N15 Tacho Drive

Hello Chris - Make a suitable gasket to fit in the indent in the timing cover and large enough to cover the gearbox fixing holes.  I usually fit cap-headed allen screws with a thin washer on the inside of the timing cover pointing outwards. Ensure that they don't foul against the canshaft chain.  Apply a small amount of Wellseal to the gasket fit the gearbox and use two sturdy 3/16 inch washers and then fit the nuts quite tightly.  You may need to buy the screws washers and nuts.  I believe they are 3/16 inch BSCycle thread.  I think I use 3/4 inch long screws.  Run around any excess gasket paper with a Stanley knife and it should no longer weep.  Good luck, Howard  

The rev-counter used on all the 750 Atlas engines, and the 650 and all the Hybrid bikes, is the Smiths BG/1508/05. The clock is a 2.1. The 05 part is the depth that the rev-counter fits into the timing cover. The only time i have had an oil leak from a rev-counter drive is when i have fitted a pattern one, that had an oil leak from the underside of the rev-counter, in the timing cover, and also via the cable end, that went into the rev-counter. I then put a genuine Smiths one in and all the oil leaks stopped. I put the pattern ones in a box in a draw and never used them again.