290 athena big bore or mpfab turbo?

Just trying to get a feeler and opinions going on what you guys think about a big bore kit or turbo, which would you go with and why??? Im doing one or the other on my 2014 after break in just cant decide which....HELP!!!!

I see you have the WRR version....so if you plan on any dirt use at all, then the Turbo option is not a very suitable idea. ( Due to the intake air pick up, which sits out in the breeze behind the front wheel ).

I suppose that you could modify the dry element pod type filter that the Turbo kit comes with if you really want the Turbo and for offroad use.

I've done the 290 kit, and along with fuel programmer, intake & exhaust mods, it's a very welcome increase in useable power & torque. I reckon that to add the stroker kit and take it right out to the 306 would be the best overall option for this little bike. ( But still very good at "just" the 290 kit ).

Cheers.

What kind of engine life are tou guys seeing out of the big bore and stroker motors? I've talked to mr Morgan at mpfab a few times and he sees great results out of the turbo kit.

There have been good reviews on the 280 & 290 kits. The Athena kit has had some reports of shorter ring life blamed on the single compression ring vs dual compression rings like stock & the TR 280 kit. 290 users have noted increased vibration from the heavier piston, not a deal breaker for most but it's there. The 280 kit performs very similarly but has a lighter 3 ring piston & service life should be similar to stock.
The Turbo is cool, but vulnerable for off road use.



I'm assembling a 306 now with a TR 3 ring piston, a used, recoated Athena cylinder & a +3mm stroker crank balanced to the 83mm piston.





This should be in the 35-37HP no fuss combination

nice!! If you don't mind me asking what will you have in the build when complete? I know the turbo kit is 2050 which includes a PCV

I bought the uninstalled TR kit from a member here very reasonably, so I have about half of that invested including the purchase of a spare engine that I'm building instead of messing with my 5k mile stock engine. The spare came with a hurt Athena kit, which is why I wound up using an Athena cylinder with my kit.

The Turbo is probably the best bang for the buck if you are stuck on hopping up the 250. A 2012 or newer 450F would still kick it's butt

thanks for the input....decided to go with the big bore and stroker instead of the turbo. My brother just got a new drzsm so we are going to get out of road racing and just mess around in the woods more like we used to. should be fun! thanks for the help

Did you start on yours yet? I am very impressed with mine. It's actually easier to ride with the improved torque & pull hwy speeds much easier, So easy I'm thinking about gearing it taller than my 14/49 because it pulls 6th so much easier I keep looking for 7th..