92KK 84WW Olaf
Life time member
Number of posts : 7954
No.....because I found a Randolph tank in US, which incidentally is still there with Ronald Scibetti on FB. It was $750 which was reasonable enough as it takes all the standard K bike pump etc etc inside the tank. problem for me was $250 upwards for shipping cost then add tax 11% and VAT 23% on the lost and then painting at this end.....so it stalled a little.
Then I bought a K1100LT tank for the same money.....but it came with the complete K1100LT attached and is more economical. I just did one of those round trips on it last Monday.
If you box clever under the seat and remove the battery and the other gubbins under the seat just get a block of polystyrene and patiently saw it way until it will fit. You will need to mount it on rubber but that can be done on the battery tray and if you box really clever you could use the original battery clamp screw holes for mounting. You will need to resolve the coolant expansion bottle but as race guys will tell you, it can go anywhere. Having an RS to work with I can tell you its possible to locate it up front inside the fairing. Its not heavy. By making the top of the tank removable you make it easy to avoid removing the tank for routine servicing. A nice side effect is that if you run the fuel down removing the original tank for maintenance is a cinch.
My calculations suggested you would get 7 litres extra by doing this. However I think the usable extra would be higher as most of us only see about 18 litres max out of the original tanks 21-22 litre capacity.
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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles.
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles
Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500