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Old March 19th, 2013, 01:11 PM   #7
mgentz
Board Member
 
Name: ...
Location: WI
Join Date: Dec 2011

Motorcycle(s): 250R (street), 250R (dirt)

Posts: A lot.
Quote:
Originally Posted by psych0hans View Post
You're a noob... You should just get a bigger bike... you're just wasting your money... You have no Idea what you're doing... You're going to kill yourself... Why don't you wedge a ninja 1000 motor in there instead? The Ninja wasn't meant to handle so much power...


Now that that's said and done with... Really looking forward to this I wonder how much hp you can get after these upgrades... Also, how reliable will all these parts be? Considering getting bigger throttle bodies? i.e. those off the Ninja 300... Good luck!!!
thanks.

I will be dynoing the bike after the initial break in. I am taking an educated guess on fueling and using the stock ignition map initially. After break in, these will change. @RacerX has been very helpful with ignition ideas, and I got the jettingpro to play with.

As for reliability, these should be just as if not more reliable than stock. the compression is only ~1 point higher and I'm staying with NA. The motor (valve springs, seats, crank, etc.) has been updated and will be religiously checked along the build to ensure proper clearances. @tubarney and I have already discussed the need to leave the rod bearings at the loose end of the tolerances to allow for extra oil. Again, adding reliability.

As for fueling, I have decided to keep the carbs stock sized for now. I don't think the CR carbs are as good in the low-mid range and I would like to keep the throttle response clean and crisp. FI is out due to cost and weight. Besides, a well tuned carb beats FI...just ask the dirtbike folks or car engine builders. That being said....there is always room for improvement and I may try some things later. @tubarney has CR carbs and he can let us know his thoughts.
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