intake o rings

[shooter64]

I see posts that intake o rings have to be replaced, often before 50k. What are the symptoms that appear as they get to that point?

[mmurffy03]

ruff eneven idle you can spray starter fluid at the base of the intake runners if rpm goes higher there is air getting by the o rings beware this is also a small flame thrower you are building my bike had only 8500 miles on it and was stored in a heated garage and the orings got hard and let air seep thru at idle causing uneven idle went away with new orings

[Thunderbolt]

visually, you will normally see some brown liquid around the joint between the head and intake.

[sandy]

If you need them, they are a #123 size and if you find them in viton or silicone you'll never have to replace them again. Hardware store has buna N. Not good for heat and fuel applications.

[valkyriemc]

This link may help;

http://www.valkyrieforum.com/bbs/index.php/topic,26466.msg239935/topicseen.html#msg239935

[BradValk48237]

I just ordered a set from Redeye.  12.98

Brad

[whitestroke]

I've also heard propane torch/no flame will find intake leaks.