TT250 Jet Kit install, high idle

Huntsman911 · 03-18-2021, 09:10 PM

Hey all,

I just installed the bigger jet kit in the TT250, but now my idle is rediculously high. Like 12k high. I tried adjusting the idle screw, but it doesn't seem to be dropping the RPMs. I checked the throttle and it seemed ok, but I'm still getting high RPMs. Is it from the kit? Or just some odd user error?

Bill Hilly · 03-18-2021, 09:27 PM

Is your cable seated in it's small bore on the threaded cap on top of the carb?

tknj99 · 03-18-2021, 09:31 PM

^ this.. if you insert the carb slide in the wrong orientation that will happen.. try unscrewing and then re-orient it to the other side, making sure it slides all the way down before you screw the top back on

Bill Hilly · 03-18-2021, 09:35 PM

Quote:

Originally Posted by tknj99

^ this.. if you insert the carb slide in the wrong orientation that will happen.. try unscrewing and then re-orient it to the other side, making sure it slides all the way down before you screw the top back on

You know a lot more in this area than I do. I was just mentioning what I saw in a MotoCheez video after he jetted a Brozz carb.

DohcBikes · 03-18-2021, 09:43 PM

+1 on slide being backwards.

Huntsman911 · 03-19-2021, 01:08 AM

Thanks for the replies, I'll take a look tomorrow and see what's up with it. It probably was on wrong. I'll update when I figure it out

Huntsman911 · 03-23-2021, 11:17 AM

So it was the needle on backwards. I fixed that, but it's now idleing at 4k at full choke. I did modify the airbox to allow more airflow, should I set the needle leaner to drop the RPMs?

tknj99 · 03-23-2021, 11:26 AM

To rule it out, make sure the throttle adjustment is correct.. it may be holding the throttle slightly open. You can spin the adjuster loose, put in some slack if needed to validate that.

**JerryHawk250** · 03-23-2021, 11:33 AM

Check to make sure the cable is inserted all the way in at the top of the carb.

TxTaoRider · 03-23-2021, 11:39 AM

It's also possible the end of the cable isn't seated correctly in the throttle slide.
Also on some of these bikes theres a hose that connects to the intake between the carb and head, make sure that didn't come off (or cap it off if you've removed the smog stuff). It would cause a vacuum leak and high idle.

Huntsman911 · 04-02-2021, 07:20 PM

I can't tell if the needle in completely. It seems to be as far down as it goes

http://imgur.com/a/7a8jeFC

Megadan · 04-02-2021, 09:07 PM

Your throttle slide is stuck halfway open. That is your problem.

Huntsman911 · 04-02-2021, 09:28 PM

Well damn. Thank you. I'll fanaggle with it

Huntsman911 · 04-04-2021, 05:49 PM

Behold! The source of my slide not fitting correctly

https://imgur.com/a/76cXIMb

Megadan · 04-04-2021, 06:55 PM

Quote:

Originally Posted by Huntsman911

Behold! The source of my slide not fitting correctly

https://imgur.com/a/76cXIMb

Yeah, that would definitely do it. Needle ia likely bent a bit now too.

03-18-2021, 09:10 PM	#1
Huntsman911 Join Date: Mar 2021 Posts: 9	TT250 Jet Kit install, high idle Hey all, I just installed the bigger jet kit in the TT250, but now my idle is rediculously high. Like 12k high. I tried adjusting the idle screw, but it doesn't seem to be dropping the RPMs. I checked the throttle and it seemed ok, but I'm still getting high RPMs. Is it from the kit? Or just some odd user error?
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03-18-2021, 09:31 PM	#3
tknj99 Join Date: Oct 2020 Location: Central VA Posts: 1,259	^ this.. if you insert the carb slide in the wrong orientation that will happen.. try unscrewing and then re-orient it to the other side, making sure it slides all the way down before you screw the top back on __________________ 2024 Zuma Storm 150 DLX 2019 Beta 430 RRS 2018 VStrom 1000 XT Former China Bikes: Tao DBX1, Brozz 250, CSC RX4, Titan DLX, Templar X
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03-23-2021, 11:17 AM	#7
Huntsman911 Join Date: Mar 2021 Posts: 9	Update and I still need some help So it was the needle on backwards. I fixed that, but it's now idleing at 4k at full choke. I did modify the airbox to allow more airflow, should I set the needle leaner to drop the RPMs?
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03-23-2021, 11:26 AM	#8
tknj99 Join Date: Oct 2020 Location: Central VA Posts: 1,259	To rule it out, make sure the throttle adjustment is correct.. it may be holding the throttle slightly open. You can spin the adjuster loose, put in some slack if needed to validate that. __________________ 2024 Zuma Storm 150 DLX 2019 Beta 430 RRS 2018 VStrom 1000 XT Former China Bikes: Tao DBX1, Brozz 250, CSC RX4, Titan DLX, Templar X
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03-23-2021, 11:33 AM	#9
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,578	Check to make sure the cable is inserted all the way in at the top of the carb. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 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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03-18-2021, 09:27 PM	#2
Bill Hilly Join Date: Feb 2021 Posts: 948	Is your cable seated in it's small bore on the threaded cap on top of the carb?
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03-18-2021, 09:43 PM	#5
DohcBikes Banned Join Date: Oct 2016 Posts: 59	+1 on slide being backwards.
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03-19-2021, 01:08 AM	#6
Huntsman911 Join Date: Mar 2021 Posts: 9	Thanks for the replies, I'll take a look tomorrow and see what's up with it. It probably was on wrong. I'll update when I figure it out
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03-23-2021, 11:39 AM	#10
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	It's also possible the end of the cable isn't seated correctly in the throttle slide. Also on some of these bikes theres a hose that connects to the intake between the carb and head, make sure that didn't come off (or cap it off if you've removed the smog stuff). It would cause a vacuum leak and high idle. __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
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04-02-2021, 07:20 PM	#11
Huntsman911 Join Date: Mar 2021 Posts: 9	Update: still no fun I can't tell if the needle in completely. It seems to be as far down as it goes http://imgur.com/a/7a8jeFC
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04-02-2021, 09:07 PM	#12
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 8,044	Your throttle slide is stuck halfway open. That is your problem. __________________ 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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04-02-2021, 09:28 PM	#13
Huntsman911 Join Date: Mar 2021 Posts: 9	Well damn. Thank you. I'll fanaggle with it
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04-04-2021, 05:49 PM	#14
Huntsman911 Join Date: Mar 2021 Posts: 9	Update Behold! The source of my slide not fitting correctly https://imgur.com/a/76cXIMb
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