High Idle Problems

[Suzuki_Rider]

Hey all,

So I am new to riding and the mechanics behind everything. I recently bought a 2005 Gs500f. The problem I have is that when its on choke and I rev the engine it idles super high and stays that way. After letting the bike warm up and for the first hr or so of riding the choke has to be on slightly in order for it to start from a stop and not stall out. However, when I come to a stop with the choke on it again idles high until I close the choke, but I have to put it right back on in order to start. My dad, a seasoned rider, thinks I should replace my gaskets, not sure which ones or if that is the problem.

Any suggestions would be awesome. Thanks.

[jaynavajo15]

 My 06 with the choke fully engaged idles at about 4500-5000 rpm I believe. the gs is supposed to idle at 1500 rpm when fully warmed up with no choke. Get it warmed up to operating temp and if the idle is higher or lower without the choke then adjust the idle screw underneath the carbs. A 20 minute ride will get it to operating temp. I would start there. I'm a fairly new rider myself and also got a idle issue my bike when warmed up idles at about 200-2500 rpm I've just been putting it to the side. Don't be lazy like me do it haha and not trying to be insulting but have you considered you just might be stalling yourself and you really don't need the choke to get going you shouldn't need the choke to keep the bike running once it's reached operating temp.

[Supa]

Some questions:

Do you have a list of previous services?

When was the last valve clearance check?

Have the carbs been cleaned/synched?


My theories based on what you have said starting with the simplest first:

Your idle screw is set too low and your bike dies out when you come to a stop. Solution: Set your idle to about 1200 RPM.

You have a vacuum leak somewhere. Solution: Spray some WD40 around the carbs while the bike is idling. If you hear any changes, that's where your leak is. Replace leaking gasket.

Your exhaust valves are too tight. Solution: Check your valve clearances to make sure they are in spec. If out of spec (typically too tight on exhaust valves), replace shims to get on the wider-side of in spec.

Your carbs are a bit out of whack: Solution: Pull and disassemble the carbs. Clean the carbs thoroughly and inspect the o-rings/jets/floats. Check your mixture screws and set to 2 1/2 turns out (fine tune once reassembled with bike idling).



I had an issue similar to this. I had my idle set very high. If I tried to set it lower, the bike would die at every stop. Setting it just high enough to prevent it from dying would send the bike to a 4500 RPM idle. The above list was my order of checks (except I did the carbs before checking the valves). It ended up being tight exhaust valves. Re-shimmed and it solved my problem.