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Kawasaki MX & Off-Road Dirt Bikes
2T Engine experts -> your opinions on top end rebuilds
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[QUOTE="NM_KDX200, post: 1223366, member: 38052"] As noted, 2S top end jobs are mostly preventative. Even on my 125's, I've yet to see one that was close to the service limit. For a 125, in "play racing mode" this is about 6 mos (20-25 h) for me. For a 250 MX'er, every year. On a KDX200, every 2 years was fine. On all of these bikes, I'm cleaning the powervalve at this time and it usually needs more attention than the piston/rings. Since a piston/ring/wrist pin set is around $100 and it takes me about 3 hr to do a top end, it's fairly reasonable insurance to just pop a new piston/ring in there. Sure, you could do just the ring (and I do, sometimes), but a single ring is still $25 or so, and a double 250 ring is $35, so I'd just soon go ahead and do the piston, too. I have 32 h on my YZ450F and it feels like it's just now loosening up. Valves haven't budged. When the valves start moving, I'll replace them. Again, cheap insurance compared to a new 4S top-end. [/QUOTE]
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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
2T Engine experts -> your opinions on top end rebuilds
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