Maintenance & Technical > KX500 Original
Wiseco, Wossner, or Pro X Or ???
alward25:
Big Green,
If Vertex made a piston for the K5, I would run it in stock to mild engines until it gave me a reason not to. So, with that being said, what oil u running:)
big green:
:lol:
umberto:
--- Quote from: big green on March 26, 2017, 09:57:35 AM ---
--- Quote from: alward25 on March 25, 2017, 02:19:31 PM ---All good discussion, however, I have never had a Forged piston shatter. I have had more problems with cast, namely Pro-X and a few OEM shattering the skirt, not holding the the alignment pin for the ring and letting it bounce around the engine, or straight up exploding. All of them in not very remarkable engines. After having a bunch of Wiseco piston and ring problems and crappy customer service, not going there if I don't have to. So, I run only Wossner by process of elimination and I feel they spend more time on the finished product than the other guys. My 2 cents while we are throwing opinions out there.
Bike companies also put in the most eco friendly parts they can so they can turn a profit and the parts are sure to last as long as you keep to the schedule they have established. They are not the best available and there is an overly high opinion in this industry that OEM is the only way to go. There are a few parts that are made that OEM is a better option. This is not always the case and to blindly boast " I run only OEM parts", tells me you run the bare minimum to get by for quality and overpay for packaging in many cases.
--- End quote ---
I could not agree more. However the only time I have ever had a ring pin issue was when I ran wiseco pistons in a snowmobile engine along with another friend. We used to do a lot of grudge racing. Unfortunately piston threads usually turn into the same thing as what oil is best thread or mineral vs synthetic.... I honestly regret even commenting in the first place. I am however extremely grateful for much of the knowledge gained on this site. My original reply to the first post was simply that I would not wait for brand "x" piston as I have had great luck with other pistons and not so good with others. I am not here to wield my almighty knowledge sword just share some experiences. Those that prefer forged should continue to run them and those that prefer cast should do the same but to somehow suggest that a certain racers bike would basically self destruct if it didn't have a forged piston is just ridiculous but again that is my opinion and i have realized I should keep those to my self. I will continue to frequent the forum as my love for the kx 500 is as strong as any other here but will keep my posting to a minimum when it comes to opinion based topics.
Cheers!
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Please keep expressing your opinions. This site is all about people expressing their love for KXs and sharing experiences and knowledge. I came from the hot rod world and was biased towards forged pistons, so this was very interesting to read for me and most importantly I learned something.
sandblaster:
--- Quote from: mun on March 26, 2017, 09:27:23 AM ---Hi sandblaster.
Do you know what RPM is a peak power at short exhaust pipe? Approximately.
--- End quote ---
I built Jeff a Crank and a top end.
He assembled the parts and raced it.
I have heard rumors but I'm not allowed say.
I will tell you that there are some that have ran their Wossner K5 cranks and pistons over 12k... with no apparent damage :-o
mun:
--- Quote from: sandblaster on March 26, 2017, 02:49:11 PM ---I built Jeff a Crank and a top end.
He assembled the parts and raced it.
I have heard rumors but I'm not allowed say.
I will tell you that there are some that have ran their Wossner K5 cranks and pistons over 12k... with no apparent damage :-o
--- End quote ---
Thanks.
More than 12k is a hell of a lot of 86-mm stroke.
Prior to secure piston speed was approx. 8500> 24.4 m/s 79.9 ft/sec.
12000> 34.4 m/s, 112.9 ft/sec.
http://www.csgnetwork.com/pistonspeedcalc.html
Now I understand the shortness of the exhaust pipe. More than 12k can be obtained from the motor over 100 hp easily.
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