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  #1  
Old 09-13-2005, 10:23 PM
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Default Size D piston in size C cyclinder?

     

I am planning on rebuilding my topend this winter.I have found a good deal on a total rebuild kit. The only thing is is the piston is a size D and the guy say that the D piston will work with A B C and D cyclinders .my bike has what I beleve is a size C cyclinder.I cant realy find any where on the cyclinder where it say what size it is but on the back of the cyclinder is has 1C6C(or 0 it's kinda hard to make out)9145 printed in ink.does this number tell what size the cyclinder is?My dealer says that there should just be one letter printed on it in ink. anyway, can I use the D piston in my cyclinder like the guy say?
Thanks in advance.
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Old 09-14-2005, 07:24 AM
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Default Re: Size D piston in size C cyclinder?

find out what barrell you have,we used an A piston in a B barrel and the piston shaterd in our 250.
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Old 09-14-2005, 08:10 AM
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Default Re: Size D piston in size C cyclinder?

I believe the d is bigger than a c. I used a C in a B cylinder after my cylinder had worn alittle. I think it should be ok. Although call Jackson Performance in Moline Illinois. You will have to look up his number on Google. But he knows everything it seems like./
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Old 09-14-2005, 08:39 AM
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Default Re: Size D piston in size C cyclinder?

Thanks for you help. I think I will just play it safe and spend a little extra money and get the correct size piston.
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Old 09-14-2005, 09:58 AM
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Default Re: Size D piston in size C cyclinder?

From Eric Gorr

Letter Designations on Cylinders and Pistons

The Japanese manufacturers use a letter designation system for plated cylinders. They intend for you to order replacement pistons based on the letter designation printed or stamped on the cylinder. This is the reason why they need this type of system. In mass production you can't guaranty that all parts will be exactly the same size. The size variance is based on an acceptable level of quality. Tool bits become dull, temperatures of machine tools change through production runs, and machine operators have inconsistent performance. The Japanese manufacturers have between two to four different sized pistons and cylinders. Normally labeled A, B, C, and D. If they only had one size, the piston to cylinder wall clearance would vary between .001 to .006 inches. In the standard Japanese alpha labeling system, A denotes the smallest bore or piston size and every letter after that is slightly larger, usually in increments of .0015 inches. The danger is that if you try to put a D piston in an A cylinder the piston to cylinder wall clearance will be so tight that a seizure might occur.
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Old 09-14-2005, 10:15 AM
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Default Re: Size D piston in size C cyclinder?

Quote:
Originally Posted by ProAMA725
I believe the d is bigger than a c.
Good, now your ready to go BRA shopping for your wife.
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Old 09-14-2005, 10:42 AM
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Default Re: Size D piston in size C cyclinder?

In my old KX I ran a one size larger piston to account for cylinder wear, worked great. I'd strongly recomend mic'ing your cylinder to find out exactly what size it is then buy whatever piston fits the best (the manual will have a piston to cylinder clearance spec range, I like mine on the tight end of the range)
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