Maintenance & Technical > KX500 Original
Mainjet adjuster? Doordie please explain
demographic:
--- Quote from: doordie ---3)Piston port it?s good for lubricate small bearings and to COOL pistontop(more power for long straights) and make piston a little bit lighter.(A Wisecopiston and a stock modified pistonpin make a huge different,oops a tuning secret). :shock:
--- End quote ---
I knew from THIS thread that Wiseco KX 500 pistons are 30 grams lighter than the stock pistons which seemed to me to be a significant amount on a reciprocating part.
doordie:
demographic,
Yes, you can see a big difference about weights between stock and Wiseco. :wink:
This is a post from another forum (ATM):
Standard: (Wiseco in brackets)
All in = 489g (471g) Wiseco 18g lighter.
Pin = 80g (86g) Wiseco 6g heavier.
Rings = 14g (18g) Wiseco 4g heavier.
Piston = 395g (367g) Wiseco 30g lighter.
I use the best from this worlds! :twisted:
//doordie
demographic:
--- Quote from: doordie ---demographic,
Yes, you can see a big difference about weights between stock and Wiseco. :wink:
This is a post from another forum (ATM):
Standard: (Wiseco in brackets)
All in = 489g (471g) Wiseco 18g lighter.
Pin = 80g (86g) Wiseco 6g heavier.
Rings = 14g (18g) Wiseco 4g heavier.
Piston = 395g (367g) Wiseco 30g lighter.
I use the best from this worlds! :twisted:
//doordie
--- End quote ---
Would that be a Wiseco piston, standard gudgeon pin, and standard rings then?
I am guessing that the standard gudgeon pin is thinner than the Wiseco one, am I right?
Johnniespeed:
Wow, I havent heard the words "grudgeon pin" in thirty years, I used to be an MG mechanic. Thanks for the trip down memorylane. The words "sparking plug" "boot""bonnet" and "gaiters" just came back to mind also.
Back to the reciprotating weight thing, is it possible to reduce the reciprotating weight to the point of the crankshaft assembly being off balance? I know when having car engines balanced, the reciprotating weight was figured into a percentage and bob weights were added to compensate. then the crank was spun and balanced. Is that how a one cylinder is done?
demographic:
--- Quote from: Johnniespeed ---Wow, I havent heard the words "grudgeon pin" in thirty years, I used to be an MG mechanic. Thanks for the trip down memorylane. The words "sparking plug" "boot""bonnet" and "gaiters" just came back to mind also.
Back to the reciprotating weight thing, is it possible to reduce the reciprotating weight to the point of the crankshaft assembly being off balance? I know when having car engines balanced, the reciprotating weight was figured into a percentage and bob weights were added to compensate. then the crank was spun and balanced. Is that how a one cylinder is done?
--- End quote ---
I am English and over here we still use words like Gudgeon pin, Boot and Bonnet and the only Gaiters I know of are the bits that cover the fork stanchion chrome on right way up forks and the ones that walkers wear at the bottom of their trousers and go over their boots, same thing?
I would have thought that to balance out the piston weight loss you would have to drill out some of the crank web? maybe?
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