Home › Forum › Ask A Member › 1955 Big Twin › Re: 1955 Big Twin
June 11, 2017 at 7:50 pm
#59477
If the model number is RD-17S or RD-17R, pull the powerhead and replace the lower main bearing seal. Those seals were garbage and destroyed many a motor by letting water into the crankcase. RD-17 (no S or R) is ok.