10-10-2019, 12:06 PM | #1 |
Join Date: Apr 2019
Location: Strong Island New Yawk
Posts: 464
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I'm RICH !!!
Need a little help and I did fumble through some other threads via search, but I'm looking for more of a starting point.
Bone stock TBR7 with the exception of 2 carb tweaks: #1 swapped\bumped up main jet to 100 ( from 88 stock ) - I think the pilot is 40 or 41 ..whatever the stock is. #2 adjustable needle moved the clip 1 notch downward toward the point ( which you would say I "raised" it 1 notch ) air\fuel ratio is 2 turns out Idle set to 1500 RPM via portable lawnmower tach Township is 60 feet above sea level Pulled the plug and she is black soot.. no pic needed, its rich, overall performance is great except in 1st gear while cruising to stop sign with no throttle she is a bit sputtery...no issues WOT, no hesitation, she runs perfect in my opinion. Thoughts on what to adjust first ? Needle clip or air\fuel screw ? Main should be fine at 100 in my opinion Thanks |
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10-10-2019, 01:20 PM | #2 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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No throttle sputtering is the idle mixture screw. 2 turns is likely too rich, back it off to 1.5 turns and go from there.
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Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124 |
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10-10-2019, 01:29 PM | #3 |
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Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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Snap!! And I though you hit the lottery. I was going to hit you up for a little cash.
What Megadan said.
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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10-10-2019, 02:47 PM | #4 |
Join Date: Jun 2018
Location: Pocatello, Idaho
Posts: 794
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I also thot you hit the lottery!
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A family that works together, plays together, shoots and trains together, and sleds together, stays together. Second amendment! SkiDoo sleds, NOW 2 TTR225, and a BMS250. A couple of quotes (we are not farmers) "I don't get off the farm much" "Am too old school" I call the china bikes "the china syndrome". |
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10-10-2019, 02:50 PM | #5 |
Join Date: Apr 2019
Location: Strong Island New Yawk
Posts: 464
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I'm in Sales... grabbing attention is what I do !
Thank you all ..I shall start with the mixture screw..which is easier to muck with while on the bike... ( I think I can reach it with a stubby phillips ) Will report back |
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10-10-2019, 04:24 PM | #6 |
Join Date: Jun 2019
Posts: 126
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Had me fooled too. Was fitting to get out the ole Tin cup n start beggin. Not too proud. Hell will beg for sex, why not for a new performance exhaust. The 2nd I'll actually get to enjoy for a longer duration. Now before I get accused of anything. I warn all of'm.
"Might not be any good, but at least it's over quick". |
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10-10-2019, 10:35 PM | #8 |
Join Date: Jun 2019
Posts: 126
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Lol, king, ��,. Lets just agree, that we give'm the option of looking at it as "glass half full"
No-one ever gets to heaven , and they're one big regret is,.. Getting too much booty.! |
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04-24-2020, 08:43 AM | #9 |
Join Date: Apr 2019
Location: Strong Island New Yawk
Posts: 464
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BUMP BACK UP
Carb Setting - 100 main - 1 shim slot down ( needle raised up 1 notch ) - Air\Fuel 1.5 out from bottom - Idle 1500 RPMs set by portable tach Still running rich ( based on black plug appearance - new NGK used to test ) Originally I was 2 turns on on Air\Fuel and back'd her down, still rich Question is - do I continue focus on Air\Fuel screw? (maybe 1 turn out ) or ditch the shim back to stock ? (when I say shim, it is an adjustable needle , not actual shim) Bike feels dialed in perfect for me, no choke needed at all even a 50 degree morning, I would hate to change it but spark plug tells a different story Appreciate your views? |
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04-24-2020, 09:12 AM | #10 | |
Join Date: Jan 2019
Location: Silver City New Mexico
Posts: 290
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Quote:
Could it be a float level issue which is more pronounced at slower engine speeds? or a pilot jet that has either fallen out or is very loose ? |
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04-24-2020, 10:36 AM | #11 | |
Join Date: May 2013
Location: finger lakes NY
Posts: 2,061
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Quote:
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04-24-2020, 11:30 AM | #12 | |
Join Date: Apr 2019
Location: Strong Island New Yawk
Posts: 464
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Quote:
I could try a plug chop, my first 2 plugs were resistor plugs ( with the stock resistor cap ) - I just put a new plug in 2 weeks ago (non resistor plug ). Not sure if that would explain the darkness on the plug, I will snap a photo today and upload of the old plug and pull the most recent (non resistor plug ). Again, the bike rides the best I have had it and I'm second guessing the richness based on old plug color and the fact that I never need choke ( shouldnt even a properly tuned bike - need a little choke on a 50 degree cold start morning ? |
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04-24-2020, 02:15 PM | #13 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,100
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The problem with just pulling the plug and going "look, it's rich" is that you have no idea what throttle position (aka Jet) is causing the condition. You just used all of them up to that point.
If you turned the idle mixture in half a turn with no change AND the bike needs no choke to start on a 50 degree day, you need to step down the pilot jet size. If it is a 40, drop to a 38 to start and dial in the idle mixture. If it is still a bit rich, try a 36. Keep in mind that adjusting the pilot jet size may affect the rest of your jetting as well, so be prepared to possibly make adjustments elsewhere.
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Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124 |
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04-24-2020, 03:31 PM | #14 |
Join Date: Nov 2018
Location: Stockport, Oh.
Posts: 1,442
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What Dan said, but another factor is the VERY restrictive airbox on the TBR7. When we were dialing Jay's TBR7 carb in we incorrectly assumed it would be similar to my Hawk jetting. Nope, it took smaller jets because of reduced air flow. That being said, running a little rich isn't a bad thing as long as it's not fouling the plug. Turn the mixture screw to 1 turn out and see if ya like it any better.
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04-24-2020, 06:03 PM | #15 |
Join Date: Apr 2019
Location: Strong Island New Yawk
Posts: 464
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1Leg presents the easiest idea to go to 1 turn ( from 1.5)
Plug pics below Plug on BOTTOM is 1 month old at 2 turns out A\F screw Plug on TOP is 1 week old at 1.5 turns out A\F screw |
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