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That is a very nice original GTR!...bert
Steve, Thanks for two great reads, brought back a lot of memories for me. Through a number of lucky coincidences, I was fortunate enough to have a GTR for 3 years back in late 60s, never forgot that bike and returned to the fold 4 years ago. Very pleased you have achieved your dream, lovely example of a GTR. Also remember, in vivid detail, low siding my Aermacchi 250 on a hairpin bend, sliding feet first in a crouched position, clawing at the tarmac to stop myself - that hurt !! Broke off the right side clip-on , 50miles from home, hammered a tubular plug spanner on to remaining stub to get back. Funny how these moments are welded in our memories, unlike the time me and a mate baled off his Velocette Thruxton. Got a knock on the head and a broken jaw from that one, to this day I have no memory whatsoever of what happened. Happy days, eh, and hopefully many more to come for both of us (without the offs ) Brian
i do have an oil leak or leaks (drips, nothing hideous), difficult to know where oil is leaking through or past, the underside of the engine needs to be cleaned.... is there a place where the GTR's can be predicted to leak or usually/typically can be expected to leak from?
Steve, If you intend to ride her before overhauling, have a look at the air cleaner. The old thin foam or flock, as sometimes referred, (under the metal mesh) will have disappeared or detached itself. Add a new, thin, 1/4 inch layer of foam to the outside of the mesh. The chrome bores need all the help they can get to keep the dust/dirt out. Brian.
I'm with you - don't overhaul the engine or anything else unless there are signs that it is needed. Treat it as you would any used car or bike. As far as the engine is concerned, I know from experience that cylinders, pistons, rings and bearings are good for 40,000+ miles. The crankshaft has an aluminum labyrinth center seal, so no worries there. The rubber seals on the ends of the crank can be hard after this much time, but don't require an overhaul to replace. Even wheel and steering stem bearings should be good since outdoor weather obviously hasn't been an issue with your bike. You might want to re-grease those bearings when you get a chance because the original lube probably didn't survive very well.
Mine is the highest mileage 350 I've seen at 43,000+ miles, although there may be others out there. I've had it since '74 and rode it to work for many years. I use a modern synthetic 10w30 engine oil. Any modern engine oil is fine, even those with friction reducers. Since the BS 350 has a dry clutch, you don't have to worry about friction reducers affecting it as you would in the smaller BS bikes or any others with a wet clutch.