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Discussion Starter · #1 ·
so i want to put a big bore kit on my 2005 crf70, is it true any crf50 kit will work, even if i keep the stock head, which kit is better for the crf70 with stock head, i'm on a tight budget so any help would be heplful, thanks
 

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Well first off just any crf50 kit will not work because the 70 head has a much larger dome so the crf50 piston will make you lose compression and I wouldn't get the tb race head kit because the 70 head is almost just as good as their "race head". If you are keeping the stock 70 head you need a crf70 specific kit but if you do deceide to buy a full kit with head and all the 50 kits will work
 
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