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Honda CB550, where to check for vacuum leaks?
Hello there,
I have a 1975 Honda cb550 (k1), stock air box & carbs (no cafe pods, etc). I suspect I might have a vacuum leak, and I want to fix it if there is one before I sync the carbs. At what places would an air leak cause a problem? For example, I don't imagine having an imperfect seal around the intake boots on the carbs where the air box meets each carb intake would be a problem right? Where would it be a problem?
Thanks for any pointers
2 Answers
- Anonymous1 decade agoFavorite Answer
Actually the air box is a finely tuned pule resonator and a leak on one or more carbs between the carb inlet and box can throw things off. More commonly is the mounting between the carb and cylinder head. Old dried out O rings on the mixture adjustment screws can also be a source of leakage. An old trick is to spray some carb cleaner [careful you don't start a fire] around the fittings while listening for a change in the engine note to locate a leak. Good luck and be careful.
- ?Lv 71 decade ago
There are several air hoses involved, and leaks usually occur near the ends or sharp kinks. Your bike is now 35 years old and a few dollars worth of new rubber is a good investment, replace every hose on the bike.
No. An air leak around the carb mouth is not your problem, it may whistle, while checking the hoses check the boots too. You can get these off the net with the hoses but the hoses are about as cheap at the auto store, buy 1 ft more than you need.
