Hyper 7 Rally Cross ENGINE UPGRADES

[trinbagonet]

HI there,
I have lots of questions I am new to all this so forgive me but..

The hyper 7 rally cross comes with a .21 engine would it be possibe to just put in a .28 or maybe a .32 big bore engine into it.
Will I have to change any else after I put the new engine in??

also what would be the best fuel to put into it.. I currently have a can of 16% is that ok??

[psunitro]

yes, a .28 will fit, a .32 MAY need a mod or 2, depending on what it is.
16% is OK, but when you run out, get at least 20%, big blocks like higher nitro content. It will run better, cooler, and have more power.You will have to re-tune for a different nitro%

[trinbagonet]

I was told
that the stock 3 ports is more than adequate. A .28 or .32 is lower revving, so won't go as fast. is this true??

[psunitro]

UMMM, no.
Gearing plays a huge part in moving the powerband of a mill. As does the pipe choice. NOTHING wrong with the stock 3 port mill, but a stock Force .28 will have more power than the .21 Force mill.
"FAST" is relitive.who cares if top speed is a little more with one mill, when the other will get to its top speed quicker?
For me, if you want to upgrade, I would find a cheap stock Mac/Force .28, get a decent pipe,get a bigger clutch bell, and call it a day.