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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Backfire /cgi-bin/YaBB.pl?num=1252306201 Message started by maephisto on 09/06/09 at 23:50:00 |
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Title: Backfire Post by maephisto on 09/06/09 at 23:50:00 Is it normal for the engine to backfire if i stop the engine with the choke pulled out ? |
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Title: Re: Backfire Post by Routy on 09/07/09 at 05:46:06 7F7377627A7B61667D120 wrote:
I don't know why you would stop the engine w/ the choke pulled out. But mine sneezes....snorts when I turn off the key,....w/ the choke pushed in. I guess you could call it a "backfire", but not like it does when decellerating from hi R's. |
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Title: Re: Backfire Post by maephisto on 09/07/09 at 06:07:13 717E647F636576747C7265170 wrote:
I don't know why you would stop the engine w/ the choke pulled out. But mine sneezes....snorts when I turn off the key,....w/ the choke pushed in. I guess you could call it a "backfire", but not like it does when decellerating from hi R's.[/quote] it's like a gun shot loud enough to freak out a block...I usualy ride with the choke pulled out... |
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Title: Re: Backfire Post by verslagen1 on 09/07/09 at 07:11:22 262A2E3B2322383F244B0 wrote:
It's not good to ride with the choke pulled out after the normal warm up period. The extra gas tends to wash the oil off the cylinder walls. Now of course if your bike is so lean that having the choke out to make it run right is a sure indication of a problem that needs fixin'. 1st, I don't know what year your bike is, or how many miles it's got or if you're capable of turning a wrench... so easiest steps 1st. Drain the carb, fill it with seafoam, let sit overnight. Drain, pour into the tank with reasonably fresh gas. And see how that goes. Do you have the brass plug pulled over the idle mixture screw? if you do, 1/8 to a 1/4 turn rich CCW to tame the howitzer blast down to a most comical poof in comparison. Take your adjustments slow, and you'll learn from each one. one more question, did you change anything in the exhaust or intake? |
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Title: Re: Backfire Post by maephisto on 09/07/09 at 07:26:17 746770716E6365676C33020 wrote:
It's not good to ride with the choke pulled out after the normal warm up period. The extra gas tends to wash the oil off the cylinder walls. Now of course if your bike is so lean that having the choke out to make it run right is a sure indication of a problem that needs fixin'. 1st, I don't know what year your bike is, or how many miles it's got or if you're capable of turning a wrench... so easiest steps 1st. Drain the carb, fill it with seafoam, let sit overnight. Drain, pour into the tank with reasonably fresh gas. And see how that goes. Do you have the brass plug pulled over the idle mixture screw? if you do, 1/8 to a 1/4 turn rich CCW to tame the howitzer blast down to a most comical poof in comparison. Take your adjustments slow, and you'll learn from each one. one more question, did you change anything in the exhaust or intake?[/quote] the bike is a '98 all standard, no mods. about 31000km...that's about 19000 miles. it runs fine with the choke in, but i liked it better with it pulled out. it sounds and feels better... |
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Title: Re: Backfire Post by verslagen1 on 09/07/09 at 07:54:41 74787C6971706A6D76190 wrote:
rejet, it'll be better for the bike. |
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Title: Re: Backfire Post by Rocco on 09/07/09 at 10:53:55 i saw backfire and just to do it POP POP POW!!! with the debaffled sporty muffler on now it's more like a roar and tank shot! i'll be rejetting soon though, hopefully it doesn't take away too much of the warning shots ! ;D |
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Title: Re: Backfire Post by FreeSpirit on 09/07/09 at 11:01:43 I kinda like the backfire now that I heard it helps scare the deer out of the road ;D Just thought I'd mention that benefit. |
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Title: Re: Backfire Post by photojoe on 09/07/09 at 13:52:21 I felt pretty bad yesterday when the backfire made a young girl standing on the sidewalk jump and scream. Not my intention, but scared the shite out of her. Hey.....it happens. |
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Title: Re: Backfire Post by twdy on 09/07/09 at 16:04:30 a little off topic... but do you guys have any tips on making her backfire on command? she sometimes does when i drop from 3rd to second on a decel.. |
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Title: Re: Backfire Post by John_D on 09/07/09 at 16:43:54 484B58453C0 wrote:
Absolutely! Just tap the kill switch off, then on again, while under slight acceleration. POW! :o ;D |
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Title: Re: Backfire Post by boofer on 09/07/09 at 19:51:23 twdy, Since I live in the country and all my neighbors hunt and shoot guns like I do, I often announce my homecoming with a backfire. I just pull into my shed and blip the throttle. As rpms rise, just hit kill switch. Rpms dictate sound from .410 guage to 12 ga duck loads. Would not do it in town, but nearest house is 200 yds away. Boofer |
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Title: Re: Backfire Post by justin_o_guy2 on 09/07/09 at 19:54:13 I have a harder time flicking the kill off & on & keeping the throttle right, so I drop the heel onto the sidestand a bit, its a lot easier for me & I can do it & no one can see my hand,, just looks like an honest backfire. I did that while 2 cops were on a call & in someones front yard,, Skeert the hayull outta those guys.. |
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Title: Re: Backfire Post by marine5317 on 09/07/09 at 20:01:17 It might sound good using the kill switch, but remember when you use the kill switch with it still running you are washing the oil film off the cylinder wall with unburned gas. Ride Safe Marine5317 |
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Title: Re: Backfire Post by boofer on 09/07/09 at 20:24:15 marine5317, Good point. Boofer |
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Title: Re: Backfire Post by John_D on 09/08/09 at 01:36:11 7D64616A7F64603E3E3A3C390D0 wrote:
I imagine the same applies to the kickstand kill also. :-/ As fun as it may be, it's not something I do often. It is fun to do in a tunnel though! ;D |
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Title: Re: Backfire Post by 4carbcorvair on 09/08/09 at 07:00:32 Mine used to run better with the choke pulled out to the first notch. Sure sign of running lean. I installed a Dyna muffler, which I do get complimented on the sound. This exagerated the lean issue further, not good. Header pipe started to blue. I rejetted one size up to a 150, up on the pilot and 3 washers in place of the spacer. I would have to say that with this exhaust and the carb mods, it is set perfect. No black soot. RARELY a backfire/puff/fart, whatever you want to call it. Not to mention the increase in power. Went on a ride this weekend and actually stayed on an 1100 crotch rockets back tire up to about 80/85 mph. Lets just say that the others I went with were definately impressed with my lil 650 single. :) Rejet and forget. :) |
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Title: Re: Backfire Post by jabman on 09/09/09 at 01:44:12 so is the puff on shut down normal or is it a symptom of something? |
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Title: Re: Backfire Post by justin_o_guy2 on 09/09/09 at 07:13:17 A well tuned engine rumbles & grumbles, a Poof sometimes at shutdown is nothing. As long as it doesnt sound like a gunshot. |
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Title: Re: Backfire Post by JustPassinThru on 09/14/09 at 22:40:12 3A23262D38232779797D7B7E4A0 wrote:
Not only that...you're pumping unburned, relatively COLD, gas and air past the red-hot exhaust valve and porting. It's a good way to damage the engine if done regularly. Best way, the ONLY way, to kill it, is to let it down to idle and then kill the ignition. If I could find a way to shut it down with fuel or load, without wearing the clutch or waiting for the carb bowl to run dry, that's how I'd do it. As for backfires...mine sounds like a gang war on deceleration. And EVERY time I shut it down...the engine winds down, there's a half-second of absolute silence...and then, either a >pop< or a BANG!, of various intensity. Sometimes amusing, sometimes embarrassing, generally annoying. |
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Title: Re: Backfire Post by Mattdw on 09/15/09 at 08:25:24 0A35333410213333292E14283235400 wrote:
to kill mine, "bang free", I simply hold the front brake, bike in 1st, and slowly let out the clutch until she dies....never had a backfire once.... anyone see why that method would cause any problems/damage? Not only that...you're pumping unburned, relatively COLD, gas and air past the red-hot exhaust valve and porting. It's a good way to damage the engine if done regularly. Best way, the ONLY way, to kill it, is to let it down to idle and then kill the ignition. If I could find a way to shut it down with fuel or load, without wearing the clutch or waiting for the carb bowl to run dry, that's how I'd do it. As for backfires...mine sounds like a gang war on deceleration. And EVERY time I shut it down...the engine winds down, there's a half-second of absolute silence...and then, either a >pop< or a BANG!, of various intensity. Sometimes amusing, sometimes embarrassing, generally annoying.[/quote] |
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Title: Re: Backfire Post by kel30734 on 09/15/09 at 08:46:32 I use my back fire to make Traffic Cops Wake up on the morning commute. there is a bridge I go over way out in the country and every now and a gin i will catch Barny Fife and Enus asleep in the car.... ease on by the and CAPOW there awake and cleaning their draws out.... I love my Thumper :o |
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Title: Re: Backfire Post by Mattdw on 09/15/09 at 08:47:55 to kill mine, "bang free", I simply hold the front brake, bike in 1st, and slowly let out the clutch until she dies....never had a backfire once.... anyone see why that method would cause any problems/damage? |
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Title: Re: Backfire Post by JustPassinThru on 09/15/09 at 10:21:41 444D5E414C485D4647290 wrote:
Wear on the clutch. I don't know how hardy that clutch is...it might not be an issue; or it might destroy it over time. |
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