Remembered that I had a spare flywheel that came with the original spare engine, dug it out for comparison and found firstly that the four locating peg holes were chewed and ovalised Which matches the pegs in the end of the old crank, must have been loose at some point! Anyway comparing the oil seal mating surfaces between flywheels, the one I have been running appears to have been machined and the seal is a noticeably tighter fit on the older flywheel So I will invest in a new flywheel, genuine seal and O ring, new gland nut and am pretty confident that should sort the problem!
Well done to Paul Weeding. What you need to do now is fine out how much has been machined off and buy a seal to suit. Read the size off the standard seal (outer dia/shaft dia/thickness - might be shaft, outer, thickness) and get one for a smaller shaft. Google "rotating shaft seal" probably cheaper too. I was going to mention the case has been machined as well. I think it would be wise to check this diameter too as you said it seemed easy to fit. If you're not tooled up this will do it. It'll be whole mm's. http://www.ebay.co.uk/itm/150mm-6-I...UK_Measuring_Tools_Levels&hash=item43b4bb2073
I was thinking that the flywheel looked a little odd!! Like Zed says... don't spunk a load of money on a new flywheel... have a measure of what you have and buy a seal to suit!!
i just had to replace my oil seal dude which was a doddle but getting them locating pins to sit right to get the fly wheel back on ..OMG what a nightmare just chill with it should be fine
The next size down available is 68mm As opposed to 70mm internal diameter seal, bought one anyway to see how it fits? Tight is the answer, probably melt as is, might have the flywheel machined to suit but can't be waiting so have bought new flywheel, genuine seal and o ring, gland nut and washer and a selection of shims! Should be back in and running on Saturday!
