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Discussion Starter #1
What is the max bore you can get out of the Z? The Thumper 470 kit is a 97mm bore. I was wondering what the max was.

llknowlesll
 

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I think that must be as big as you can go, cause I think the 500 kit uses the same bore and just a longer stroke
 

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Discussion Starter #3
Which 500 kit?

llknowlesll
 

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the FST 500 kit...
 

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Yes,,the FST kit is the same 97mm bore (piston) but a stroked crank. They told me that all I had to do now is send them my crank to be stroked and use there piston and I'll have a 500. :wink:
 

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You will have a 500 with potentail for alot of reliability problems.
 

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Discussion Starter #8
Do the 470 kits have a lot of problems?

llknowlesll
 

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I think TC has a 500 kit also cause at FST they build there motors to have tons of torque and alot of reliability . If I were u dont get the 500kit from FST unless your a GNCC racer but if u want alot of power go to another engine builder.
 
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