I am pretty sure that my petroil leak is coming from the seals that are behind the carbs. There are 2 O'rings that go between the carbs body and a plastic spacer and then the rotary disk cover. There is a small slot in the rotary valve cover which accepts the O'ring, and there is (on the carb body) another slot for the o'ring.
I think the slot in the rotary covers is a bit deep, and my impression is that it swallows the o'ring up, not leaving enough protruding rubber to make a seal, with the plastic spacer. I had ordered some slightly different size o'rings for the carbs to try and rectify this situation. Simply Bearings in the UK offer a huge range of products, and I purchased two slightly different types of NITRILE O'rings. I ordered 2mm section ones which are slightly bigger than standard, and one that are 1.78mm section which are standard size.
Unfortunately the larger ones would not stick in the slot in the valve covers, so I used the larger ones next to the carb body, and the standard ones in the valve cover slots. Don't know if it will make any difference - we'll see. | |||
