Honda GXV530 rev's cycle up and down every 2 seconds?

this is a common issue with these engines and may be unsolvable
try the coils for even blue spark at the plugs

Geoff
March 2016

cleaning may help but the root problem is incorrect mixture setting or blocked jet. The fall in revs causes the governor to open up the throttle, the engine picks up speed with a surge reaches the upper rev limit set by the governor but as the mixture is unstable the engine speed falls again to repeat the cycle. Remove any idle or mixture control screws (counting the turns to remove so they can be replaced exactly in the same position). Check the air and fuel jets are clear.

vlad
October 2010

It sounds like your carb is dirty.you need to take it off and take it apart soak it in either carb cleaner or boil it in soapy water. If you use carb cleaner make sure not to get any rubber parts in it. they will swell up and won't work

hogdoctor
September 2010