I have 2004 honda saber idles but no high rpms and backfires
Backfiring can be caused by fouled spark plugs (you have four,two per cylinder), bad spark plug caps, bad air cut valves on the side of the carburetors, but most likely leaking exhaust gaskets. I am guessing that you have changed the exhaust system but did not put new crush o-rings between the cylinder head and the head pipe. You should also change the tubular gasket/seals between the head pipes and the mufflers. If this does not fix the problem , take out the two screws that hold the air cut diaphragms in place and remove the covers . If the rubber diaphragms have holes in them or have become sticky they need to be replaced. Air cut diaphragms turn off the fuel during deceleration to prevent back firing. If they go bad they can cause poor running , popping , and back firing during normal operation.
Everything you are saying makes sense. However, I've searched the internet and I'm trying to find where you can purchase the parts you are describing above. Any help would be a ton of help.
Honda sells spark plug caps. NGK also makes the same cap for $5 to $10 dollars.
Honda sells fuel cut diaphragms. K
Babbitsonline or bikebandit
Inexpensive fuel cut diaphragms can be purchased from K
KandL supply
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