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Discussion Starter #1
My name is Art, live at the end of the road. Been riding over 50 years, mostly Honda and HD. Consider myself “mechanically functional”. I have stripped down, disassembled and rebuilt 2 bikes over the years without incident.
Current project is a 1972 Honda CB 175. Bike has sat at least 20 yrs. Issue at hand is surging on startup, as previously noted.
Would appreciate any insight as to possible cause and suggestions that anyone might have.
 

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Hello Art, welcome.

Surging can be caused by:
fuel supply issue, like clogged tank vent or line
Dirty air filter
Blockage in carb, ethanol goop, rust particles from tank
bad gas , water in gas
air leaks, i.e. cracked intake boot

Good luck!
 

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Retired twice: Navy and as a govt contractor
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Welcome to the forum. Johnny has given you a good list of things to look at
 

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American Legion Rider
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WELCOME ON BOARD, and...

We are friendly site here. Well, most of us.
 

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Ace Tuner
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Welcome From Texas :)

62378


I would suspect a lean condition of some sort to be the cause of surging, most of the time.
Johnny mentioned possible air leaks in the intake boot. That'd be the first thing I'd check.

S F
 
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