Re: Idle low with choke, high after warmup?

Posted by LukeM on
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Idle-low-with-choke-high-after-warmup-tp4029320p4029322.html

Welcome to the forum.
On the home page, you'll find a pinned link to Manuals for these bikes.  Get yourself one.  You'll find all sorts of information and troubleshooting tips.  Pretty handy.

I'd go through the Tune-up section of the FSM, and get everything set there.  Then you can worry about carb sync procedures and such.  You may be looking at a carb issue, but I have noticed that after I've ridden my bike for a while, the idle will be up about 10% or so.  It eventually settles down to 1K, where I set it originally.  If you're idling at 2K all the time, that's not horrible.  These bikes are pretty efficient if they're in good tune.  I remember getting between 40-47mpg with my 79 CB750. My current Shadow gets about that as well.

Find a deep well 18mm 6 point socket to remove the spark plugs.  If you're lucky enough to have the factory tool kit, there's an 18mm spark plug wrench in there as well. I know some on this forum like the Iridium plugs. They deliver a hotter spark, which can help with a weaker ignition system.  If you decide to sync the carbs yourself (you can...it's a VERY easy process), you can expect to find the 4 gauge carb sync package on EBay for between $50-100 USD.

I hope this helps.  Keep us in the loop.
Luke M