Maintenance & Technical > KX500 Original
Wiseco, Wossner, or Pro X Or ???
Larry Wiechman:
There is absolutely nothing wrong with the OEM cast piston.
motorman455:
There are a few std bore wossners on ebay right now
sandblaster:
--- Quote from: big green on March 23, 2017, 12:27:33 AM ---I guess I should also call Tom back and tell him he has no idea what he is talking about and go with another builder.
--- End quote ---
Tom does excellent work and knows what he is talking about.
I'm sure he won't overbuild you motor so that it would blow your piston.
big green:
Thanks larry. Was just clowning around with the resident"guru".Yes i know there is nothing wrong with cast pistons and i have nothing but supreme confidence in tom as his knowledge on the k5 is second to none.
dave916:
On the subject of forged versus cast pistons, it should be understood that there are pros and cons which are well understood by the Motorcycle manufacturers. Cost is not an issue since the difference at high volumes is negligible. No manufacturer would compromise the performance of a racing bike for a small cost reduction. A forged piston is stronger but cannot not be made from the optimum silicon content alloy and this will require a larger clearance which will always compromise its performance. A further advantage of the high silicon content cast piston is its strength at higher temperatures, particularly at the crown of the piston. This allows a higher compression to be run with a cast piston. Of the four Japanese manufacturers, only Kawasaki has used forged pistons in its two strokes and they abandoned the practice 25 years ago. The highest specific power output achieved by a modern mainstream two stroke is the Honda RS125 G.P. Racer. 50 + h.p. - Yes 400 h.p. per litre (more than an F1 car or a Moto GP bike) and this is using a cast piston (the KTM85 is also close to this performance with a cast piston). Why - because this is the only way to achieve the clearances needed to maximise the power output. A forged piston may perform better when working outside the service limits, but this should not be an attraction for a racer.
A COPY AND PASTE fromhttp://www.mitaka.co.uk/
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