My 07 with stock everything except the Cobra slip ons appears to be running real rich. Up untill lately my slash cuts were real clean, now how ever they are black as all get out and are leaving black residue on my rear fender. I have changed the stock air filter thinking it was stoped up but to no avail. I only use name brand premium gas with a shot of Seafoam at every fill up.

If you are running 97 octane then switch to 85. The R* doesn't need or like the high stuff there isn't enough compression to burn all the high test. Change your plugs and run 85.

Just 87 for my bike I think even 89 is a bit much...

Did'nt know about the octane stuff, all I knew is ran like do-do on regular. But I have have run the high dollar stuff since I found out it would not run worth a flip on the regular with out these problems. How many miles can you get out of a set of plugs? The owners manual says change every 8k but when I changed them at 12k they looked like new with a nice brownish tint to them.

Make sure your enricher is closing completely. There have been issues, where it was necessary to trim little thin donuts off the back of the knob, until you can be sure its closing all the way. Do a sliver at a time, until you can slide a piece of paper between the knob, and the rubber it almost stops against.
Something to look at.

Thanks guys, gonna check the enricher thing out. How can you tell if it is completley off?

Also Curt I value your opion very much so I will change plugs and do as you suggest. Still wondering how many miles before you need to change plugs?

how is your gas milage? if it has gone down check for a intake air leak,you would think that an air leak would cause a leaner conition but if you have an air leak the enrichener will stay open causing poor gas milage and a rich conition

when was the last time you changed the air filter ??

LIGHTNIN wrote:
Did'nt know about the octane stuff, all I knew is ran like do-do on regular. But I have have run the high dollar stuff since I found out it would not run worth a flip on the regular with out these problems. How many miles can you get out of a set of plugs? The owners manual says change every 8k but when I changed them at 12k they looked like new with a nice brownish tint to them.
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1st up,if your stock low comp 07 R* as you put it (" would not run worth a flip on the regular " meaning 87-89 octane fuel then there is something wrong with it.

The low com R* is specifically designed to run on low grade 87 octane fuel and due to its low comp & combustion chamber design running high octane premium fuel actually degrades its perf while also at the same time causing excessive carbon build up in comb chambers /valves/pistons/ex system too.

Its likely a carb fuel calibration/setup issue your experiencing needing to be better dialed in when it comes to PMS/Needle clip setting/maybe even main jet too along with also maybe needing the cold enricher/choke trim mod thats already been suggested too.

As for the plugs,even though your plugs were looking good with 12k miles on std type non plat plugs there was gap errosion and wear on center & grnd strap electordes which is why you need to change them.

I have run std ngk plugs to 8k miles no problem,could go with plat or iridium plugs that can go way more milse then std lugs can but 1st get running issue fixed before paying more money for those plugs.

But with that said i took those same plugs with 8k miles on them & cleaned them in a professional spark plug cleaner ,regaped,and then reistalled & ran them no problem to 15k miles & then installe NGK iridiums.

And post plug cleaning i also took the time clean all cleaning debries out of plugs post cleaning spraying carb cleaner deep into plugs then using 100psi comp air to blow it out so no issue with abrasive getting into cyls.

I have been using that prof plug cleaner for many yrs without ever having an issues as long as you always take a min to ensure you clean out all abrasive debries post plug clean/prior to re-gapping & reinstalling the plugs (use antisieze on threads) post cleaning which is very important to do.

Doing that keeps you out of trouble by keeping cleaning debires from plugs getting into cyls or plugs getting stuck in threads in the heads if not using antisieze.

BTW,Single plat plugs are rated for 60k miles,dbl plat & iridium plugs are rated for 100k+ miles in fuel injected cars ,but in the carb'd R* with less then optimal efficiency it could be a bit less.

But even getting half that in our R* like maybe 50k miles using dbl plat or oridium plugs is a heck of a lot better then getting only 8k miles or even 15k miles with cleaning like i did of std stock type plugs.

Scott