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Old 01-13-2012, 07:59 AM   #1 (permalink)
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Yamaha Excel III

I have snowmobile for the kids. I don't know the year of the sled to order parts. There is a number on the frame 8Y3000394. can someone help? I have an owners manual that has a number EC340J. the sled has electric start.
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Old 01-13-2012, 08:08 AM   #2 (permalink)
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Your sled should be a 1985 EC340 Excell III
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Old 01-09-2013, 11:03 AM   #3 (permalink)
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1981 yamaha excel 3 startup

the battery in my kids skidoo 1981 yamaha excel 3 is dead. i started it in the summer time, and recently it wont start up. i used the choke(nothing). what is the best way to start this sled without doing damage to the engine?
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Old 01-09-2013, 09:09 PM   #4 (permalink)
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dribble about a soda bottle cap full of premixed fuel down each spark plug hole and fire it up.

your going to want to be sure you have fresh fuel in the tank and then be prepared to clean the carb. of course you may want to charge up the battery if you dont want to pull on the rope.
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Old 01-10-2013, 12:51 PM   #5 (permalink)
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ok, i put gas down the cylinders and it started up but didnt stay running, i tried this 6 times and it wont stay running. what could be the problem?
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Old 01-10-2013, 01:01 PM   #6 (permalink)
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You need to clean the carb.
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Old 01-10-2013, 09:30 PM   #7 (permalink)
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most likely a carb issue, but you may factor in the fuel pump, fuel supply lines, pulse line, vent lines, etc. worst case, crank seals.

do some checking under the hood.
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Old 01-18-2013, 05:44 PM   #8 (permalink)
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1981 yamaha excel 3 problem

hi guys,any suggestions on the problem with my kids skidoo. had it runninggreat last winter, start it up this fall, no problem. now it will start after 10 pulls, but it idles high. when i put the choke back down shes fine. once i start riding, it sounds boggy and not kicking in high speed.it stalls out then wont start until 20 minutes or so. thanks
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Old 01-18-2013, 10:03 PM   #9 (permalink)
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Yamaha Excel III

Clean the carbs


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Old 01-19-2013, 08:44 PM   #10 (permalink)
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The excel III only has one carb, but it sounds like it needs cleaned. It is easer to get the carb out on these if you remove the air box screws first and remove them both.
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Old 02-01-2013, 08:35 AM   #11 (permalink)
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excel3 mixture

my kids skidoo is a 1981 yamaha excel 3, what type of oil should i use to mix the gas with? 2stroke, or 2stroke synthetic oil? fuel type?reg/supreme gas?
thanks
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Old 02-01-2013, 07:20 PM   #12 (permalink)
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Quote:
Originally Posted by leon View Post
my kids skidoo is a 1981 yamaha excel 3, what type of oil should i use to mix the gas with? 2stroke, or 2stroke synthetic oil? fuel type?reg/supreme gas?
thanks
sometimes starting your own thread gets more results, but to answer your questions and these are opinions only, i prefer the semi-synthentic yamalube 2S. non ethanol is your fuel of choice, and although its not needed, if you consider the state of the fuel at hand, most times the 91 octane is your best choice. if your looking at 87 and its already degraded, you may be in trouble. with the 91, even if its a bit on the older side, your ahead of the game for fuel requirements. remember that back when that girl was in her prime the fuel quality was much better than they are these days. a few extra dollars at fill up is still cheaper than pistons and cylinders.
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