2006 K9 Fires Erratically in the 70mph Range

[avatharv]

My 2006 K9 spits and sputters at the low end 70mphs and the upper end 70mph.

I thought it might be the carb not jetted correctly, but it was pointed out that it could be the ignition. Any ideas or ways to test?

 

[HMAN]

Replace the rubber/silicon caps on the carb n go for a ride. The may have dry rotted n are sucking air @ speed?

 

[Mickeetwo]

Are you running a spike air filter?

 

[avatharv]

Are you running a spike air filter?

Why yes I am.

 

[Rottweiler]

Is it aiming front or up?

 

[Sven]

Plug wires degrading? Sounds like spark.

 

[Snuffy]

I would say it’s the little things that matter. Is there anything you changed before it started? Check plugs, wires , if you haven’t in a while change them. Then carb , bad fuel , filter , something fuel or spark related would be first suspects. Good luck

 

[mleach72]

Check to make sure the auxiliary vent plug is removed. As Harry said, check all of your rubber caps are in good shape. Check for intake leaks by spraying WD40 around the seals. If your idle changes, you have a leak. If you are running with no baffles, you may need to up your air bleed jet.

 

[avatharv]

Is it aiming front or up?

Front

 

[Mickmorris]

Why yes I am.

Get rid of it…

 

[Mickmorris]

Front

You need to ditch that. Definitely part of your problem…

 

[Rottweiler]

If you can aim it straight up. See if that changes anything.

 

[Rottweiler]

I have a K&N not a spike but I found out mine runs better pointing up not front.

 

[aspen874]

I had a similar experience with the spike air cleaner around the same speed, I would try a different air cleaner

 

[Mickmorris]

I had a similar experience with the spike air cleaner around the same speed, I would try a different air cleaner

That air cleaner performed so poorly I gave it away to another member on this forum and paid the shipping just to get it out of my garage… I did warn him not to use it. But he wanted it for the look on the bike…

 

[Jersey Big Mike]

I have a dual cone style not quite spikes on my bike and running with the rain socks on the bike performed much better on the trip to AR this year as opposed to last year.

 

[avatharv]

I changed my plugs to iridium and not only does it feel like another 10 hp, but it made my problem less bad. I can still feel it sputter near 80 or so. I can deal with that.

 

[john sachs]

Good advice above. Get rid of that a/cleaner. You will never understand, how MUCH power it's costing you, until you change it. Use a S&S or an equivalent to the S&S. Jet the carb properly.
John