I got my 'combat scrambler' back on the road!

Discussion in 'Airheads' started by supershaft, Oct 17, 2012.

  1. supershaft

    supershaft because I can

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    I was talking with my landlord and realized that I got my friends' bikes mixed up. That was a chipped and piped Hypermotard that just barely out pulled me up a long, steep hill as we were passing some cars, not a Multistrada (before I got my bike running better). I think I am going to take him now. Engine to engine that is. I could already take him otherwise.:wink: At any rate, I am just trying to describe how it's running. Who is running the strongest? That takes a good roll on race through at least a couple of gears IMO. Third gear takes me to around 105mph. Fourth up to around 125. That's enough for me.

    High revs? The more I do to it for 'high revs', the stronger it is on the bottom. It is noticably stronger above 6500rpm and below 4000rpm now but my biggest gains since the last setup is right in the meat of where I ride: from around 4000 to 6500rpm. I have been watching my tach a lot lately and realize even more than before that I almost never ride below 3000rpm. Even though my tuning focuses above that, my sub 3k power is still quite a bit more than stock from idle on up.

    I forgot to mention that I have rode my bike enough now to realize that balancing my rods made a difference. It is noticably smoother now. Thanks robtg. I tried to do it at my shop but I could tell that my quickly set up gizmo wasn't accurate enough. Robtg dialed them in for me. IMO, it is a very subjective operation with a real good setup. Sure, you could claim you get them down a gnat's ass but that all depends on how you breath when you read the scale!
    #41
  2. supershaft

    supershaft because I can

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    I am just about done fine tuning the setup I have now. I am going to try some 160 mains just to make sure I am where it needs to be. I have 165's in it now. Except for the mains, nothing else got changed from before. I don't think I will be reving it as high as I use to. There is no need. The thing has SO much more low and midrange power now. Basically removing the top of my airbox and shortening the stacks really helped mid range and top end. I can still tell that it really needs a freeer breathing exhaust now for more high end power. I won't be surprised if it would help all through the rev range. So far and very differently than before the higher CR and port work, everything I do for the top end helps everywhere. Those 336's are GREAT cams!

    It sounds different now too. Hard on the gas its exhaust note has more of a hum to it.

    For some reason I counted how many tires I have put on this bike. I got it with 28,000 miles but my maintenance records are on a garage post at my last house up until 47,824. Between 47k and now (101,854 miles) I have put 22 tires on that bike and I have only used tires that last me twice as long as others on this bike. For instance, I can squeeze over 3000 miles out of an Avon and I am very lucky to get 2000 out of a Metzeler. And the Avons grip MUCH better! It's a good thing I don't ride bikes for economy! :freaky
    #42
  3. ML WYDELL

    ML WYDELL NED

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    :*sip* Waiting for pictures.
    #43
  4. Airhead Wrangler

    Airhead Wrangler Long timer

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    +1... especially the airbox and these new stacks.:ear
    #44
  5. supershaft

    supershaft because I can

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    I have family stuff to do right now and then hip surgery but I am shooting for early next month to get some pics up. Don't expect too much. I like the looks of it but it is definitely not a looker by most people's standards.
    #45
  6. ML WYDELL

    ML WYDELL NED

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    Come on, do you have time to sleep?
    #46
  7. ME 109

    ME 109 Long timer

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    I could do your hip surgery for you if you like. Cheap.
    I haven't done one before but I wouldn't let that put you off.
    Imagine the bike parts you could buy with the savings!
    #47
  8. supershaft

    supershaft because I can

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    Hip surgery and whatnot went well. I called my friend to show me how to post some pics. Hopefully he will come over in the next week? I have already been riding some. My bike is very consistanly but not always pulling power wheelies from about 35mph I am guessing because I am usually too busy to study the tach in ernest. My airbox mods helped my midrange a lot. My latest mods most definitely got me a lot more power EVERYWHERE. The biggest gains are in the 4k to 7k range. My above 7k power gains aren't nearly as big as the lower rpm gains. I highly suspect it is the exhaust holding it back but we will see here pretty soon I hope. My bigger intake valves and massively hogged out ports and completely hogged out airbox just keeps getting me more and more midrange. I figured that raising my compression, dual plugging and remapping my ignition would mostly get me more low rpm power but I didn't figure on all the hogging out doing the same thing. I chalk a lot of that up to the 336. Despite their high end reputation they are most definitely a midrange cam. Now that my low end performance is SO much stronger, I will put bigger diameter exhaust on and see how that raises my peak torque. If that isn't enough I can always time my cam straight up. Everyone I know says that's good for around 500rpm higher peak torque.

    Pics coming soon I hope!
    #48
  9. Rapid Dog

    Rapid Dog bikes, booze, broads...

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    ...pics of the bike, not the hip surgery please...:augie
    #49
  10. Uncle Pollo

    Uncle Pollo Long timer

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    We need to buy this guy a camera.
    #50
  11. craydds

    craydds Long timer

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    SS is a great mechanic and a wonderful source for instruction for all of us inmates. However, he is "differently abled", or "computer challenged". Just kidding, SS, don't hurt me.
    #51
  12. Uncle Pollo

    Uncle Pollo Long timer

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    Check your sidestand bolt torque value and repent.
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  13. craydds

    craydds Long timer

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    I will soon be starting a Southland Clutch thread. I expect to be soundly chastised.
    #53
  14. supershaft

    supershaft because I can

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    Thanks guys. I swear that my computer wherewithall is about like I am with a camera. I did buy a camera a few years ago. I just for some reason have no inclination to use it! Or much of any desire to post pictures but I will. I am just going to wait and be showed how to do it so it will take a fraction of the time.

    I think my stainless push rod tubes might be weeping at the cylinders. I hope not. I have had just about perfect luck with the stock ones. Those stainless tubes don't fit right IMO. The tube ID is the same but the interference fit is a lot tighter for the tube being a lot thicker and not giving as much as the stock ones. I am keeping my fingers crossed but it doesn't look good at this point.
    #54
  15. supershaft

    supershaft because I can

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    I over revved the crap out of my engine today. I am going to look into a rev limiter. Any experience with any out there on our airheads? I just leaked it down and nothing bent! I think maybe my new valve float rpm is higher than I thought. The black top was damp so I got going around 35 or 40 mph before I rolled into the throttle. The back tire broke loose and that sucker spun up out of sight in a nano second before I had a chance to get back out of the throttle.

    I was hoping to have some photos posted by now but my help has been out of town. Soon I hope!
    #55
  16. ME 109

    ME 109 Long timer

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    Did you pull 9000? Don't go bending that thing (and yesself) again!

    I got to just on 8000 this morning before it stopped making power/breaking down? while out giving my tranny rebuild a try out. No point screwin' about.:wink:
    #56
  17. supershaft

    supershaft because I can

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    The tach tops out a 8k so I don't know. Bending a valve? That I was afraid of! Bending the bike? That's going to take more than spinning up the back tire while in a straight line. I am not that old yet! :D
    #57