MRC Forum- brought to you by www.morini-riders-club.com Member: g7AW3f

This video explains it well. I drilled a hole where he suggests:

[urlhttps://www.youtube.com/watch?v=euRfvhFmGrc][/url]

The lock is the same as the VESPA ET3 PRIMAVERA SPRINT RALLY MK1 PE PX P200, for example: https://www.ebay.co.uk/itm/154548382718

Just a thought re timing marks on the cam pinion and crank pinion. As long as the cam pinion dot aligns with the mark on the crankcase, and the crank keyway aligns with the dot on the case, the position of the marks on the crank pinion dont really matter as long as you can get the belt on and maint...

3potjohn wrote: ↑24 Aug 2025 18:32 Glad it is sorted- that photo was not of mine , just seemed clear. Mine shows the usual mix of age and “deposits”.

i thought it was too clean! A very clear picture though

norbert wrote: ↑24 Aug 2025 17:22 Now it looks like it should be!

Thank you, yes not much, but ir makes all the difference!

I started this thread because no matter how much I adjusted the ignition timing, I could not get the ignition timing marks to line up. I have discovered the reason for this was that the camshaft sprocket was put on using a different mark. Having set it to the other mark, the timing marks can now be ...

That looks far too clean!

All sorted, no longer needed. I used the old cut belt as a tool similar to the Blue Book, as the teeth were the correct pitch.

As I was checking the marks using the old belt which I cut to remove it, I noticed another mark that was made on the pulley. This mark enables the top sprocket mark to line up much more accurately with the mark on the engine casing. I assume that when it was last off, it was lined up with this mark....

Hi, if you mean the rubber mount, it just lifts out?

Thank you, but I want to be able to easily remove the belt several times to set up the valve timing, and ensure that the woodruff key goes into the correct slot. Thanks for the tip, I will use that when I come to put the new belt on when everything is set up.

A strange request, but I am about to set up my valve timing having removed the bottom sprocket. I have a new belt, but it is very tight to get on and off. As I want to ensure the valve timing is correct, I will probably need to remove the belt a few times.

I will of course cover postage.

Thanks, yes, I will set it at that. It was just about self reassurance that everything is OK. I now need to set up the valve timing, using the the correct slot in the sprocket to ensure that it is within 3 degrees tolerance.

I have now removed the nut holding on the camshaft. The woodruff key appears to be there, so I will reassemble it. The sprocket is tight on the shaft, and if it is keyed in place, I am happy that it is not moving, and is in the right place, as there is only one slot.

Hi, yes it does have the woodruf key, but there was some play. I am however now completely confused (easily done!). When I took the cam belt off, the camshaft sprocket mark was pointing at the TDC mark (top of the case). Both valves were closed. They are now both open, and to get to a position where...

After further investigation, I think I have found the problem. When turning the crank, sometimes the cambelt was not turning the bottom sprocket, and appeared to be stationary. This may explain not being able to get the timing correct. I removed the belt, and the bottom sprocket came off by hand, so...