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General Discussions & Announcements General Announcements, General Questions, e.g. What bike do I buy?, etc. |
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#1
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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.
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2008 KTM 300 XC-W 2017 KTM 300 XC-W 2018 Gasgas 250 XC 2019 KTM 250 XCF |
#2
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Quote:
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#3
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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
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#4
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I agree with the previous comments and will add that the STIC metering block will make a great change across the board.
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#5
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Thanks for the suggestions gentlemen, much appreciated.
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2008 KTM 300 XC-W 2017 KTM 300 XC-W 2018 Gasgas 250 XC 2019 KTM 250 XCF |
#6
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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?
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2008 KTM 300 XC-W 2017 KTM 300 XC-W 2018 Gasgas 250 XC 2019 KTM 250 XCF |
#7
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#8
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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. |
#9
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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.
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'07 EC300 GG '14 TXT250 GG '? 496 CPI Cheetah RZ/RGV hybrid '22 765 Street Triple RS '21 XTrainer '69 Stinger T125 Suzuki '23 TRS 250RR (it's a Trials thing) |
#10
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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.
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2008 KTM 300 XC-W 2017 KTM 300 XC-W 2018 Gasgas 250 XC 2019 KTM 250 XCF |
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