Ssr xf250 - Page 3

DualSport SSR · 05-24-2023, 12:15 AM

I am trying to get my bike to run right after re jetting with the Sigma 6 kit.
My SSR is a 2023 and was stock. I'm at sea level. These bikes are set very lean for EPA, and my bike was hard to start without choke. It would die at idle or starting off in 1st until good and warmed up.
Drove nicely otherwise though.

I put the new 40 pilot jet in
Swapped the 128 stock main jet with 135
And added a shim/washer to the needle to raise it up a little.

This improved starting and idle greatly. I started the bike first try with no choke, and it would not die at idle or when starting off in 1st. I assumed mostly because of the 40 pilot jet allowing more fuel at these low RPMs.

Problem is, now the bike pops or sputters when letting off throttle in the 1/4 to 3/4 range.
It also started hesitating, lurching at 3/4 to Full/WOT.
I haven't done any of the airbox or muffler mods.

DualSport SSR · 05-25-2023, 12:36 PM

Success! I took a crash course through YouTube to learn CV carb jetting & Air/Fuel mixture.
This video, if you're looking to learn, was very helpful...

Here's what worked for me. (more details & explanation in the video)
It was helpful to tune each throttle range (circuit) separately, and test drive after each.

1st. Pilot Jet: Effects 0 to 1/4 throttle.
Leaving the new 40 pilot jet in, I set idle speed and fuel screw so bike is running well.
It starts without choke now and does not die at idle or when starting off.

2nd. Main Jet: Effects 3/4 to full throttle.
Lurching and hesitating at this throttle range (feels like bike suddenly slows then recovers, like you're hitting a wall of wind) is a sign of being too rich.
Downsized the Main Jet from 135 to 130 but symptoms remained. Re-installed stock 128 and this circuit runs great!

3rd. Slide Needle: Mostly effects 1/4 to 3/4 throttle.
I was hearing pops in this range after letting off throttle, so I was too lean.
To richen up this circuit, I added a shim/washer to raise the needle, allowing more fuel in the mix.

I am really enjoying how the bike runs now! Starts up easy, good power throughout, and no popping!

2LZ · 05-25-2023, 12:58 PM

CV carbs. I've only been able to achieve 90% success with those. I just rebuilt the one on Mrs. 2LZ Sporty and still get an occasional fart when I wick the throttle downshifting. The one on Q (much like your SSR) I've had the best luck with.

Good job on the fix! I'm glad to see SSR is still selling the XF250. GREAT bikes. Q (QLink XP200) has been flawless since 2009.

dh · 05-31-2023, 01:35 PM

Good job getting it running good. I also installed a sigma kit as well as exhaust and air filter mods. I think 132.5 main jet was as big as I was able to go on mine.

05-24-2023, 12:15 AM	#31
DualSport SSR Join Date: May 2023 Posts: 3	Carb Questions, SSR XF250x I am trying to get my bike to run right after re jetting with the Sigma 6 kit. My SSR is a 2023 and was stock. I'm at sea level. These bikes are set very lean for EPA, and my bike was hard to start without choke. It would die at idle or starting off in 1st until good and warmed up. Drove nicely otherwise though. I put the new 40 pilot jet in Swapped the 128 stock main jet with 135 And added a shim/washer to the needle to raise it up a little. This improved starting and idle greatly. I started the bike first try with no choke, and it would not die at idle or when starting off in 1st. I assumed mostly because of the 40 pilot jet allowing more fuel at these low RPMs. Problem is, now the bike pops or sputters when letting off throttle in the 1/4 to 3/4 range. It also started hesitating, lurching at 3/4 to Full/WOT. I haven't done any of the airbox or muffler mods. Attached Thumbnails Last edited by DualSport SSR; 05-25-2023 at 11:58 AM. Reason: Edited for brevity
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05-25-2023, 12:58 PM	#33
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,081	CV carbs. I've only been able to achieve 90% success with those. I just rebuilt the one on Mrs. 2LZ Sporty and still get an occasional fart when I wick the throttle downshifting. The one on Q (much like your SSR) I've had the best luck with. Good job on the fix! I'm glad to see SSR is still selling the XF250. GREAT bikes. Q (QLink XP200) has been flawless since 2009. __________________ "Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350
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05-31-2023, 01:35 PM	#34
dh Join Date: Jun 2014 Location: NW Arkansas Posts: 451	Good job getting it running good. I also installed a sigma kit as well as exhaust and air filter mods. I think 132.5 main jet was as big as I was able to go on mine. __________________ 2013 SSR XF-250
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05-25-2023, 12:36 PM	#32
DualSport SSR Join Date: May 2023 Posts: 3	Success! I took a crash course through YouTube to learn CV carb jetting & Air/Fuel mixture. This video, if you're looking to learn, was very helpful... Here's what worked for me. (more details & explanation in the video) It was helpful to tune each throttle range (circuit) separately, and test drive after each. 1st. Pilot Jet: Effects 0 to 1/4 throttle. Leaving the new 40 pilot jet in, I set idle speed and fuel screw so bike is running well. It starts without choke now and does not die at idle or when starting off. 2nd. Main Jet: Effects 3/4 to full throttle. Lurching and hesitating at this throttle range (feels like bike suddenly slows then recovers, like you're hitting a wall of wind) is a sign of being too rich. Downsized the Main Jet from 135 to 130 but symptoms remained. Re-installed stock 128 and this circuit runs great! 3rd. Slide Needle: Mostly effects 1/4 to 3/4 throttle. I was hearing pops in this range after letting off throttle, so I was too lean. To richen up this circuit, I added a shim/washer to raise the needle, allowing more fuel in the mix. I am really enjoying how the bike runs now! Starts up easy, good power throughout, and no popping!
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