2 and 3 are the inlet ones

[Jan Suhr]

On the left hand cam use marking 3 the red one you have marked. On right hand cam use mark 4 the red one not the green.  It would be good for someone else to confirm too as I am going from memory- last time I changed a belt was two years ago!!!

I agree, the picture shows the correct position with the red arrows since this was before I took it apart. The tricky bit that fooled me is that the wheels 3 & 4 are the same. On wheel 3 there are the numbers 3 4 stamped at the left mark, and that's why I positioned it at the green arrow since the numbers are there. Whey they did so is a bit unlogical in my mind. But maybe the 4 had to be where it is since there is a big hole where it supposed to be.

Anyway I correct this tomorrow and let you know if it works better after that.

[YZ250]

On the left hand cam use marking 3 the red one you have marked. On right hand cam use mark 4 the red one not the green.  It would be good for someone else to confirm too as I am going from memory- last time I changed a belt was two years ago!!!

 
Cam 3 is the long notch and cam 4 is the short notch, so the red arrows are correct as said. 

[Jan Suhr]

Now the cams are properly set and the engine runs and sounds like it should.

Feeling good again 

[polilara]

Good that solved, is the belt more "in front" now? Remember I thought it was a bit back.

[Jan Suhr]

Good that solved, is the belt more "in front" now? Remember I thought it was a bit back.

Yes thanks for asking,

Everything in order and proper alignment. The belt runs good on the idlers. The old kit wasn't the correct one for this engine. It had the earlier kit and it should have the later. I expect it to last 60000km as  it should. This is my winter car, instead of changing tyres I swap cars 

When it's duties is over in the spring I will check the status on the cam belt.

[polilara]

OK, hope you have spikes and LSD, some snow will come soon...