performance

  1. A

    Maybe a good alternative muffler, with a close to stock look.

    In BMW airhead circles, "Hoske" mufflers has been a highly regarded modification since the 70s. And they happen to look very similar to the stock mufflers on my 1977 D-model. They come in 2 sizes, for 38 and 40 mm OD headpipes. So no need for unsightly adapters etc. And being designed for...
  2. A

    Is the Royal Enfield becoming the new XS? S&S offer performance parts already.

    The RE 650 has been getting pretty positive reviews, even if the performance numbers are not much better than an XS. But the aftermarket has responded pretty quickly to the RE. S&S are now offering hi-comp pistons, big bore kits, Power Commanders, exhausts and camshafts for the RE. That is...
  3. TwoManyXS1Bs

    The "A" Factor

    Just another cabin fever diversion. The scenario is simple. You're emerging from a mild cruise toodle in a metro area, to the open highway. Or, you're wanting to pass around a slow truck. And, stay in 5th gear. What kind of acceleration can be expected when throttling up from about 45mph to...
  4. 1973 TX650 Chopper

    Am I running lean on new Mikuni VM TC Bros carbs?

    I'm a newb and I've learned a lot already on this forum and am really grateful. My 1973 TX650 is nearly finished as I just completed a pamco ignition upgrade along with new Mikuni VM roundslide 34mm performance carb kit by TC Bros. I have the bike running and have driven it a few times. I've set...
  5. D

    Help with tx650 engine parts!?

    Hey everybody, Im working on rebuilding a 1973 tx650 engine and it seems most of the stuff I find says tx or xs and others are tx/xs. Im wondering what exactly is cross compatible. Mainly talking about engine seals and gaskets. but would be good to know about pistons and rings. they seems to be...
  6. ExtraRegularGuy

    Torque plate

    Getting ready to hone my cylinders. Just wondering if anyone has made , seen, or used a torque plate for their cylinders?
  7. ExtraRegularGuy

    stock bore size and a shell #1

    Im sure it isnt a uncommon thing, i just cant find any video of people with a stock bore size XS and a shell#1. I see mostly 700s and 750s that are cammed. Im just trying to get a feel on how rowdy a stock bore XS with 250 /250 on 100 will act. Thoughts?
  8. Brencarp

    Performance - More Power AND Higher Top End??

    Hey guys, I'm looking for information on sprockets. I'm running everything stock now but I want to get some more top end speed from the bike without tuning the motor much. What are the recommendations on this? Anything specific anyone would suggest? Thanks!
  9. Screaming Meemie

    Jet it... And forget it?

    Hey guys, jetting/elevation question here. Bought the bike in MN (elev.950ft) all stock, ran great (which I later couldn't believe due to the rotten air filters, oil filters, sparkies...etc). I hit 102 speedo-indicated mph with stock gearing. Didn't check the tach at that time, but I'm sure it...
  10. plattey

    What does a stock xs650 do in the quarter?

    The car club that I am active in went to TriStates raceway this past weekend and I ran the old xs there. I have done the following to the engine: stock xs650 pistons and rings mild port n polish vm34's torque cones made from stock xs pipes 1 3/4" wrapped street pipes from hoosracing (end just...
  11. 650performance

    High performance XS650 engine with CR500 rods

    Here's some great info for anyone contemplating building a long rod engine. This one uses CR500 rods, but Michael Morse suggests that the KX500 rods may also be suitable (with appropriate modifications, of course). Check it out. Craig The quest for the ultimate XS 750 dirt track engine...
  12. 270YAM

    Harry Lilli replica CNC head

    Who's got one? Has anyone had any experience with these heads? are they as good as they claim? Worth the money?
  13. S

    Any BigBore/Rephase kits for 1972 306 engines?

    Is there nothing out there performance wise for my 1972 306??? Are 256 and 306 pretty interchangable? Why no Mikes bigbore for me damn it!!
  14. ReycleBill

    The Best Pipes I've Tried

    When I bought my '83 Heritage Special it came with a brand new 2-1 header as installed by the previous owner. It was loud, sounded more like a 4 cylinder than a twin, short on power, hated to be cold and made an awful droning noise at 50-60 MPH that drove me insane. Being I have several other...
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