Poor Performance Upon Warm Up

[BassCliff]

Hi,

Could your needle jets and/or jet needles be worn? It doesn't take much.

http://www.factorypro.com/tech/needle1.html

http://www.factorypro.com/products/Mikuni_needle_jet_buy.html

Thank you for your indulgence,

BassCliff

[Jebus23]

I just did the valve clearances, they are all within spec. I guess I will pull the carbs AGAIN. I'm trying not to guess here. Anyone seen similar problems. Just took it for a ride. I doesnt want to go over 3500 rpm and it struggles bad up hills. After it completely bogs down and losses all power, I shut it down for five minutes, and get enough to get home.

[Guest]

This is probably not your problem, but I just read another thread about exhaust out the carb... there was a rock in the exhaust sustem... look for this thread... Maybe?

[Guest]

The members name is Danjal... He told you to check your exhaust just in this thread. Look under carb,fuel,exhaust tech and you will find his thread...

[Jebus23]

Saw the thread, pulled the exhaust, and took it down the road with no pipes. It doesn't seem to be any better. It was very choppy running with no real power. o smoke out of the airbox though. I am running out of ideas.

[Turtleface]

Saw the thread, pulled the exhaust, and took it down the road with no pipes. It doesn't seem to be any better. It was very choppy running with no real power. o smoke out of the airbox though. I am running out of ideas.

Is that something one should do? I was always told (on car engines, albeit) that running without an exhaust is very bad.

[Guest]

Don't run without an exhaust. You'll burn your valves.

[850 Combat]

I have had coils go bad so that they shorted out when hot. They would work fine for about a half hour, then the bike would quit.

You said that last year it ran OK for 45 min. but this year it doesn't, right?

Your bogging symptoms certainly sound like carbs with non functioning pilot circuits. If choke helps, that confirms it. How are you cleaning them? The pilot circuit comes from themain jet, the brass air jet in the eir horn, the pilot jet, the air screw, and two ports by the butterfly. There are lots of internal passages in the pilot circuit. If you hate to separate the carbs from the rack, like I do, thak the air screw, pilot jet, and air jet out and clean them. Look through them. Spray carb cleaner into the ports these came out of and confirm that it comes out of all the other ports. Reassemble replacing the two O rings in the pilot circuit.

[Guest]

Number 4 is too rich. I doubt that the smoke you see in your airbox is exhaust. It is most likely from your crankcase. Do you have a hose attached to your airbox that comes from the top of the valve cover? Have you cleaned out that hose or taken off the cover from where it hooks up?

Looks to me like you need to address why #4 is rich. My guess would be carb adjustment or bad spark plug wire/boot.