Hey everyone, I am getting spark knock from my 09 Superglide Custom. I have noticed it since I bought the bike. I asked the dealer what I can do and they said put a race tuner on it. I wasn't happy with the dealer I bought the bike from so I bought my wife's bike from a different dealer and had my Vance and Hines BSS and race tuner installed at that same dealer. Spent a lot of money as you can imagine and the spark knock is just as bad if not worse. Seems to be worse when it's hot.

Is it normal to have spark knock? Last bike I had that had spark knock pre-ignited. Should I bring it back and have them look at it? We live in Colorado and with the altitude, I have heard it can be an issue. I have been told the gas here is not as good as lower elevations. Just doesn't seem like that many other riders around here are having this problem.

Should I bring it back to the dealer and have them put the tuner back on?

Thanks!

 

Being still under warranty, I'd sure take it back to them and have them make it right. I'm a bit foggy with your terminology "spark knock". My brain wants to equate it to "pinging" or "pre-ignition" (I can get my brain wrapped around these). If we're talking about the same thing, I'd first try experimenting with different brands of gas and/or octane booster (maybe even some 110LL from a nearby airfield), then a colder sparkplug, finally some kind of tuning gadget; SERT, PC-V, etc.

 

What is "spark knock"?

 

http://www.aa1car.com/library/spark_knock.htm

 

No, it's not normal.
So, you probably need to give more details on exactly what conditions your riding in that is causing this "spark knock".

Give as many details as possible to describe exactly what is going on, and what your doing at the time, like what gear your in, load on bike, etc.

Some pretty smart guys here if given enough information.

 

Thanks for the info. Now I think the old 96 Dakota work truck has spark knock.

 

Mine knocks a little under 1 condition. I am cruising at low rpm and twist full throttle when it is very hot out (90+ deg.) without downshifting. Anyways it is very common for riders to ride at too low rpm with the six speed. This can cause the problems you speak of when you get on the throttle. Roll the throttle more gently, or downshift so you don't put too much stress on the motor at low rpm's.

 

Being at higher altitude, you're going to be running just a bit leaner than if you were at sea level. Find the highest octane pump gas you can find, keep your rpms up, and make sure you are running synthetic oil.

Maybe a set XIEDs along with the tuner will be your answer. Your mileage will suffer, but better mileage than a piston top.

 

I don't think that is correct.

 

Well theoretically, the ECM should be able to remove timing to keep it from knocking, but the bike will have much less power, because less fuel.... no..... wait..... higher altitude will use a bit more fuel, (less power and worse mileage).

Rounder thanks for making think about that again