400ex Highest Compression Pump gas?
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400ex Highest Compression Pump gas?
I was reading at exriders.com that a 11:1 piston is acually less then that. This is a quote from exriders.com from mickey dunlap "Right now the piston is about .043 too low and you are not getting a true compression ratio as advertised by most piston companies. For instance, a 440 11:1 flat top piston advertised is really only about 9.75:1 if you measured the volume correctly." If this is true counld'nt you run a 12.5:1 compression on pump gas sinse it will only be about 11.5:1?
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400ex Highest Compression Pump gas?
I too read that article on exrider.com. I would believe that the advertised compression is much less than 11:1. From everything else I have read to stay reliable with the 400EX you don't want to go over 11:1. So I would go with the 11:1 kit over the 12.5:1. In fact, I am planning on going with the 440 11:1 kit and Hotcam next month. Good luck!!
#7
400ex Highest Compression Pump gas?
Let me know how the 440 kit is and what stage cam are you going with? i have the stage 2 hotcam which i hear is awsome with the 440 kit. also are you upgradeing your carb? i plan on upgradeing to the 440 kit next winter. i was thinking of getting the edelbrock 440 carb but i havent heard much about it wheather it is good or bad.
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#8
400ex Highest Compression Pump gas?
Originally posted by: BartlettRacing
11:1 is the highest you should go ....
11:1 is the highest you should go ....
#10
400ex Highest Compression Pump gas?
I wanted to stick with just pump gas because i dont have the time or money to be running around getting race fuel. But does JE offer a 440 kit or is it only the 415cc i saw on some website. IF someone could give me a link to the JE site and if they offer a 440 kit it would help a lot.
thanks
thanks