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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Still backfires help! /cgi-bin/YaBB.pl?num=1525032538 Message started by kylejang on 04/29/18 at 13:08:57 |
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Title: Still backfires help! Post by kylejang on 04/29/18 at 13:08:57 Hello ! Weather is getting warmer in Toronto. I start to ride so happy. Problem I have now is no matter how I adjust idle mix screw bike always backfiring except with half open choke on. With half open choke - no backfire with choke close - always backfire Both condition is anytime condition when bike is in idle and riding after engine warmed up. So far I replaced spark plug, cleaned carburetor, replaced battery. How can I fix this issue? Thank you for help in advance. |
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Title: Re: Still backfires help! Post by verslagen1 on 04/29/18 at 13:14:14 what jets have you installed? what intake filter do you have? what exhaust do you have? year? mileage? any mods? |
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Title: Re: Still backfires help! Post by kylejang on 04/29/18 at 13:32:00 Everything is stock condition. Mine is 2008 with only 14880 km or 9246 mile. Thanks |
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Title: Re: Still backfires help! Post by batman on 04/29/18 at 23:09:10 1) You may have an air leak in your exhaust header or muffler connection 2) you need to set the idle mix screw properly 3) you need to have the idle speed set at 1000 or more rpm. 4) you need to check your TEV valve for proper operation . Assuming your pilot jet and passage is clean all the causes above except number 1 will cause the fuel /air mix to be to lean for the sparkplug to fire , and the unburned fuel to be pushed into the hot exhaust pipe , by the following exhaust stroke ,where it explodes (backfires).Pulling the choke out makes the fuel mix richer which is the job the TEV should be doing. |
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Title: Re: Still backfires help! Post by kylejang on 04/30/18 at 13:41:15 Thank you advice. If I ride with half open choke all the time what is going to happen? Is it going to damage engine? |
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Title: Re: Still backfires help! Post by verslagen1 on 04/30/18 at 14:32:47 47554049464D424B2C0 wrote:
Before I can answer your last question... What do you mean 'always backfires' ? Are you lurching/bucking? backfires on shift? backfires with turn signal? backfires at idle? backfires at cruising? |
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Title: Re: Still backfires help! Post by batman on 04/30/18 at 15:35:41 Riding with the choke on isn't a great idea , If your bike is backfiring when you close the throttle all the way, leaving the choke pulled out all the time will mean your bike is running rich any time your not at idle. This will allow your combustion chamber and sparkplug to be covered increasingly with soot., fouling the plug (can be cleaned) but could form glowing hot spot in the chamber which may cause detonation (very bad) or the unburned fuel could pass your rings washing oil from them and the cylinder walls causing premature wear. not to mention killing your mileage. The TEV valve on the right side of the carb ,under the small plate with three screws , there is a diaphragm and small spring under that cover . when the throttle is closed the vacuum downstream from it goes high and travels up a passage through a small hole in the "finger" off the diaphragm , defeats the spring pressure opening the valve ,sending extra fuel from the bowl ,down stream of the throttle plate to make the fuel mix richer and prevent misfire, backfire, or stalling . If the diaphragm has holes / cracks (other than the one in the finger) or the passage behind that normal hole is plugged , the valve won't open . You 'll need to clean the passage by spraying carb cleaner or inserting a fine small copper wire ,or both , to make sure it's open .You need to address the problem , not run with the choke on. |
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Title: Re: Still backfires help! Post by cygnet on 04/30/18 at 17:07:07 I had the same problem with mine did the white spacer mod and it fixed the problem. Your just to lean BTW when I did the mod my mileage dropped from 60 mpg to 55 mpg. |
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Title: Re: Still backfires help! Post by kylejang on 04/30/18 at 17:17:50 Thank you . I just went to test drive with turning idle mix screw quarter by quarter from fast idle to slow idle, slow to fast and tried very gentle throttle too. Result is same every time throttle closed then pop pop or pop pop pop backfire and also when I down shift, slow down then backfire. I will try Mr. batman's suggestion. Does backfire will damage engine? |
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Title: Re: Still backfires help! Post by bobert_FSO on 04/30/18 at 18:38:54 Another hint. Make sure your idle speed is not too low. Set it at least to about 1100 rpm. This will help with the pops during shifts. another hint for that is to not chop the throttle shut during shifts and decelerations. Also, check for exhaust leaks at the cylinder to headpipe and headpipe to muffler connections. Air leaks at those locations will suck in air (oxygen) making it easier to ignite unburned fuel in the exhaust system. |
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Title: Re: Still backfires help! Post by batman on 04/30/18 at 21:05:11 backfire occurs in the exhaust ,and should cause no damage ,except maybe hearing loss. ;) |
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Title: Re: Still backfires help! Post by kylejang on 05/01/18 at 14:51:45 How can I check exhaust leaks? What is the best way to modify White spacer? I read forum and too much information. |
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Title: Re: Still backfires help! Post by verslagen1 on 05/01/18 at 15:39:19 697B6E6768636C65020 wrote:
You can check for exhaust leaks on a running engine with a lit candle. wave it around the joints, if it flickers, you have a leak. use wd40 on the intake, if the rpm picks up, you gotta leak. I wouldn't do the white spacer mod until you have the jets right. |
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Title: Re: Still backfires help! Post by kylejang on 05/02/18 at 17:57:22 use wd40 on the intake, if the rpm picks up, you gotta leak. Mr.Verslagen1 Where is intake located? |
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Title: Re: Still backfires help! Post by IslandRoad on 05/02/18 at 19:49:55 091B0E0708030C05620 wrote:
It's the rubber boot/tube where the carb is connected to the engine. |
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