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post #1 of 15 (permalink) Old 01-04-2013, 06:54 PM Thread Starter
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89 exciter bogging

My 89 yamaha exciter has a bad bogging problem after half throttle. If i hold it right at half itll hit about 50-60 but if i go anything morr it just bogs down to about 4500 rpm and stays there. Ive cleaned the carbs about 4 times and have cleaned the fuel pump. All the vent lines are fine and flow freely. It has a new coil pack. But one sparkplug is a dark brown and the other doesnt seem to have much color. They both are new but this one is black and white. I cant think of anything else to do! Anyone have any suggestions??
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post #2 of 15 (permalink) Old 01-04-2013, 07:42 PM
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have you checked the carbs to be in sync? almost sounds like it could be part of the problem. with those round slides, it doesnt take much to offset them.

another thought would be the needles. on a sled that old its not uncommon for the needles attached to the slides to wear or corrode and upset the flow of fuel.
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post #3 of 15 (permalink) Old 01-04-2013, 09:50 PM
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Just a thought, but put new tank of gas in. If gas is old and has been in tank a while it losses some of its spark. I had a similar issue and found the gas was bad. New gas and problem solved. It's worth a try, unless you've already done so.

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post #4 of 15 (permalink) Old 01-05-2013, 02:13 PM Thread Starter
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just drained the tank and filled up with fresh gas, it still bogged and one plug stayed wet. i decided that it was good enough to trail ride and when i got there it didnt start at all.
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post #5 of 15 (permalink) Old 01-06-2013, 04:26 PM Thread Starter
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Im stuck, i have spark, plenty of gas, and compression. Timing is dead on but it wont even sputter. I drained the crankcase of gas but the fuel pump is good. I have new plugs in br8es.
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post #6 of 15 (permalink) Old 01-07-2013, 07:04 PM
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if your crankcase was full of gas, your fuel pump is bad or your carbs arent sealing. you may have a bad crank seal.

prime the cylinders and see what happens. about a soda bottle cap full of fuel into the spark plug holes and see if it fires.
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post #7 of 15 (permalink) Old 01-09-2013, 06:58 PM
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Also make sure your choke pucks are clean, moving freely and adjusted properly. I am jetted at 2000 feet and run BR9ES ( I prefer BR9EV I found I had less fouling plugs)
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post #8 of 15 (permalink) Old 01-09-2013, 08:13 PM
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he should be running the 9's. the 8's are probably too hot. i wouldnt run them in temps under 40F.
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post #9 of 15 (permalink) Old 01-09-2013, 08:54 PM
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With your choke pucks moving properly your cable adjustment should about 2 mils play when the chokes are turned off.
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post #10 of 15 (permalink) Old 01-11-2013, 07:07 PM Thread Starter
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the choke cables are frozen in place and icant pull them out. i think they are rusted and could it be the float height in the carburator bowls? i went and bought 8's just to tune it the mixture without it fouling then ill go back to 9's
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post #11 of 15 (permalink) Old 01-12-2013, 05:42 AM
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Not rusted as it is brass against aluminum, but oxidized.
You can get them out with some penetrating oil and patience.

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post #12 of 15 (permalink) Old 01-12-2013, 10:07 AM Thread Starter
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The needle valve had a piece of string in it but it still is flooding
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post #13 of 15 (permalink) Old 01-12-2013, 04:01 PM
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Are your choke pucks seized in the carbs? If they are in there you have to get them out and make sure they are clean and moving freely.
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post #14 of 15 (permalink) Old 01-12-2013, 07:48 PM Thread Starter
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got them out, cleaned them up, to start it i had to gap the plugs at .010, starts hard and only one plug is coloring. i used a timing light to verify and i dont have spark on the clutch side. the coil pack is new also so i am stumped
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post #15 of 15 (permalink) Old 01-13-2013, 02:28 PM
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If you switch the wires, does the spark follow?

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