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jet kit required?

Discussion in 'Technical and Troubleshooting Torque' started by deafwish, Jul 16, 2005.

  1. If i were to put a Staintune slip on muffler to a perfectly standard Honda Hornet 600, would i need to rejet the carbies?
    I had a Staintune on my VTR250 and it ran perfectly with standard jetting.
    Is it an expensive process to re-jet a bike?
    Daz. :wink:

  2. depends how much different the back preasure is with the new endcan... you might just get away with twicking the carbs... or not doing any thing at all...
  3. deaf, I put one on my VFR750 and it didn't require any changes. I have also been told by my mechanic that even if I took the baffle out (which I don't want to do), it would still be OK.
  4. you can probably just tweak the carby mixture a bit if its not right.. or even shim
    the needles and change main jets, but you're best to do a few dyno runs in between
    so you get the right mixtures...

    otherwise, a jet kit will cost you under $200 + the cost of a dyno run if you do it yourself.
    its a pretty easy job - a few hours first time
  5. Emphasis being on the "if it's not right" bit... chances are it will be.

    At $60 a pop, dyno runs are not exactly a basic diagnostic tool. If anything, Def would probably be best serve by just bunging the pipe on and reporting back here.
  6. I reckon stay away from the kits. I've herd so many bad things and them not being right.

    As far as rejetting goes, I reckon you will definatly need it.

    It is model specific, but generally standard bikes are a little lean at the top end and a little rich down low.

    A pipe exagerates this.

    From reading bits and pieces about what people have done it tends to end up something like, 2 sizes bigger on the main jets, 2 sizes smaller on the pilots and one notch higher on the needle.

    At least this is a good starting point.

    But, as I noted, it is model specific. Honda may have a "rich running" policy and so a pipe may make it just right.