290 vs 270 big bore?

clayboy92
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clayboy92
Edited Date/Time 10/8/2013 1:03pm
Which big bore would be best if you are going with cams and head work also?
I have a 2011rmz250 I am thinking about putting one on.
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Paw Paw 271
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Paw Paw 271 9/23/2013 7:17pm
9/23/2013 7:17pm
I have not had it done on your make of bike, but I did have a couple of them done on Yamahas. I enjoyed the 262 Ice Cube kits from RPM. They include a completely new redesigned cylinder with extra cooling. They have worked great. Much more bottom end power with extra pull up the rpm range. I also did their 315 kit. It was great will huge power increase, but the trans would not handle it.
moto314
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moto314 9/24/2013 10:32am
9/24/2013 10:32am
A 290cc big bore only? Never seen one that big. I have tried a 283cc big bore 250F and thought is was way to torquey and felt flat on top, went back to a 276cc. I had a 276cc Ice Cube on my 2007 RM-Z250 and loved it, also had Cams, head mods, and custom piston. Got lots of looks too!
moto314
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moto314 9/24/2013 10:35am
9/24/2013 10:35am
Here is a picture of the big bore cylinder:
clayboy92
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clayboy92 9/27/2013 6:46am
9/27/2013 6:46am
did you not use the piston that came with the ice cube? if not what did you use?

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ktmpartsdirect.com 10/8/2013 1:03pm
10/8/2013 1:03pm
I can tell you that the the 270cc will work very good and pretty much keeps the stock power curve just stronger everywhere, the 290 will need cams and head work to make is rev like the stock motor does as the large piston really hurts the revs.Here is a big bore review also

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