1980 Yamaha XS 400 Special Logo
Anonymous Posted on Aug 13, 2010

1980 Yamaha XS 400 Special First, How do you tell if it has an electronic ignition? Second, Can't get it to start. Have put gas in spark plug holes. Didn't hit. Bike has been setting on a dirt floor building sense 1988. Change oil and filter, cleaned out fuel tank, install fuel filter. Took off the 2 carbs, cleaned and checked..didn't soak it in carb cleaner.The carb rubber mounts are cracked on the outside, but look ok on the inside. Any help in what to do to try and get this motor to try to start and run. Thanks, Mike

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tombones

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  • Master 3,567 Answers
  • Posted on Aug 13, 2010
tombones
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First, you need a good battery. The bike does have electronic ignition. Soak the carbs in denatured alcohol for two hours after removing the float bowls, then clean with spray cleaner. Spray into every large and small hole you can find. Remove the rubber diaphragm from the center of carb prior to cleaning. New diaphragms are $196 each. Check all fuses. Put in new spark plugs, NGK-BP7ES. Clean the air filter. Get a can of spray starter fluid and spray on the air filter. The rubber mounts for the carbs are likely to be a problem once it gets running. It looks like they are still available at Babbitt's, $53 each. If un-carburetored air can get into the joints it will lean the fuel mix and cause uncontrollable high idle.

Before you sink a lot of money into the bike, check for spark. If spark is present, coast the bike down a good sized hill without any spark plugs being installed. Put the bike in 3rd gear as you go downhill then let the clutch out to turn the engine over. Now ( using the clutch lever ), shift through all the gears then neutral. If the bike will not shift properly it likely has a bent shift fork. I can't find any forks avaiable. With a bad tranny I would put it back in the dirt floor building and find a newer bike. Here is a link to Babbitt's. Please rate my answer. Thanks.
www.babbittsonline.com/pages/parts/viewbybrand/default.aspx

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  • tombones Aug 13, 2010

    You might also try www.bikebandit.com for parts. The site is not as easy to use as Babbitt's but could serve as a second source. They don't have shift forks either.

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