PVL Timing

[2T]

Well, it's a bit of a relief to now have a direction to head in, rather than flying blind. I have two other heads, so will see which is suitable for use.

The motor is fully disassembled atm after checking integrity of crankcase join seal and testing for cracks in crankcases that may have been opening up at high temp and letting pressure into the gearbox. Both were fine so will work at getting it back together. Have never assembled a bottom end or installed an ignition, so that should be interesting.

[2T]

Pokey, regarding your last post mentioning the possibility of an air leak, even though the leak down test was fine.

I have just been reading an article on http://kenoconnorracing.com/ The article is http://kenoconnorracing.com/vacuum-leaks.php

He mentions oil coming out of the gearbox breather as a symptom of a clutch side crank seal leak or a crankcase leak between the crank and gearbox. I had had oil coming out the breather a few times before it started leaking from the seals.

My crank seals are only eleven hours old, and I wasn't going to bother replacing them, but I will now. Will also concentrate on getting a good seal between the two crankcase halves. Oil was leaking from just behind the cylinder, right near the breather outlet, so it may have been travelling from the crankcase through to the gearbox.

Thanks for the tip!