Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)
Bad experience with Wossner pistons...
RoostDaddy:
I dont think its a Wossner problem. Yes it sucks, but I have had it happen on Wiseco and Pro-X pistons too. This is always one of the places I inspect on a piston before putting into a bike. (use a small punch and give them a tap to make sure they are seated) not a guarantee but a good precaution.
kwakman:
can you be more specific Roost, what are you punching with the tap? K.
scratch that, you mean loc pin.K.
kwakman:
the hungry tdr made a mess, we think, due to Wossner stating that the thermal expansion of their pistons is reduced enabling a tighter piston to bore clearance.locked up 2 sets. when run at an increased clearance, (but still a smidge tighter than the Wiseco) she runs good.K.
cbxracer30:
This is what they are going to tell you "The pin fell out do to a too lean condition , send us the piston and we will perform a rockwell hardness test on it this will tell if the piston was run hot for a long period" . I have already been done this road with wiseco and it never went anywhere. Good luck! CBX
81cr450:
Manufacturers wont cover incidentals, period, even if you do get them to own a defect. I'm doing a trx650 rincon topend right now & didnt want to hear of these problems, but I guess atleast with the 4 stroke no locating pin. Glad to hear some on the tighter fitment spec kwakman, I'll make sure they give her a little more clearance. Anybody tried Namura?
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