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Discussion Starter · #1 ·
The article got the stock compression ratio wrong and no dyno numbers. Still in all glad to see more interest in the XX from the aftermarket.
 

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I also just received the ATV Action July 2010 edition. I was happy to see the article for this in regards to the TRX700XX. I was a bit agrivated when I recently read an article about Matlock Racing winning a race and they talked all about the team and the race, but did not even acknowlege he won on an XX. Anyways...if you read the article it adds up to like over $2000 for all the stuff they did. Just the Thumper parts total up to about $639. I guess this is ok if you're going big! 41cc of extra displacement is expensive! But on the good side, no new sleeve or case machining is required.
 

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Discussion Starter · #5 · (Edited)
How did they come up with the extra cc's?
a 105mm piston.

Thumpers website listed the stock compression as 12:1 with their CP piston at 12.5:1, a stage 3 Hot Cam, PC5 and FMF Q4 with power bomb header rounded out the articles build.
 

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Thats not 730 lol.
105mm is 727 and 105.5 is 734. I was thinkin they may have done some oddball 105.25mm piston or something.
 

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yea i also read the article and thouht that stock compression was around 10.5 maybe i'm wrong!?!?! Sounds sweet but a little to rich for my blood/
 

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Handy chart for everyone on the most common combinations


I too, hate that these bigbores are called "700"s. 686 is just as "cool" sounding as 700.....
anyone up for a 941!?
 

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On the 700 Raptor the +8 crank fits right in the cases without modding and 105.5 bore as well. Thats why the 797/804 builds are so popular, the 771/777 is popular because of the price of the +5 Hotrods crank.
 

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i wonder whats the biggest crank u can put in the xx without modin the case
 
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