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Discussion Starter · #1 ·
i have recently been looking to bore my 400 out but i cant decide 416 or 426 cause i race flattrack and tt and i put a stage 2 hotcam in it which gave it quite a bit of power but i need a little more and i was thinking the 426 would be good but i dont want it 2 overheat or have to get better valves cause i still trail ride just wondering if anybody has had one and liked it or had troubles thanks
 

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not a lot of differance in the two go with the bigger if you are going that route
 

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69 is right, theres not alot of difference.
but i have run both setups in the past and the 416 kits stayed alot cooler when pushed in a race
just my $0.02
 

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I have the 416cc87mm and i have no complaints i bought it this way so i dont have anything to compare it to other then its way faster then my 300 ex was!
 
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