SuzukiSavage.com /cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Explosion /cgi-bin/YaBB.pl?num=1155765043 Message started by ohms on 08/16/06 at 14:50:43

Title: Explosion Post by ohms on 08/16/06 at 14:50:43 Hey guys, I dont know what the hell is going on now, but sometimes not all the times when i start the bike a huge explosion goes off, i guess a big backfire. It is extremely loud. The first time I my ears were ringing. The second time was more embarrasing :o. The bike runs perfectly otherwise, just this huge bang on startup. Not sure what could be causing this, the bike doesnt backfire while riding or when i turn it off. Any ideas?

Title: Re: Explosion Post by Trippah on 08/16/06 at 19:14:53 A little more info, such as year and milage on bike.  Obvious first thought is too much fuel/too rich in carb on start up. Does it crank several times or a lot before firing?? That kind of info.  As Sherlock would then say..the games' afoot.

Title: Re: Explosion Post by Brendan on 08/16/06 at 20:25:57 Mine does it upon shut off, sounds just like a firecracker going off!  The weirdest part is that sometimes it will do it 3 or 4 seconds after the engine has stopped turning over.  Like yours my bike runs perfectly, starts first throw and NEVER backfires when running. Im going to adjust the pilot circuit as per the instructions found on this site.  That should fix it.  As for yours Im not too sure...sorry!

Title: Re: Explosion Post by sluggo on 08/16/06 at 23:20:25 it's just announcing it's presence.  ;D

Title: Re: Explosion Post by Fat Bastard on 08/17/06 at 00:35:08 Same here.. (somtimes)when I push the start button it sounds like a really loud gunshot.. (button in = PAAAAAANG)   ... It backfires a bit when I drive down slopes but not much and nothing at shutoff.. (sometimes a pathetic "Buuff" and that doesn't count as a backfire)    ...   The strange thing is that before I installed a SE muffler it didn't do this at startup... but at shutoff...  so after the SE mod the PAAAAANG moved from shutoff to startup. Why?   and with the original muffler it backfired more when driving.....    I have not done anything to the carb... but I'm sure that previus owner did.. I also put in a new sparkplug (normal heat range) when I put the SE on. 1997 .  40000 KM

Title: Re: Explosion Post by ohms on 08/17/06 at 04:10:49 Well its a 96 about 16000 kms. I put on a jardine pipe and the carb is rejetted to 152.5 main and 55 pilot. The spacer mod is done as well. I have a K&N drop in as well. I farted around with this for ages already trying to get the right mix and right jets backfiring here there. Mustve swapped the jets 20 million times fixed header leaks, muffler leaks, intake boot leaks. It's been one long ordeal. Just when u think its running great now, I get this BANG!! I normally use the choke to start and it starts very easily. But there was time when i would have to crank it for ages b4 it would start.  Perhaps its too rich in the carb possibly?  :-/

Title: Re: Explosion Post by Dynobob on 08/17/06 at 05:30:35 ohms wrote: I normally use the choke to start and it starts very easily. But there was time when i would have to crank it for ages b4 it would start.  Perhaps its too rich in the carb possibly?  :-/ Mine starts with little or no choke most the time. I've never had a bang starting or stopping. I do get just a little popping while riding. I would think you're lean, not rich. 152.5 isn't very big with a Jardine and a K&N.

Title: Re: Explosion Post by Brewbrother on 08/17/06 at 15:32:42 Dynobob wrote: Mine starts with little or no choke most the time. I've never had a bang starting or stopping. I do get just a little popping while riding. I would think you're lean, not rich. 152.5 isn't very big with a Jardine and a K&N. I did not know that the main jet had any effect on starting the bike. Doesn't the main jet control 3/4 to WOT?? I'd look to air leaks for a backfire on start up. Specifically the intake boots.

Title: Re: Explosion Post by Savage_Rob on 08/18/06 at 06:23:21 When I had the stock Mikuni carb, mine ran best with a 152.5 main and a 55 pilot - but I had a MAC instead of a Jardine.

Title: Re: Explosion Post by PA KID on 08/18/06 at 12:12:49 I have a jardine pipe with a 155 main an 55 pilot. Make sure your carb is tight to the head and gasket is in good shape.You did say you had it off alot.Might wanna check the plug to see what color it is.

Title: Re: Explosion Post by Trippah on 08/18/06 at 13:38:09 I'm really just guessing, but as I mentioned earlier, in fuel causes, too much fuel could cause a bang.  Of course, electrical issues could be timing, or a predetonation- maybee the spark plug given the mods to the carb??  Please keep us posted, we wrench vicariously :D

Title: Re: Explosion Post by ohms on 08/18/06 at 19:12:01 Well I havent done anything but im thinking it might be fuel related. I have noticed that the bike starts very easily without the choke. I have ridden it now for a few days and decided not to use the choke on startup, I figured if it gave problems then I would try the choke. So far no big bang. Maybe the choke was enriching things too much, thats just my guess im still learning. 8) Thanks for the help everyone.

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