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Thread: NRHS Stage 2 for 07 XB12R

  1. #71
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    Quote Originally Posted by cvc View Post
    What primary is that? And do the do multiple ratios?
    Evolution industries billet clutch assembly and engine sprocket. As far as ratios go, they make engine sprockets with many different tooth counts. You can go up or down one tooth on the engine sprocket and still use the stock primary chain.

  2. #72
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    Quote Originally Posted by mike lowary View Post
    Yes the ignition timing maps were changed. The stock and race timing maps are ok up to a certain point. What’s your compression ratio now? Did you get the 30 degree reverse dome pistons?
    I am running the stock timing map right now. Looking through old posts it looks like I played around with timing about 10 years ago, wasn't satisfied with any changes I made or the race timing maps, and went back to stock. I have the 30 degree reverse dome pistons with a target compression ratio of 10.5:1. I have never actually measured it.

  3. #73
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    Quote Originally Posted by lawdog View Post
    I am running the stock timing map right now. Looking through old posts it looks like I played around with timing about 10 years ago, wasn't satisfied with any changes I made or the race timing maps, and went back to stock. I have the 30 degree reverse dome pistons with a target compression ratio of 10.5:1. I have never actually measured it.
    Several factors come into play with this. Raising compression, 30 degree combustion chamber, and getting the squish band dialed in. All of these things require less timing to make power. Especially the 30 degree chambers and squish band. The 10.5:1 compression isn’t really high enough to make such a difference. In my case it would because I’m at almost 12:1. I could whip you up a better base timing map if you like. Let me know. What year is your 12?

  4. #74
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    2009 XB12R with BUEZD

  5. #75
    Senior Member outthere's Avatar
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    I do like that primary set-up. The Norton could have used something like that.

    Running open-loop still lets the ECM correct for lean conditions. I seem to help bottom power more than anything. The bike pulls a well-running open loop.

    That is Force/Drummer combination. It Fits Dean's muffler also but it's in a bit of a bind so I'll give this a go this year.222964-1000x667norton.jpg

  6. #76
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    Quote Originally Posted by outthere View Post
    Running open-loop still lets the ECM correct for lean conditions. I seem to help bottom power more than anything. The bike pulls a well-running open loop.222964-1000x667norton.jpg
    Actually, in open loop the ECM will not correct for a lean or rich condition. However, the O2 sensor can still be active to inform you about sensed lean condition with a CEL. That way you can do something to fix the problem instead of having the ECM try to compensate for it without you knowing.

  7. #77
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    ^^^^^always learning



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