TT 250 idles high then low not sure how to adjust

Kingraider · 07-24-2018, 11:20 PM

Hey fellas so my tt 250 is brand new and it has a low idle so I tried turning up the idle screw clock wise just a little to just under 2000 rpm's and that worked and it idles fine like that . But the next morning on a cold start it idles really high tach is at 2 to 3 thousand rpms.. so I'm like going back and fourth with the idle screw . Here is a pic of the carb.. I know the idle screw what are the other screws for that you can see??
... any help would be appreciated

chuck · 07-25-2018, 06:48 AM

Make sure the choke lever is in the normal operating position.

Kingraider · 07-29-2018, 01:00 AM

Thanks chuck.. I think I was just tripping.. lol.. it runs great.. I just have to break it in. Now it's fine

kirkallen143 · 07-29-2018, 05:33 PM

On a cold engine it will need more fuel to get it going up to operating temps. With an engine surging/searching for an idle like you describe is the signs of a lean condition. With stock jetting, if you have not adjusted the idle mixture screw to 2.5 turns out from fully seated, could be the reason. You will have to pull the cap/plug that is covering the mixture screw to access it. This requires you to pull the carb off to accomplish. The 2.5 turns out from fully seated is just an average setting for most, it will depend on your altitude.

Kirk

Kingraider · 07-29-2018, 07:15 PM

thanks kirk!! its weird.. now it idles fine no more surging or anything and has great power like it should being a new bike.. it was just when I first got it.. ya know barley idling so I turn up the idle then to high once im home... hum but good now .. no more having to mess with the idle screw seems to be great now.. not sure why? but im good with it..lol.. bike only has 50 miles now.. I also changed the oil with Valvoline 4 stroke motorcycle oil 10w 40 from Walmart.. gotta love it!!

Kingraider · 07-29-2018, 07:17 PM

kirk you see my card in the above pic?? sorry its sideways.. but anyways if I did have to remove the carb where is the cap located on the carb that I have to remove to adjust the fuel mixture screw located at???

kirkallen143 · 07-30-2018, 08:54 AM

The location of the mixture screw is better seen from the other side of the engine where the starter is. It is placed under the carb towards the cylinder head, there should is a little cast protrusion that sticks down about a 1/2" on the carb itself, kind of on the carb's center line. If you take the carb off you will see the cap we are referring to. That's what you have to drill out/pop off to get to the mixture screw. I bet someone has a pic of it on here somewhere...maybe search up mixture screw?

That great it is running better now, must have been a little hiccup in there and sorted itself out since you have more running time with the hawk.

Kirk

kirkallen143 · 07-30-2018, 09:01 AM

Let's see if this works for ya...it shows exactly where the mixture screw is and how to get to it.

https://hawk250.com/hawk-250-tune-st...buretor-video/

Kirk

Kingraider · 07-30-2018, 04:30 PM

Oh cool thanks kirk.. you know my bike is the tt 250 right? But the carb looks the same and I do see on mine at the bottom of the bowl there is a metal cap there with a blue mark on it or right above it.. so just put a screw in a little and back it out to remove the cap and there is my access to the idle mixture screw.. cool !! If I need to adjust it now I know.. bike is idling fine now.. sometimes it is a little low.. but for the most part ok..

DaveinOC · 08-04-2018, 10:05 AM

I have since replaced the stock exhaust and carb but my TT250 Keima has a solid fuel mix screw that was rounded off. I thought it was a plug but when the drill didn't stop after about 5mm I used an easy-out and the whole thing unscrewed. So my fuel screw is itself the plug with no notch or phillips head. Before I could get the new Mikuni (sort of) dialed in I tapped the center of the fuel mix screw and inserted a 25mm (20mm? I forget the exact length) long 4mm screw with a phillips head, so now it sticks out below the bottom of the carb and can be adjusted.

Just wanted to warn you in case you haven't tried to remove the "plug" yet - on mine there was no plug and if you keep drilling until you reach no resistance you will ruin the screw AND the carb. Just sayin...

08-04-2018, 10:05 AM	#10
DaveinOC Join Date: Jun 2018 Posts: 27	I have since replaced the stock exhaust and carb but my TT250 Keima has a solid fuel mix screw that was rounded off. I thought it was a plug but when the drill didn't stop after about 5mm I used an easy-out and the whole thing unscrewed. So my fuel screw is itself the plug with no notch or phillips head. Before I could get the new Mikuni (sort of) dialed in I tapped the center of the fuel mix screw and inserted a 25mm (20mm? I forget the exact length) long 4mm screw with a phillips head, so now it sticks out below the bottom of the carb and can be adjusted. Just wanted to warn you in case you haven't tried to remove the "plug" yet - on mine there was no plug and if you keep drilling until you reach no resistance you will ruin the screw AND the carb. Just sayin... __________________ 1978 Husqvarna 250 WR 1991 Husqvarna WXE 250 2018 CSC TT250
	2

07-25-2018, 06:48 AM	#2
chuck Join Date: Sep 2015 Posts: 436	Make sure the choke lever is in the normal operating position.
	1

07-29-2018, 01:00 AM	#3
Kingraider Join Date: Jul 2018 Location: las vegas nevada Posts: 70	Thanks chuck.. I think I was just tripping.. lol.. it runs great.. I just have to break it in. Now it's fine
	0

07-29-2018, 05:33 PM	#4
kirkallen143 Join Date: May 2015 Posts: 84	On a cold engine it will need more fuel to get it going up to operating temps. With an engine surging/searching for an idle like you describe is the signs of a lean condition. With stock jetting, if you have not adjusted the idle mixture screw to 2.5 turns out from fully seated, could be the reason. You will have to pull the cap/plug that is covering the mixture screw to access it. This requires you to pull the carb off to accomplish. The 2.5 turns out from fully seated is just an average setting for most, it will depend on your altitude. Kirk
	0

07-29-2018, 07:15 PM	#5
Kingraider Join Date: Jul 2018 Location: las vegas nevada Posts: 70	thanks kirk!! its weird.. now it idles fine no more surging or anything and has great power like it should being a new bike.. it was just when I first got it.. ya know barley idling so I turn up the idle then to high once im home... hum but good now .. no more having to mess with the idle screw seems to be great now.. not sure why? but im good with it..lol.. bike only has 50 miles now.. I also changed the oil with Valvoline 4 stroke motorcycle oil 10w 40 from Walmart.. gotta love it!!
	0

07-29-2018, 07:17 PM	#6
Kingraider Join Date: Jul 2018 Location: las vegas nevada Posts: 70	kirk you see my card in the above pic?? sorry its sideways.. but anyways if I did have to remove the carb where is the cap located on the carb that I have to remove to adjust the fuel mixture screw located at???
	0

07-30-2018, 08:54 AM	#7
kirkallen143 Join Date: May 2015 Posts: 84	The location of the mixture screw is better seen from the other side of the engine where the starter is. It is placed under the carb towards the cylinder head, there should is a little cast protrusion that sticks down about a 1/2" on the carb itself, kind of on the carb's center line. If you take the carb off you will see the cap we are referring to. That's what you have to drill out/pop off to get to the mixture screw. I bet someone has a pic of it on here somewhere...maybe search up mixture screw? That great it is running better now, must have been a little hiccup in there and sorted itself out since you have more running time with the hawk. Kirk
	1

07-30-2018, 09:01 AM	#8
kirkallen143 Join Date: May 2015 Posts: 84	Let's see if this works for ya...it shows exactly where the mixture screw is and how to get to it. https://hawk250.com/hawk-250-tune-st...buretor-video/ Kirk
	1

07-30-2018, 04:30 PM	#9
Kingraider Join Date: Jul 2018 Location: las vegas nevada Posts: 70	Oh cool thanks kirk.. you know my bike is the tt 250 right? But the carb looks the same and I do see on mine at the bottom of the bowl there is a metal cap there with a blue mark on it or right above it.. so just put a screw in a little and back it out to remove the cap and there is my access to the idle mixture screw.. cool !! If I need to adjust it now I know.. bike is idling fine now.. sometimes it is a little low.. but for the most part ok..
	0