warm up issue (guessing carbs?)

[chris lawson]

1983 Gs450GAD
Bike runs good but doesn"t seem to warm up until you run it at 45 and up for a bit. (gets hot but still seems to bog till you run it on the back roads or highway)
Anyone have an idea what this could be? Bike runs great other than that. I know they tend to be cold blooded but idling it in the driveway even in summer heat still bogs even if i run it for a bit

thanks

[cowboyup3371]

Have the carbs been properly cleaned and synced, valves adjusted, plugs replaced, etc? Are you using the choke to warm it up?

[Steve]

As cowboyup is hinting, there are some basic issues that must be addressed to make sure your bike is set up correctly.

When all those items are set correctly, you should be able to start the bike and ride off within 30 seconds.
By the time you are in second gear, you can turn off the "choke" and keep riding.

.

[old_chopper]

Make sure you have the correct plug. Too cold of a plug can cause this, runs fine after the cylinder/head are hot. I fought this in a race car for a couple months then my engine guru told me to put 1 step hotter plug in; problem solved.
Plus the maintenance items previously mentioned. It all has to work together.

[chris lawson]

carbs spotless and all lines and hoses newer. floats new too. filter new
sparkplugs new. no fuel leaks either

never touched valves or synced carbs...
always choke to start usually cut to half choke after 30 sec.

engine has good compression and everthing.

i have an hour ride to work (give or take) and idles great when i come to stop.

[chris lawson]

plug is correct heat range as recommended in owners manual

[cowboyup3371]

I would at least get the valves checked to start off...when you say the carbs are spotless, was that just a visual check or were they dipped for 24 hours and all passages sprayed with carb cleaner afterwards?

[BassCliff]

Hi,

Long warm up times are a classic symptom of tight valves. If they are too tight for too long they will burn.

You received your "mega-welcome" in one of your first posts. But just in case you missed it....

Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Rebuild Series, and the Stator Papers. (You must address everything on these lists in order to have a safe, reliable, bullet-proof GS.) Now let me roll out the welcome mat for you...

Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff