Porting a used HT bad idea?

Discussion in 'Performance Mods' started by Fletch, May 6, 2012.

  1. Fletch

    Fletch Member

    My engine has maybe 2,000 miles on it (odo was reset) and I'm wondering if I should bother porting it?

    Does it already have too many miles to make it worth it?

  2. Purple Haze

    Purple Haze Active Member

    Congrats on getting that much mileage out of it without tearing it apart! I'd say keep riding till you have to take it apart to fix something, then port it. These China dolls have lots of casting flash in the ports, and will breathe much better with some cleanup. But, I wouldn't take it apart if it's still running well, you'll have to buy gaskets and probably new rings and bearings and seals. A better plan would be to save your money and buy a new engine, then you can mod the **** out of it while riding your old engine to death, then swap engines when your old one craps out.
  3. Fletch

    Fletch Member

    I actually did tear it apart originally to mill the head a bit, and clean and enlarge the ports slightly as well as smooth the casting like you mentioned. I didn't port for performance though.

    I've been talking with Fabian and he recommends just getting a reed valve. To be honest I'm pretty over all the work on these bikes. I have a shift kit and expansion chamber, mikuni carb, etc. So going through 3 bikes and 4 engines now I think I'm worn out!

    2 engines I ported were monsters compared to stock but the cylinder jammed around 900 miles of full throttle on both of them. Although I'm almost positive that it was because I added more oil to the mix both times and leaned the mixture out too much. With an NT carb and stock exhaust that wouldn't probably do it, but with a fine tuned mikuni with pilot jet and expansion chamber I'm certain it did.

    I also had no shift kit on those ports so rpms were constantly insanely high and I didn't have the extra speed that comes with gears. I can't even imagine the beast that this bike would be with a ported engine and shift kit. It might actually be too much torque for it.
  4. HeadSmess

    HeadSmess Well-Known Member

    go for it, but if you rely on it, have a spare one on the shelf...