Fires up, won't stay running.

jhawk19 · 10-13-2018, 08:50 PM

Hello all,

I just built my Hawk last night. I took today to change fluids (fresh oil, fork oil, brake fluid) and heat wrap the exhaust and finally to change the front and rear sprockets.

I went to fire it up for the first time and it fired right up!! Then it cut off. I can start it with the choke on all three settings, but it won't stay running...it just cuts off after 5 or 10 seconds.

I have adjusted the idle screw counterclockwise a few times, but same results...

What is my next step?

Red Hawk · 10-13-2018, 09:04 PM

How much gas in the tank?
Is the petcock tail end up ?

Fuel line kink free?

I know these are basically dumb questions but it's the small details.

jhawk19 · 10-13-2018, 09:11 PM

Quote:

Originally Posted by Red Hawk

How much gas in the tank?
Is the petcock tail end up ?

Fuel line kink free?

I know these are basically dumb questions but it's the small details.

1/2 tank of gas...petcock is on...fuel line has no kinks, it's a smooth "s-curve" from the petcock to the carb.

Red Hawk · 10-13-2018, 09:19 PM

There's a fuel drain screw at the very very bottom of the carb crack it about 2 turns and catch the fuel draining out, it should have good uninterrupted flow.

Not spurts. Flow, spert.

jhawk19 · 10-13-2018, 09:30 PM

Quote:

Originally Posted by Red Hawk

There's a fuel drain screw at the very very bottom of the carb crack it about 2 turns and catch the fuel draining out, it should have good uninterrupted flow.

Not spurts. Flow, spert.

Yep, turned that too. I let the fuel drain so that I could remove the carb. I was going to replace it, but decided to run stock for a while before I make changes. Fuel drained nice and smooth until it dribbled to a stop. Tightened the screw and reconnected the carb to get to the point described in my OP.

Red Hawk · 10-13-2018, 09:37 PM

I'd pull the plug and see if it's wet or dry?
If it's wet it's fouled out. But it's a long shot.

jhawk19 · 10-13-2018, 09:55 PM

Quote:

Originally Posted by Red Hawk

I'd pull the plug and see if it's wet or dry?
If it's wet it's fouled out. But it's a long shot.

I put a brand new NGK plug in today. I'll have to check to see if it's wet...otherwise (if it's dry), anything else I can do? I mean, it starts, right away, first push of the button...

jhawk19 · 10-13-2018, 09:55 PM

Quote:

Originally Posted by jeffrey

Turn the idle screw clockwise to raise the idle speed.

OOOHHHHHHH!!!! Clockwise!!!! I've been turning it counterclockwise!!!

Red Hawk · 10-13-2018, 09:56 PM

That might be it

roundhouse · 10-14-2018, 09:46 AM

Did that fix your problem? When it is cold I have to turn mine a couple turns higher to get it going then back it off after a couple of minutes.

bogieboy · 10-14-2018, 03:09 PM

Quote:

Originally Posted by jhawk19

Yep, turned that too. I let the fuel drain so that I could remove the carb. I was going to replace it, but decided to run stock for a while before I make changes. Fuel drained nice and smooth until it dribbled to a stop. Tightened the screw and reconnected the carb to get to the point described in my OP.

If your tank is half full, this is your issue... check your petcock... the way your float works, you should have a constant drain of fuel until the tank runs dry.... you either have a sticking float, or a shoddy petcock... your bike runs fine for a bit because ths bowl fills up, but then you run the fuel in the bowl out and its not filling back up fast enough to keep running...

jhawk19 · 10-14-2018, 08:17 PM

Fixed...thanks guys. The fuel tank was still half empty, but once I turned the idle adjust clockwise, it stayed running at a high RPM. I let it run for about 5 minutes, then I shut it off and adjusted the idle back down slightly. I was then able to start it with no choke and it ran beautifully. I took it for a ride and came home, filled the fuel tank and took it for 3 more laps around my neighborhood with zero issues!

WatchDoc · 10-14-2018, 08:40 PM

Great to know, thank you for this information.

roundhouse · 10-15-2018, 07:19 AM

Glad to hear it. Sounds like something I would do.

Ran the battery down once trying to start my hawk. forgot to flip the switch on the handle bar............

timcosby · 10-15-2018, 11:29 PM

Quote:

Originally Posted by jhawk19

Fixed...thanks guys. The fuel tank was still half empty, but once I turned the idle adjust clockwise, it stayed running at a high RPM. I let it run for about 5 minutes, then I shut it off and adjusted the idle back down slightly. I was then able to start it with no choke and it ran beautifully. I took it for a ride and came home, filled the fuel tank and took it for 3 more laps around my neighborhood with zero issues!

you can adjust it with it running too

10-13-2018, 08:50 PM	#1
jhawk19 Join Date: Oct 2018 Location: South Carolina Posts: 32	Fires up, won't stay running. Hello all, I just built my Hawk last night. I took today to change fluids (fresh oil, fork oil, brake fluid) and heat wrap the exhaust and finally to change the front and rear sprockets. I went to fire it up for the first time and it fired right up!! Then it cut off. I can start it with the choke on all three settings, but it won't stay running...it just cuts off after 5 or 10 seconds. I have adjusted the idle screw counterclockwise a few times, but same results... What is my next step?
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10-13-2018, 09:04 PM	#2
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	How much gas in the tank? Is the petcock tail end up ? Fuel line kink free? I know these are basically dumb questions but it's the small details. __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
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10-13-2018, 09:19 PM	#4
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	There's a fuel drain screw at the very very bottom of the carb crack it about 2 turns and catch the fuel draining out, it should have good uninterrupted flow. Not spurts. Flow, spert. __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
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10-13-2018, 09:37 PM	#6
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	I'd pull the plug and see if it's wet or dry? If it's wet it's fouled out. But it's a long shot. __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
	0

10-13-2018, 09:56 PM	#9
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	That might be it __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
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10-14-2018, 09:46 AM	#10
roundhouse Join Date: Sep 2017 Location: N Texas Posts: 706	Did that fix your problem? When it is cold I have to turn mine a couple turns higher to get it going then back it off after a couple of minutes.
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10-14-2018, 08:17 PM	#12
jhawk19 Join Date: Oct 2018 Location: South Carolina Posts: 32	Fixed...thanks guys. The fuel tank was still half empty, but once I turned the idle adjust clockwise, it stayed running at a high RPM. I let it run for about 5 minutes, then I shut it off and adjusted the idle back down slightly. I was then able to start it with no choke and it ran beautifully. I took it for a ride and came home, filled the fuel tank and took it for 3 more laps around my neighborhood with zero issues!
	4

10-14-2018, 08:40 PM	#13
WatchDoc Join Date: Oct 2018 Location: Jupiter, Florida Posts: 9	Great to know, thank you for this information.
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10-15-2018, 07:19 AM	#14
roundhouse Join Date: Sep 2017 Location: N Texas Posts: 706	Glad to hear it. Sounds like something I would do. Ran the battery down once trying to start my hawk. forgot to flip the switch on the handle bar............
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