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Post by gizzcast on Jan 19, 2012 9:53:05 GMT -5
I have a 1971 Elan with a single 250cc that I am able to start but backfires extensively when I press the accelerator. I am using a 50:1 gas mix and also tried a 32:1 mix. Any ideas where to start?
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Post by datasled on Jan 19, 2012 10:14:03 GMT -5
Did you clean your points yet on the old elan?
sounds like it might be a bad condensor possible...
or could even be simply a bad plug? or coil?
i would also check the key ignition harness wire..
Make sure the back is plugged in proper not half plug in ect/..
take it off and replug it in.. look for any broken ground wires,,
Do you have a working tether switch on the sled? does it function proper?
do you have another coil to test or compair?
never over look the plug wires..or better yet the boot!
One other thing to check is your timing it maybe out slightly of wack.. when cleaning your points look at the flywheel key make sure it looks ok and check the advance mechanism on your the fly wheel.. make sure it moves properly..
best i can do start with the easiest things first
i know this seems like a alot .. but you will narrow it down..
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Post by sledrat on Jan 19, 2012 10:36:41 GMT -5
Data yikes thanks man for your post  but thats alot of info dont scare him off lol joking unless your trying to buy the sled off him  GIZZCAST ---> first thing i would do is this simply unplug the ignition carefully.. And see if you have the same problem if it does the same you know your problem is then not in the wiring,, and in the points and magneto area ....if so i would say pull the fly wheel and clean them points! best of luck let us know what happens.. Or if anyone else can chime in please do so.. |
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Post by gizzcast on Jan 19, 2012 14:08:39 GMT -5
Thanks guys. I had a new spark plug but I'm not sure if it's the right one. I will look at your other suggestions. Will keep you posted.
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Post by datasled on Jan 19, 2012 16:32:23 GMT -5
ya no prob at all they dont call me datasled for nothing  |
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g17s
one ski
Posts: 10
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Post by g17s on Feb 6, 2012 17:16:26 GMT -5
get a timing light on it while running if the marks stay steady and smooth everything is good with the points and coil IF they move all over the place, change the condenser. A known good condenser is better than a new one let me know gary
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Post by Timmy on Feb 26, 2012 20:59:13 GMT -5
I have the same type of sled and also experienced the backfiring problem. Swapped out the old plug wire for a new one and adjusted the carb a bit and now it runs just fine. Sometimes will still backfire when its warming up but after a few minutes there's no problem. Id suggest changing the plug wire before you get too crazy.
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Viking
old sled
skoal another skidoo!
Posts: 126
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Post by Viking on Feb 28, 2012 12:19:08 GMT -5
Good advise TIM
I always try the simple stuff first forsure!!!
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SKIBORG
one ski
I RIDE OLD SLEDS DONT LAUGH I OWN THEM
Posts: 36
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Post by SKIBORG on Mar 14, 2012 12:15:29 GMT -5
Also a cheap fix thats is over looked is the spark PLUG boot i dont know how many NGK boots i had that crap out on me,,
yep that small thing caused a Wack of trouble many times.
..If you have another spark plug boot around switch it out see if it runs better....
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