Couple questions!

tyl4r

tyl4r

New member
Joined
Oct 3, 2006
Messages
47
Age
37
Location
New Hampshire
After riding my SXR 600 this weekend, I started to notice that it would backfire randomly when pull starting it. It's a rather loud backfire and its starting to scare people around me. Anyone know why this would happen? Also, I bought a blue headlight cover off denniskirk.com, will i be able to see fine at night? It says its not intended for night use but Ive seen yellow ones work just fine at night. And lastly, Ive ordered a blue windshield and blue headlight cover, cosmetically, what can i do to make this machine look a little meaner?
 
"Its starting to scare people" Thats too funny!!
I would intall the head light cover with some good Velcro , I dont think you'll be able to see very well with it on at night. Also , I think it may get you a ticket in some areas.
Not sure about the backfire when starting, my 700 backfires when i shut it down if I dont let it Idle down for a few seconds.I think it just collects unburnt fuel in the pipe.
 
I've got a blue headlight cover but I would never use it at night. I only use it during good lighting conditions, never if it is snowing or reduced visability it's just too dark.
 
i would check the carbs and see if they need cleaning, and also your adjustments. My sled did the same thing this year till I cleaned the carbs.
btw I see you from NH, me too. where do you ride?

shawn
 
The backfire while starting it is possibly from a leak in one of the exhaust gaskets. I'd check the donut type gasket right after the y-pipe and make sure it is in good shape.

Besides that I'm only guessing. Mine used to backfire after I started it before it warmed up and I tried to drive it. It fouled plugs back then as well. I replaced the gasket and made sure the carbs were in perfect condition.
 
I live in Epping NH...was just up at the Town and Country in Gorham this past weekend. Maybe I will wait until the end of the season and have the dealership check the carbs and stuff when they "summerize" the sled. And yes, people seem to think they are getting shot when it backfires hahah
 
I live in the lakes region, and race mostly on the lakes. Hows the trails down that direction? most of the snow here is gone! looks like a mud trail. if it is your carbs you should clean them or get them cleaned asap. you don't want to blow up your sled! they are real easy to clean, the longest time spent will be taking them out of the sled. I just did it myself for the first time this year, it was easy. I didn't want to spend another 200 bucks at the dealer! just keep all parts with their respective carbs. soak in carb cleaner, blow out with compressed air, reassemble. Easy. give it a try, your sled will run better and thank you.

Shawn
 
ahhh, yeah im not really mechanically inclined hehe, so i stray away from trying to work on motors. I could try it I suppose, but not even my stepdad knows his way around a sled engine. There really are no "trails" down this way, just the old railroad beds, which are pretty much mud at this point. Headin up to Salem/Rangeley Maine this weekend to squeeze out some last miles. Up to like 520 so far this winter.
 
yup something isn't kosher in those carbs, or you have a bad plug. No point in cleaning the carbs before summer storage though, they will need to be cleaned again when you pull back out in fall. Doing the carbs on these is easy. Pull your airbox and pull the carbs off and we can walk you through it.
 
My VMax 600 has done that for as long as I can remember. It does it more often when my wife drives it. It is worse when going from a long hard run and then quickly shutting it down. I doesn't do it if it is allowed to idle a few seconds before it is shut down. I have had the dealer clean and adjust my carbs every year and the exhaust dounuts that have gone bad have been replaced.

The worst time for it to happen is when your in the middle of a crowd of ski-doos or cats. They all point, chuckle and say "thats a yamaha for ya"
 
Yeah, it seems to love doing it at Gas stations, which makes a really loud echo and then I get about 7 people staring at me like I just shot a shotgun into the air. hahaha. Oh, and my low blue windy comes in today along with my headlight cover...what else can i do to make this sled look mean?
 
a word of caution

FYI continued backfiring can cause your case reeds to crack or break. If it backfires hard enough it can even bend your crank if it hasn't already which will cause even more issues and cost more money to fix.
Possible causes are bad plugs, problems with carbs, timing changes, bent crank (one or more cylinders out of phase with the other cylinders) or damaged reeds.

Mills
 
If you find that your carbs are nice and clean, then you are probably just not letting it idle down long enough after a hard run. Also could be too rich of a pilot circuit, or even the needles if you were just on the needles and worked it hard.
 
I agree about the idling down and a rich pilot. Its basically burning extra fuel in the exhasut. However, my deluxe used to do it when it was cold and it was lean pilots.

On a similar note if you ever have a four stroke with open headers or a lound exhaust wind it up full song wide open hit the kill swith and leavet the trottle wot. Just about the time you stop rolling turn it back on it will flame and backfire something fierce. As teenagers we had a old postal jeep with a slant 4 and a powerglide. It would throw a 3 foot flame easy.
 
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