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03-06-2013, 03:44 PM | #2 |
Join Date: Aug 2011
Location: Tierra Azul, NM
Posts: 739
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When does it back fire? Is the carb/intake all stock? What size bbk? Exhaust type? What Have you already tried? I can guess randomly if you prefer it. <- (that was gentle sarcasm)
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Do not fear mistakes. You will know failure. Continue to reach out. - Benjamin Franklin Join the HARDCORE 1983 Honda GL650I SilverWing |
03-06-2013, 03:52 PM | #3 |
Join Date: Mar 2013
Location: los angeles
Posts: 43
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after market exuast. i tried adjusting the carb but no cigar. it only backfired a couple times today when coming home from school. but it never has befor. bbk size 72cc. checked vacuum lines everything seems good. the only thing i can think of is the jet i only have an 86. maybe too small.
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03-06-2013, 03:59 PM | #4 |
Join Date: Aug 2011
Location: Tierra Azul, NM
Posts: 739
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Have you checked to see what color your plug is? Does it backfire when you close the throttle or open it? Did you move the needle when you "adjust the carb"? If not, if you think it's too lean or plug says it is try lifting the needle (move the clip down a notch) see if it improves. How many notches are on your needle? try adjusting it on the needle until you notice a change for the better. You may need to rejet but tuning with the needle will give you a better indication as to which way you should go. Do a plug chop and post the results for the best advice.
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Do not fear mistakes. You will know failure. Continue to reach out. - Benjamin Franklin Join the HARDCORE 1983 Honda GL650I SilverWing |
03-06-2013, 04:49 PM | #5 |
Join Date: Sep 2011
Location: staunton va
Posts: 319
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do you have a performance cdi that will cause backfiring also, your jet should be fine but to rule that out you can go up the next size
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2010 Cpi Oliver 70cc, naruku trans kit, downhill handle bars, tecnigas rsll pipe, s6 4g rollers, Vento R4 with 90cc 1e52qmf technigas next r 100cc pipe Naruku, 21mm race carb, s6 4.5 g rollers |
03-06-2013, 05:31 PM | #6 |
Join Date: May 2012
Location: missouri
Posts: 164
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my exhaust will pop sometimes, does it pop or actually backfire, all the cheaper exhaust i've put on pop every so often because they are cheap and leak from the rivets.
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B.A.M.F. tapout scoot 24mm carb 150cc intake performance exhaust A9 cam hoca big valve head 16/50 gears 9.25 gram dr pulley sliders koso variator 1.5k torque spring orange coil orange unlimted cdi uni filter gates premium belt 2012 taotao vip cy50a scrappys 110cc big bore kit 52mm "88cc" 100 main jet 38 idle iridium plug custom paint, leds and decals alarm system naraku hd crankshaft |
03-06-2013, 06:19 PM | #7 |
Join Date: Mar 2013
Location: los angeles
Posts: 43
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wont start now any ideas. moved the needle up had to make a groove because it didnt have one. more of a pop millsc. good to hear from you on this new site you always give good advice.
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03-06-2013, 06:38 PM | #8 |
Join Date: Aug 2011
Location: Tierra Azul, NM
Posts: 739
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Bummer check the plug is it wet after a period of cranking? Check spark, fuel, and pray its one of those. When was the last valve check??
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Do not fear mistakes. You will know failure. Continue to reach out. - Benjamin Franklin Join the HARDCORE 1983 Honda GL650I SilverWing |
03-06-2013, 06:53 PM | #9 |
Join Date: Mar 2013
Location: los angeles
Posts: 43
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i adjusted the valves about a month ago. ill be back in a minute
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03-06-2013, 07:04 PM | #10 |
Join Date: Mar 2013
Location: los angeles
Posts: 43
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ok im getting a spark how do i check for fuel.
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03-06-2013, 07:11 PM | #11 |
Join Date: Aug 2011
Location: Tierra Azul, NM
Posts: 739
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there are at least 2 ways. There is a screw on the bottom of the float bowl generally, unscrew it and see if fuel leaks out (sometimes there is a hose attached under there and the fuel will leak out the hose) Also pull the fuel inlet line it should have fuel depending on where your tank is located it will flow freely or trickle. If your tank is floor mounted check to make sure the pump works by cranking it while the line is disconnected it should squirt fuel. Some gravity feed tanks have a vacuum pet cock that works similarly.
You can also try artificially introducing fuel into the carb mouth to see if fires and runs for a moment. If it does it definitely has a fuel issue...
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Do not fear mistakes. You will know failure. Continue to reach out. - Benjamin Franklin Join the HARDCORE 1983 Honda GL650I SilverWing |
03-06-2013, 07:24 PM | #12 |
Join Date: May 2012
Location: missouri
Posts: 164
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unplug the fuel hose that goes to carb, then unplug the hose on the manifold suck on the hose you unhooked from the manifold gas should come out the fuel hose that you unhooked from the carb, if it doesn't the petcock is bad or clogged
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B.A.M.F. tapout scoot 24mm carb 150cc intake performance exhaust A9 cam hoca big valve head 16/50 gears 9.25 gram dr pulley sliders koso variator 1.5k torque spring orange coil orange unlimted cdi uni filter gates premium belt 2012 taotao vip cy50a scrappys 110cc big bore kit 52mm "88cc" 100 main jet 38 idle iridium plug custom paint, leds and decals alarm system naraku hd crankshaft |
03-06-2013, 07:27 PM | #13 |
Join Date: May 2012
Location: missouri
Posts: 164
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mine pops sometimes, my plug looks good and my scoot runs great so i ignore it.
__________________
B.A.M.F. tapout scoot 24mm carb 150cc intake performance exhaust A9 cam hoca big valve head 16/50 gears 9.25 gram dr pulley sliders koso variator 1.5k torque spring orange coil orange unlimted cdi uni filter gates premium belt 2012 taotao vip cy50a scrappys 110cc big bore kit 52mm "88cc" 100 main jet 38 idle iridium plug custom paint, leds and decals alarm system naraku hd crankshaft |
03-06-2013, 07:29 PM | #14 |
Join Date: Mar 2013
Location: los angeles
Posts: 43
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ok well i unplugge the hose on the petchcockfrom the fuel filter and after the gas spilled out plugged it back together and its running fine so in guessing this is some sort of fuel problem. why would that fix it. any ideas?
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03-06-2013, 07:30 PM | #15 |
Join Date: May 2012
Location: missouri
Posts: 164
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read my post on how to check for fuel and do that your petcock most likely was clogged sucking on the hose unclogs it most of the time
__________________
B.A.M.F. tapout scoot 24mm carb 150cc intake performance exhaust A9 cam hoca big valve head 16/50 gears 9.25 gram dr pulley sliders koso variator 1.5k torque spring orange coil orange unlimted cdi uni filter gates premium belt 2012 taotao vip cy50a scrappys 110cc big bore kit 52mm "88cc" 100 main jet 38 idle iridium plug custom paint, leds and decals alarm system naraku hd crankshaft |
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