It may surprise you to know HONDA didn't put Lock Washers at the carbs or exhaust.
The carbs did come with a Spark Plug wire holder mounted to the outside studs.
As for the "O" ring seals the only ones I've seen which warped the carb body were not the correct thickness or diameter.
It is possible to reuse the ones that were on the bike if they are not damaged.
Do it right and there will not be a leak.
I've restored (FULLY) many of these HONDA MC and engines and the owners get a correct restoration rather than a "What I think is necessary" that HONDA didn't and NEVER a LEAK or Warped Carb Body. ....................lm
Nick wrote:Why? Couple reasons:
1. Without the lock washers the nuts might loosen.
2. Without the lock washers the person installing the carb may be more likely to over-torque the nuts to prevent them from loosening, thereby warping the carb body.
Self-locking nuts (the shorter, all-metal locking type rather than the tall plastic locking type) would of course eliminate the need for lock washers.
Locktite will also do the trick. Whatever method one uses, the purpose is to be able to tighten the carb nuts only enough to seal the O-rings but not so much as to warp the carb and without the nuts loosening.
On the late sixties Triumphs, the carbs are mounted with stepped studs and dished washers containing O-ring/washers that prevent the carb from being over-tightened. This because the Amal concentric carbs will easily warp if overtightened. So for anyone out there fitting Amals to their 305, use lock nuts and don't over tighten!