proper idle RPM?

su98 · 04-30-2022, 01:14 PM

TT250 so my question is what is a proper idle RPM? 750?

Mudflap · 04-30-2022, 01:41 PM

More likely 1500.

su98 · 04-30-2022, 02:38 PM

thanks just purrs

Megadan · 04-30-2022, 03:38 PM

1500 rpm +/- 100rpm.

flopsweat · 05-02-2022, 09:46 AM

I asked this to a tech at CSC as well, and he said he sets his just under 2k after it's fully warmed up.

Not sure if I should start a different thread, as it's related, but does anyone know why a TW200 seems to automatically hold the engine at higher revs when the choke is engaged? Then once turned it's fully opened, it returns back to normal idling speed. This would be so great for the TT250, as I always have to hold the throttle for around 2min until it will stay on even with the choke fully closed. I know this is what the manual even says to do, but I'm finding myself jealous of this feature on my buddy's Tdub.

Mudflap · 05-02-2022, 10:44 AM

TW carbs have either a fast idle cam or they have an enrichment circuit rather than a choke. A throttle lock would somewhat solve your problem.

Megadan · 05-02-2022, 03:01 PM

These carbs are simple mechanical chokes with no enrichment. Idle air is what bypasses the choke plate and slide, and fuel is added through idle mitxture screw circuit and pulled via vacuum. The TW and many other styles of carbs use a separate idle circuit that draws air and mixes it with the idle fuel, aka the enrichment circuit that Mudflap mentiones. That added air is why the idle increases.

A PE carb does have an enrichment circuit, and the PE28FL is a great upgrade if you want to go down that path.

flopsweat · 05-02-2022, 06:04 PM

Good to know, thanks! That definitely might be something I'll consider in the near future.

04-30-2022, 01:14 PM	#1
su98 Join Date: Apr 2022 Location: Pittsburgh Posts: 58	proper idle RPM? TT250 so my question is what is a proper idle RPM? 750?
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04-30-2022, 03:38 PM	#4
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,982	1500 rpm +/- 100rpm. __________________ 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
	1

05-02-2022, 03:01 PM	#7
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,982	These carbs are simple mechanical chokes with no enrichment. Idle air is what bypasses the choke plate and slide, and fuel is added through idle mitxture screw circuit and pulled via vacuum. The TW and many other styles of carbs use a separate idle circuit that draws air and mixes it with the idle fuel, aka the enrichment circuit that Mudflap mentiones. That added air is why the idle increases. A PE carb does have an enrichment circuit, and the PE28FL is a great upgrade if you want to go down that path. __________________ 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 Last edited by Megadan; 05-03-2022 at 01:28 AM.
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04-30-2022, 01:41 PM	#2
Mudflap Join Date: Sep 2014 Posts: 1,870	More likely 1500.
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04-30-2022, 02:38 PM	#3
su98 Join Date: Apr 2022 Location: Pittsburgh Posts: 58	thanks just purrs
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05-02-2022, 09:46 AM	#5
flopsweat Join Date: Oct 2021 Location: The burbs of Chicago Posts: 235	I asked this to a tech at CSC as well, and he said he sets his just under 2k after it's fully warmed up. Not sure if I should start a different thread, as it's related, but does anyone know why a TW200 seems to automatically hold the engine at higher revs when the choke is engaged? Then once turned it's fully opened, it returns back to normal idling speed. This would be so great for the TT250, as I always have to hold the throttle for around 2min until it will stay on even with the choke fully closed. I know this is what the manual even says to do, but I'm finding myself jealous of this feature on my buddy's Tdub.
	0

05-02-2022, 10:44 AM	#6
Mudflap Join Date: Sep 2014 Posts: 1,870	TW carbs have either a fast idle cam or they have an enrichment circuit rather than a choke. A throttle lock would somewhat solve your problem.
	2

05-02-2022, 06:04 PM	#8
flopsweat Join Date: Oct 2021 Location: The burbs of Chicago Posts: 235	Good to know, thanks! That definitely might be something I'll consider in the near future.
	0