Need suggestions for more bottom hit
 

I have a 2018 250 XC with a FMF Gnarly pipe and I'm a little disappointed with the bottom end response. Has anyone experimented with a Smart Carb on their GG bike? I'm also open to moving around the setting for the exhaust valve or getting a head mod. I just need/want a little more hit off the bottom to loft the front wheel over logs, ditches and trail obstacles. :confused:

Start with playing with the pv adjuster since thats free. The Rk tek gave my 300 more power across the board. Or your other option is buying a 300 top end and bolting it on.

Put a 51 tooth rear sproket set the squish band play with different jetting I like jd jet kit and check power valve setting it will rip then

I agree with the previous comments and will add that the STIC metering block will make a great change across the board.

Thanks for the suggestions gentlemen, much appreciated.

Since I want a little more bottom hit. When I adjust the exhaust valve, I'll want to decrease the pre-load so it opens sooner, correct? So that will be a counter-clockwise adjustment (lefty loosy). What is the stock setting, 2 turns out from closed? What is the suggested turn increments, 1/4, 1/2 or a full turn?

Stock is 2 turns out from full stop. Technically in is supposed to give more bottom end grunt but if you are looking for more of a quicker revving bike then go out. Out makes the pv open sooner. My recommendation is to play with it and see what you prefer.

Keeping the PV closed will help with off idle power.. If it opens too soon you'll have a more aggressive delivery, which is not necessarily 'more'..

What gearing do you have now?

What jetting do you have?

My experience with these engines is..

13-50/51 gearing
head modification (squish and comp ratio)
quick pull G2 throttle
jetted with Keihin needle for response and delivery (has varied on each engine).

I have used Lectrons and Smart Carbs.. I don't think they offer value for money. They work well enough, but aren't a magic product either. Still require some adjustment and still aren't 'perfect' persay.

The above list I do before I worry about anything else.

For tree roots, throttle response is key. With the wrong needle, in particular the stock needle it will be bogging for long enough for response to be soggy.

Thanks again folks. You've given me some excellent starting points, along with good ideas to develop a plan. Even though I haven't specifically said it in this thread I really do like the bike and I'm looking to tailor it's traits to work for me.