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mknittle
01-10-2010, 09:17 PM
the bike is an 85' I can't find any numbers on the silencer. it is an aluminum 4inch With 6 disks.
The bike runs just a tad rich. I took the end cap and disks off and it runs quite a bit better. how many disks are a good starting point?

kz550
01-11-2010, 01:30 AM
Have you rejetted? Sounds like it. Try 9 or 10 and see how it runs. The answer is dynamic, depending on a lot of factors, jetting, altitude, humidity, air filter, etc. Experiment. You might find 12 is ideal and knowing that it's running rich at 6 diffuser discs means that you should be able to safely add 2 - 3.

mknittle
01-11-2010, 09:58 AM
thanks KZ,
I don't know much about the bike's history as it was givin to me. it runs a lot better uncorked so I know it needs more disks.

kz550
01-12-2010, 12:12 AM
You're welcome. That's another reason why the SuperTrapp is a great choice; you can adjust it to fit your jetting. Then there's the other option. Depending on your jetting, you could lean it out 2%-3%* and leave the diffusers at 6. It's up to you.

* so if your main jet is a 120 divide that by 1.03 to lower it to around 116.5 or 117/118 if you lower it ~2%. That should put the jetting back into its sweet spot if you're looking for better fuel efficiency and a cleaner running motor.