When I get to higher RPMs the bike loses power/torque and dies.

[andrewclaycomb]

Alright, hopefully I can get this figured out this weekend.

When I ride around town 40 mph and under the bike runs fine. When I go on the highway 65mph the bike will run fine then suddenly lose power, after pulling over on the side it won't hold idle. Eventually the bike will die. I can then start it again and everything seems to be fine, until I get to higher RPM again.

I have a feeling it's electrical, but the coils are less than a year old (GREEN DYNA) same with the ignition (DYNA S) just changed the plugs, and the battery is sealed and on a Yuasa tender all winter (battery is also less than a year old). The bike hasn't done anything like this since replacing the ignition (and discovering a shorting wire). The carbs have just been rebuilt by Wired George (less than a week ago) and the bike runs better than ever before until it loses power.

any ideas?

[Dogma]

If you had said gradual loss of power, I would guess fuel flow. After all, carbs were the last thing monkeyed with. How sudden is the power loss? Does it take a mile or so after riding ten, or is it more like flicking a switch?

[andrewclaycomb]

It's very sudden, just like flipping a switch. I will be at highway speed and then I won't be able to accelerate and can hear the carbs bogging. If i keep giving it throttle I can keep the bike running but it won't hold idle. Sounds like I might be losing a cylinder or two. Yesterday I was on the highway for about a mile when it happened. I pulled the petcock to see if it was clogged and it still looks new. It is also happening both on prime as well as run.

What's so frustrating, is it will start back up and run fine at slower speeds.

[Kcwiro]

it certainly sounds like something is clogged, or perhaps you have a air leak that does not come into play until you open her up. You replaced all your rubbers recently right?... valve cover hose is attached firmly...air box is not loose?... you tried pulling the plugs after the stall and seeing if they are leaned out or damp with gas\?

[andrewclaycomb]

All of the rubbers are new, and the bike's podded. I did just take the gas tank off and discovered the the fuel line was sort of kinked by the carbs. Not completely but definitely kinked. I wonder if that is my problem. I'm gonna go test ride and see if it made a difference.

[gaillarry]

Try it again, when it happens open the gas cap, if the bike runs fine, its a vacum problem. Good be a bad gas cap or faulty vacum line.

[Smokinapankake]

+ 1 on the fuel issue. My GPz did the exact same thing until I realized the gas cap vent was plugged with Kreem.
Try draining fuel from the tank through the fuel valve, with the gas cap secured, until it stops running. Open the gas cap and watch the fuel flow again!!

[andrewclaycomb]

I feel like an idiot, the problem was a kinked fuel line, from putting the carbs back on.

[tkent02]

No, an idiot would have bought a new stator to fix it.

[andrewclaycomb]

Or sold the bike for $600