Hello again all,
Thought I would give you a bit of an update on my Mk1.
If you may recall I have been having issues with my head gasket blowing and some carb problems.
Thanks to the assistance of various people on this forum I have now hopefully manage to sort the above mentioned issues out and have now completed around 400 wonderful miles on the old girl.
I have however had two minor issues arise, firstly: quite a bad vibration from the rear wheel. I suspected an out of balance wheel but when I took the wheel to my tyre specialist to balance, he said the rim was not running true. So have taken the wheel to have the rim trued, so hopefully that will fix that.
Secondly: The bike starts first time every time and is running perfectly, pulls well etc, but ( there's always a but ) I have noticed that when she gets hot after a longer ride , say about 30 miles, the motor has a tendency to pink / ping ( what ever you want to call it ) down low or under load in a higher gear, indicating to me slightly advanced timing. Not all the time but often enough to be annoying.
I have checked and rechecked my valve timing and checked and rechecked my ignition timing. Both are correct. With the ignition timing I have set it up statically using a simple 6v light set up across the points to show when points are opening. They are opening just before TDC. On the MK 1 timing is supposed to be set at TDC. If I try to retime the distributor by retarding it a tooth then it's way out.
I am running slightly higher compression pistons. I have spoken to Gui who has the same pistons and he has said he hasn't had any pinking / pinging issues with his bike.
As always any assistance appreciated.