You could always devise a secondary injection system that just squirted a very small amount of castor oil into the inlet ports, or maybe even the exhaust manifold, to get the smell.

Off to the Rudge and Velo Owners Xmas dinner today - no doubt stirring tales of hip replacements, prostate problems and almost certainly riding the silver rocket! uk/itm/Castrol-POWER1-R-40-SAE-40-Castor-Based-Racing-Motorcycle-Engine-Oil-1-Litre-1L/162764390339? As mentioned earlier I even put it in my mower to remind my of Lydden Hill, I do remember the lads at Roys of Hornchurch in 1971 ( Royspeed ) told us that R would not do the crank seals any good ? I used to think I was a petrolhead because I could syphon petrol and not gag until I saw my mate testing hydraulic fluid by dipping his finger into it and tasting it. The 103 third parties who use cookies on this service do so for their purposes of displaying and measuring personalized ads, generating audience insights, and developing and improving products.As a spotty youth in the 60s I used to put it in my C11G the bloke in the garage reconed we were mad to put it in with the petrol the smell was great.

I mentioned this to the Club ‘sage’ at one of our social meetings, knowing he used to use Castor oil when he did a bit of scrambling back in the day, (when he was very much younger) and his son races. I have e-mailed Castrol to ask whether or not the sweet smelling oil 'Castrol R' can still be purchased and be used in modern bikes, I have pasted their reply below.I've been told that you can put a teaspoonful in the tank, but I wouldn't know if that's enough to create the beautiful smell. Castrol R used to always separate from the fuel that's why we had to shake our bikes before we started them (I still do that now!

I've got a bottle of it somewhere in the garage that I occasionally used to mix with the petrol on my old 2 stroke bike. I may be wrong of course but if I remember correctly then there is an alternative which smells the same.Hope the pic ain't too small to see but this is the extent of carbon build up after running the engine for years on a mixture of Castrol R40, plain modern mineral, part-synth, fully-synth, and sometimes a mixture of one, or more than one other of the aforementioned. I think I would like some more information on the Marvels Mystery Oil and as far as the Sea Foam goes, I have only heard good things about it! But where the oil layer is thin — on cylinder walls and cam lobes, for instance — it ensures a higher level of scuff resistance.