1982 gs450T. Boggs on heavy throttle

[klm]

1982 gs450T. Boggs on heavy throttle,

Just bought this bike and it runs fine otherwise. When I really open it up it boggs down and won't recover until I back off of it. It does this at any RPM or speed, load, uphill or downhill doesn't make a difference. If I accelerate normally it's fine.

Thank you,

Kurt

[Tab B.]

Well Kurt, can I ask you a few questions first? Is this your first street bike? To the best of your knowledge, is the bike stock and in a good state of tune? If so on both, I can give you some generalities. Most street engines really don't like HEAVEY throttle applications. In the case of your carburators, they aren't set up like a car type. They don't have accelerator pumps. Your bike has what are called "constant velocity" or "CV" carbs. When you wack open a throttle a little too fast, even with a CV carb, at that point, there isn't very much air velocity in the carb throat. Low velocity means low vacuum, which means low suction, which ultimately means that very little fuel is being drawn into the airstream. Low fuel, low power. CV carbs do go a ways to help combat this, but they can only go so far. Factor in the relatively lean jetting that the bike needs to make the EPA happy, and you end up with, well,,, a bog. Most of us become adept at being good at "roll ons". Rolling on the throttle aggressively, but not to the point of bogging the engine. How aggressive, depends on the bike and the conditions. Each bike is different.
On your bike, I would look to see if anything has been changed. Check to see if it has an aftermarket air cleaner, like a K&N, or if the air box has been altered. If either or both is the case, and,,, the bike hasn't had a jet kit installed, the bog could be worse than it might be with a stocker. The only way to tell if it has a jet kit, is to take the carbs off and inspect the parts against an OEM parts list. I could get really involved here. I'm going to guess that your bike, being a "T", hasn't been messed with. The "T" model wasn't marketed as a sporting machine, like the "S" model was. So it wouldn't be a likely candidate to be messed with. If the bike runs good everywhere else like you say, you are probably just being too aggressive.

[Easy Rider]

Originally Posted by Tab B.

If the bike runs good everywhere else like you say, you are probably just being too aggressive.

Good post. Read it over a couple of times for all to sink in.

Just for emphasis, if there IS a (fixable) problem it's likely to be intake, exhaust or carb related. Check the intake for proper filter, the muffler for excess restriction or gross mods (ie. NO restriction) and run some carb cleaner through with a couple of tanks of gas.

If you have a good dealer in your area, a 2 minute "look" and 2 minute test ride by a mechanic would probably tell you a LOT more than we can here.
That shouldn't cost you much and if they are a REALLY good dealer, it won't cost you anything.