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Thank you Peter,I would not recommend it, there is just to much risk of potentially dislodging debris that has built up over 70 years, but not actually getting all that debris out of the tank, then there is a good chance that some of that debris will find its way into the lubrication system and wreck your engine, it is simply not worth the risk, plus removing the forks is not a particularly difficult job.
Thank you Timetraveler,This was all discussed a week or two ago and I posted the design of an inspection/cleaning hole for the top of the oil tank. You will not do this properly unless you remove the UFM from the rest of the bike so that you can shake it about to clean it and even then you will probably need to make, or buy, an inspection hole modification.
I am in no hurry. I would buy it for future use, for when I have time to properly dissemble the bike.Thank you Richard. One chap has already made his own from my drawings and I have asked him if he is prepared to make any more. I could get them made but I would probably have to get ten made as they would be CNCd. You, plus one chap in the USA means that two would be sold. Let us see if anyone else is interested.
If you insist on cleaning the tank out, Life then becomes far more easier if you detach the tank fom the front end by removing the 6? bolds holding it to tht front of the bike.take out the two connectors at the rear of the tank. you can use lots of degreaser to soften the junk in the oil tank,and a pressure washer and keep going untill you are satisfied it is clean. Dry out the tank using heat and refit the chain oiler and the mail feed with new washers. It is a filthy job and you can make a lot of mess every where. I speak from experience. then refit it to the head stock.Any hints on how to best clean the sludge out of the upper frame member while still attached to the front forks?
Rockford, IL, USA
Yes, the banjo bolt at the lower end of the main oil feed line, I have heard of people drilling the holes bigger, but how much bigger?Re #15 above. The restriction in the oil flow can be caused by the cut off valve which is fitted into the oil feed in order to allow the pipe to be removed from the tank without draining the oil. You can just remove that valve and then you have the whole inner diameter of the connectors and tubes to allow oil to flow. When you have it all apart it is worth while checking that when the oil pipe is inserted into the tank fitting that the valve is pushed fully up and that the holes in the valve are fully open. The thing to think about is that the lower end of the main feed pipe interfaces to a banjo bolt which has four rather small holes and their total area is likely to be less than the internal area of the pipe.