2006 Roketa DB-06 Adjustment Back fireing

MGrowe · 06-29-2009, 02:47 PM

Hello All,
Just got a bike from a friend $500.00. I was told that it was a 2006, the bike has gold shocks on the front wheels. My issues with the bike that I have be fighting with, when i give the bike gas it boggs down and back fires.(pop) what should I be adjusting the air to gas mix or the timming? any help would be great!!!!!!!! :?

DesertDog · 06-29-2009, 04:53 PM

by adj. the air fuel will eliminate it in most cases, some times it could be valves , they might need adj. or a combo of all
best of luck

katoranger · 06-29-2009, 05:29 PM

Make sure you don't have any air leaks between the carb and the cylinder head. The plastic/rubber intake manifold may have a crack in it allowing a lean condition. Check the exhaust to head connection also.

Does it idle well? If it idles, but won't rev you may have a plugged main jet in the carb.

Allen

TheRealWorld · 06-29-2009, 06:32 PM

If those suggestions don't work, give us more info. It is not your timing. It could be a bad plug, or a loose plug, and check the plug wire to be sure it is not touching the exhaust pipe. Does fuel flow easily and fast out of the carb drain? The bottom screw on the carb is a drain, to drain the bowel of the carb, turn it counter clockwise and catch the fuel that drains out from a tube visible under the bike. See if it has water or junk. Also be sure you don't have a plugged gas tank vent.

How many miles are on the bike?

MGrowe · 06-29-2009, 08:10 PM

Thank you all for the ideas! I did clean the carb out with cleaner twice, the bike does idle well but when giving gas. The bike only has 150 miles on it.

DesertDog · 06-29-2009, 10:42 PM

do u know if the person that had it back fired on him ? probly !

take carb off one more time and that should do it........... :?:

just kidding.. do you know the jet size (main) 89mm , 95mm , 105mm, and so on, any one of those , none the less try and go down in size first , 1 size at a time see if it gets worse or better , if not go up 1 size and see if it gets worse or better,

before you do all that have you checked the throttle needle position yet

katoranger · 06-29-2009, 11:11 PM

Idles, but bogs. Is the choke working properly? Maybe it is sticky and staying shut.

It won't hurt to change the spark plug to a new NGK. Sometimes a sparkplug will work at light loads, but not when put under load.

Allen

Cal25 · 06-30-2009, 09:45 AM

Bike has only 150 miles on it? Is the gas fresh? Old stale gas can cause lots of problems.

katoranger · 06-30-2009, 12:43 PM

Quote:

Originally Posted by Cal25

Bike has only 150 miles on it? Is the gas fresh? Old stale gas can cause lots of problems.

Didn't think of that.

Get rid of the old gas if it is still in there.

Allen

MGrowe · 06-30-2009, 08:10 PM

I did drained the old gas. Thank you all for the ideas,When the rain stop im will work on the issue agen.

katoranger · 06-30-2009, 09:27 PM

One thing eliminated at least.

I would try the easy to change spark plug.

Allen

phil · 06-30-2009, 11:25 PM

if you want to cheat, and i know i sound like a broken record here, but try some 100 low lead, it will clean everything out and if you have a jetting problem it will hide it, and in my opinion is better for the bike, but it will eat away the fuel line but then so will regular gas. all you need is a small airport, jug, and some cash. well worth a try

06-29-2009, 02:47 PM	#1
MGrowe Join Date: Jun 2009 Location: Tarpon Springs, FL Posts: 3	2006 Roketa DB-06 Adjustment Back fireing Hello All, Just got a bike from a friend $500.00. I was told that it was a 2006, the bike has gold shocks on the front wheels. My issues with the bike that I have be fighting with, when i give the bike gas it boggs down and back fires.(pop) what should I be adjusting the air to gas mix or the timming? any help would be great!!!!!!!! :?
	0

06-29-2009, 04:53 PM	#2
DesertDog Join Date: Apr 2008 Posts: 782	by adj. the air fuel will eliminate it in most cases, some times it could be valves , they might need adj. or a combo of all best of luck __________________ DesertDog
	0

06-29-2009, 05:29 PM	#3
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	Make sure you don't have any air leaks between the carb and the cylinder head. The plastic/rubber intake manifold may have a crack in it allowing a lean condition. Check the exhaust to head connection also. Does it idle well? If it idles, but won't rev you may have a plugged main jet in the carb. Allen __________________ You meet the nicest people on a Honda Clone.
	0

06-29-2009, 10:42 PM	#6
DesertDog Join Date: Apr 2008 Posts: 782	do u know if the person that had it back fired on him ? probly ! take carb off one more time and that should do it........... :?: just kidding.. do you know the jet size (main) 89mm , 95mm , 105mm, and so on, any one of those , none the less try and go down in size first , 1 size at a time see if it gets worse or better , if not go up 1 size and see if it gets worse or better, before you do all that have you checked the throttle needle position yet __________________ DesertDog
	0

06-29-2009, 11:11 PM	#7
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	Idles, but bogs. Is the choke working properly? Maybe it is sticky and staying shut. It won't hurt to change the spark plug to a new NGK. Sometimes a sparkplug will work at light loads, but not when put under load. Allen __________________ You meet the nicest people on a Honda Clone.
	0

06-29-2009, 06:32 PM	#4
TheRealWorld Join Date: Jun 2008 Posts: 817	If those suggestions don't work, give us more info. It is not your timing. It could be a bad plug, or a loose plug, and check the plug wire to be sure it is not touching the exhaust pipe. Does fuel flow easily and fast out of the carb drain? The bottom screw on the carb is a drain, to drain the bowel of the carb, turn it counter clockwise and catch the fuel that drains out from a tube visible under the bike. See if it has water or junk. Also be sure you don't have a plugged gas tank vent. How many miles are on the bike?
	0

06-29-2009, 08:10 PM	#5
MGrowe Join Date: Jun 2009 Location: Tarpon Springs, FL Posts: 3	Thank you all for the ideas! I did clean the carb out with cleaner twice, the bike does idle well but when giving gas. The bike only has 150 miles on it.
	0

06-30-2009, 09:45 AM	#8
Cal25 Join Date: Feb 2008 Location: Terrell and Grapevine Tx. Posts: 1,585	Bike has only 150 miles on it? Is the gas fresh? Old stale gas can cause lots of problems.
	0

06-30-2009, 08:10 PM	#10
MGrowe Join Date: Jun 2009 Location: Tarpon Springs, FL Posts: 3	I did drained the old gas. Thank you all for the ideas,When the rain stop im will work on the issue agen.
	0

06-30-2009, 09:27 PM	#11
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	One thing eliminated at least. I would try the easy to change spark plug. Allen __________________ You meet the nicest people on a Honda Clone.
	0

06-30-2009, 11:25 PM	#12
phil Join Date: Jun 2008 Location: wise va Posts: 636	if you want to cheat, and i know i sound like a broken record here, but try some 100 low lead, it will clean everything out and if you have a jetting problem it will hide it, and in my opinion is better for the bike, but it will eat away the fuel line but then so will regular gas. all you need is a small airport, jug, and some cash. well worth a try __________________ halls auto l coolster, modcycles, yanmar & zongshen, dealer fired roketa,lifan and jet moto and apollo quit me who's next
	0