Greetings, and welcome, fourboy!
Your question begs a little clarification: are the lines breaking at the flying lines, or are the bridles (the lines attached to the sail) breaking?
New flying lines are a pretty simple process, and if your kite's a 4-meter, I would suggest a good line like Spectra Gold at about 300-pound breaking
strength.
If, however, your bridle lines are breaking, that's a problem on a couple of fronts:
1. Your kite is probably old enough that if you replace the bridles, the sail will blow out. When bridle lines are the weakest point, and you
strengthen them, the next weakest point will soon manifest itself.
2. Re-bridling is almost an art form, and requires a "jig" for setting up the different lengths at the A, B, C, (and sometimes D) line attachments.
Get these measurements wrong, and the kite will be virtually un-flyable, as the angle of attack, curvature of the wing, and inflation characteristics
will all be changed. I leave this sort of work to an expert, and pay a good kite repair guy to do it for me.
3. What's the kite worth? The labor costs to re-bridle a high-end, fairly new kite make some sense. An old, faded, stretched-out sail is not worth
rebridling... you could buy a good used or new kite to replace it for much less money.
Anyway, that's my $0.07, adjusted for inflation. I'm sure some of the more experienced in the kite biz could add to these remarks. Corey-lama...
what say ye?
-Dooley :moon:
Mike \"Lack-O-Slack\" Dooley
\"Nothing is foolproof, to a sufficiently talented fool!\"