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Discussion Starter · #1 ·
While looking for second hand silencers I have found these modified originals that I have bought. They have emptied them and made a db killer that I have increased the diameter of the final hole a little and I have managed to make it sound more or less the way I like it. I have only taken the bike for one day to test it and it seems to be going well. Virtually no backfire when reducing. Has anyone tried this and can give me feedback after using the bike for a while without reprogramming? Any problem with the engine?

Again sorry for my english...

Regards
 

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2011 XR1200x
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Thanks Derek. I would like to know that I am not doing anything bad for the engine
Hello,
Well I’m mostly an old school guy who is used to tuning with a carburetor. Read the spark plugs to see if they are the correct colour first. You can look this up in a shop manual or the internet.They should be a nice toasty brown. To tune a ECM with a computer I cannot do. Their are self tuning ECM’s such as Thundermax (expensive) but search around on this forum. There’s lots of experience here.
 

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2011 XR1200x
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88 Posts
Hello,
Well I’m mostly an old school guy who is used to tuning with a carburetor. Read the spark plugs to see if they are the correct colour first. You can look this up in a shop manual or the internet.They should be a nice toasty brown. To tune a ECM with a computer I cannot do. You can take it to a specialist with a dyno in his garage for a correct reading. Their are self tuning ECM’s such as Thundermax (expensive) but search around on this forum first. They can advise on what ECM is good and what is available. There’s lots of experience out here.
Oh one more thing,
an engine which is is running too rich ( black sooty plugs) is a better problem than an engine is running too lean ( whitish plugs, can lead to engine damage) Harley’s from what I understand are sold when new on the lean side in the tuning department. When you get a more free breathing exhaust & air filter, the fuel system has to be richened up a bit. That’s where tuning experience comes in. Good luck with your bike. It’s a nice nice one.
 

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Discussion Starter · #7 ·
Oh one more thing,
an engine which is is running too rich ( black sooty plugs) is a better problem than an engine is running too lean ( whitish plugs, can lead to engine damage) Harley’s from what I understand are sold when new on the lean side in the tuning department. When you get a more free breathing exhaust & air filter, the fuel system has to be richened up a bit. That’s where tuning experience comes in. Good luck with your bike. It’s a nice nice one.
Thank's Derek. I will check it
 
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