kcrots
Newbie
Hello I'm new to the forum but need some help getting a sled going. I bought a 2006 Nytro last year and it ran great. I fired it up in spring after I changed the oil to make sure that everything was working. I went to turn it over and make sure that everything worked before the snow came and it wouldn't even roll over. I changed the battery and spark plugs and the engine will now turn over but it won't start. I have spark on the spark plugs as I pulled one out and let it spark to the frame so the spark plugs are getting electrical control. There is gas in the gas tank that I can see. It's about 3 gallons. I tried 2-3 times for about 10-15 seconds with the choke open like it's suppose to be and nothing ever fired up the engine. I noticed that there might have been a creature sleeping on top that had chewed some of the foam insulation from the top but nothing else seemed to be damaged. There are no oil leaks, fluid leaks, or anything that I could see below the sled. I'm wondering what the next things are to check. I doubt it's the starting relay if the battery and the starter are trying to turn the engine over. The only other thing I can think is the fuel pump but it was fine a few months ago. Also, the speedometer won't turn on the light doesn't start up either. I had read that those don't actually turn on until the engine is running but I've only seen that in one spot.
I've looked at the other threads and haven't seen anything that was too helpful?
Any thoughts would be great.
I've looked at the other threads and haven't seen anything that was too helpful?
Any thoughts would be great.
The carbed Yamahas are notorious for not starting after sitting for the summer. Carbs drain out. If you search long enough you will find many threads on the topic. There are a couple ways to get the sled started.
Use the vent on the left side of the tank to blow into the tank and pressurize. Once you have done this hold your finger over the vent, turn the choke on and crank over the sled. It should fire.
Another approach is to take the air box cover off and spray a little starting fluid in each carb, turn choke on and crank the sled. You may need to do this two or three times before it will fully prime the carbs and stay running. You will find some members here don't like this method but I know many who use it and have never had any problems.
Make sure the new battery has been charged also. At this time of the year the battery can crank the sled but if not fully charged it may not fire.
Good luck!
Use the vent on the left side of the tank to blow into the tank and pressurize. Once you have done this hold your finger over the vent, turn the choke on and crank over the sled. It should fire.
Another approach is to take the air box cover off and spray a little starting fluid in each carb, turn choke on and crank the sled. You may need to do this two or three times before it will fully prime the carbs and stay running. You will find some members here don't like this method but I know many who use it and have never had any problems.
Make sure the new battery has been charged also. At this time of the year the battery can crank the sled but if not fully charged it may not fire.
Good luck!
kcrots
Newbie
josnow,
Appreciate the recommendations. I did see a little bit more after posting that people do have issue with the carbs and that makes sense. I'll try and see what works.
Appreciate the recommendations. I did see a little bit more after posting that people do have issue with the carbs and that makes sense. I'll try and see what works.
Mph
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Clean the carbs and blow in the tank to get the gas to the carbs and it will fire right up ! I also have a 2006 nytro awesome sleds
smokingcrater
Expert
I don't like to use starting fluid unless I absolutely have to, but a small pump spray bottle with some gas and 2 stroke oil in it works just as well without any negative issues.
Also, I'm assuming you haven't cleaned the carbs? The low speed jets on the carbs are very tiny, and cleaning every fall is a very good idea! You will also want to make yourself a carb balancer out of some tubing and ATF fluid, balanced carbs make starting easier.
SXRider7Hundo
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^^^+1 on carb sync! My Nytro starts just like the fuel injected sleds now!
Metallicat
TY 4 Stroke God
Yep, clean the pilot jets and sync your carbs!
4strokeluvr111
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IMO....REPLACE the pilots....they're cheap. Never know if cleaning them really gets all the junk out of that TEENIE TINY hole.
Redbeard
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I'm quite certain that your fuel line has lost prime. This is the case with my 2008 Vector every fall.
smokingcrater
Expert
thread some monofilament line through it and spin it. That stuff must have a microscopic rough edge or something, because it REALLY seems to scrap the crap off the inside.
hibshman25
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What he said. The carbed vectors always loose prime in offseason and then guys burn up starters cause they keep cranking and cranking. Just pop airbox lid off and mist starting fluid in carbs while cranking til it stays running. Doing this starts them quick and saves the starters.
kcrots
Newbie
When you say blow into the tank to pressurize, is there a specific port to do this on to make sure some fuel gets into the carbs? I want to make sure that I'm pressurizing not through the top entry of the tank. I took a look and didn't see a port on the left hand side as the seat is there? Is there something on the fuel line somewhere?
kcrots
Newbie
Appreciate all of the input. I plan on taking off the carbs and cleaning them because I'm not sure how well they were maintained earlier. Any specific youtube videos that have been particularly helpful for cleaning yamaha mikuni carbs and syncing them?
The vent line is on the left side directly to the right of the secondary when standing on the left side. It's a small rubber line that goes on an aluminum tube, you can't miss it. Take the clamp off, blow in it until pressurized and it will start. Cleaning carbs might be a good idea but you need to learn to do this cause it will be like this every year.
smokingcrater
Expert
First tip is replace every one of the bowl screws with allen head bolts... If the carb hasn't been apart for years, you will probably destroy half of them. Seriously, I think yamaha (or technically mikuni) makes them out of lead!
There are threads on here about syncing, but the 3 cylinders are really easy. Just make a balancer with a board and some ATF fluid.
