Gio t3 Mikuni carb settings?

Jpratt · 04-08-2013, 09:49 PM

I can't get my quad to start and I know it's just not getting enough fuel, but I can't get the right settings for the needle and what not in the carb. I am not riding in cold weather so take that into account. I know most people on here have upgrade to the Mikuni carb for their gio beast or t3...

Weldangrind · 04-09-2013, 10:53 AM

Need more data.

Is this a new carb, or was it installed from the factory? Has it been sitting with fuel in it over the winter? Have you cleaned the slow jet?

Jpratt · 04-10-2013, 10:29 AM

The carb was installed last summer and ran fine; as it Got colder it wouldn't start so I just left it... It was sitting with fuel In it and I did clean it so now I am hoping it will start, but I don't know what the slow jet is... I basically only know where the idle screw is and the throttle needle... what level I should have the clip on the throttle needle? So basically I don't know much about the carb, how many things should I be adjusting other then the idle screw and the clip on the throttle needle??

Weldangrind · 04-10-2013, 10:51 AM

Idle screw (to suit your taste), pilot mixture screw (to smooth out the transition from slow jet to main jet) and clip (mid-range throttle response).

Drain the carb, remove it, flip it over, remove the bowl and study. You'll see the round head main jet (that is likely stamped 100) and the small slow jet next to it (which is likely stamped 20). My guess is that you need to remove the slow jet and buy a 25 or 30 from your local Yamaha dealer. A fatter main jet wouldn't hurt, either. Try a 110.

Jpratt · 04-10-2013, 05:42 PM

Well considering it ran fine last year, I don't think I need different jets, what level on the needle should I have the clip?

Weldangrind · 04-10-2013, 11:41 PM

Leave the clip wherever it was when it ran; it doesn't affect starting or idling. My guess is that your slow jet is clogged. I know you said you cleaned it, but it's really small and difficult to clean.

Jpratt · 04-11-2013, 12:51 AM

Got it started, wouldn't run without the choke and revved high, but found a crack in the intake manifold. So now I have to replace that and I should be set.

Weldangrind · 04-11-2013, 10:12 AM

That makes perfect sense. A replacement intake tube is easily found on eBay.

Jpratt · 04-11-2013, 04:56 PM

one last thing, what level would you suggest i have the clip on the throttle needle?

Weldangrind · 04-11-2013, 11:01 PM

The middle position. After you re-install it, go for a ride and see how it behaves at mid-throttle. If it's not right, move the clip one notch and re-test. If it gets better, you're headed in the right direction.

04-08-2013, 09:49 PM	#1
Jpratt Join Date: Jun 2009 Posts: 37	Gio t3 Mikuni carb settings? I can't get my quad to start and I know it's just not getting enough fuel, but I can't get the right settings for the needle and what not in the carb. I am not riding in cold weather so take that into account. I know most people on here have upgrade to the Mikuni carb for their gio beast or t3...
	0

04-09-2013, 10:53 AM	#2
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Need more data. Is this a new carb, or was it installed from the factory? Has it been sitting with fuel in it over the winter? Have you cleaned the slow jet? __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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04-10-2013, 10:51 AM	#4
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Idle screw (to suit your taste), pilot mixture screw (to smooth out the transition from slow jet to main jet) and clip (mid-range throttle response). Drain the carb, remove it, flip it over, remove the bowl and study. You'll see the round head main jet (that is likely stamped 100) and the small slow jet next to it (which is likely stamped 20). My guess is that you need to remove the slow jet and buy a 25 or 30 from your local Yamaha dealer. A fatter main jet wouldn't hurt, either. Try a 110. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

04-10-2013, 11:41 PM	#6
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Leave the clip wherever it was when it ran; it doesn't affect starting or idling. My guess is that your slow jet is clogged. I know you said you cleaned it, but it's really small and difficult to clean. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

04-11-2013, 10:12 AM	#8
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	That makes perfect sense. A replacement intake tube is easily found on eBay. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

04-10-2013, 10:29 AM	#3
Jpratt Join Date: Jun 2009 Posts: 37	The carb was installed last summer and ran fine; as it Got colder it wouldn't start so I just left it... It was sitting with fuel In it and I did clean it so now I am hoping it will start, but I don't know what the slow jet is... I basically only know where the idle screw is and the throttle needle... what level I should have the clip on the throttle needle? So basically I don't know much about the carb, how many things should I be adjusting other then the idle screw and the clip on the throttle needle??
	0

04-10-2013, 05:42 PM	#5
Jpratt Join Date: Jun 2009 Posts: 37	Well considering it ran fine last year, I don't think I need different jets, what level on the needle should I have the clip?
	0

04-11-2013, 12:51 AM	#7
Jpratt Join Date: Jun 2009 Posts: 37	Got it started, wouldn't run without the choke and revved high, but found a crack in the intake manifold. So now I have to replace that and I should be set.
	0

04-11-2013, 04:56 PM	#9
Jpratt Join Date: Jun 2009 Posts: 37	one last thing, what level would you suggest i have the clip on the throttle needle?
	0

04-11-2013, 11:01 PM	#10
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	The middle position. After you re-install it, go for a ride and see how it behaves at mid-throttle. If it's not right, move the clip one notch and re-test. If it gets better, you're headed in the right direction. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0