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Yamaha superjet 701 back firering

Ski starts runs for short time then breaks down and back fires and stops. Cleaned carbs and set high 1 1/2 low 1 1/4 checked for blocks in fuel lines all good. The ski was sunk and stared after riding but still hasn't run properly after that. Any help would be great thanks.

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  • 32 Answers

Check filters ,check fuel for contamination(water),check air breather system for blockage lube all control cables check choke operation!

Posted on Jan 24, 2013

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Posted on Jan 02, 2017

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SOURCE: missing, back firing just working really bad!

im not certain as i dont have a maintanance manual for that bike, but intake valve clearance should be approx .004 and exhaust valves should be appxox .008 also you may consider taking the coils to a shop and have them tested. coils after warming up will begin to fail once they start to go bad. spark will be great when the bike is cold, but once it warms up, spark begins to fade and hit and miss.. this may be the problem. hope this helps.

Posted on May 21, 2009

  • 1 Answer

SOURCE: yamaha runing rich

http://www.motorcyclecruiser.com/tech/find_carburetion_problems/index.html
Take a look at this web site. Follow their instructions and I'm sure you will be able to fix the problem.

Posted on Jun 09, 2009

  • 3567 Answers

SOURCE: starts and stays running with choke on. stalls

Pay special attention to the parts in red. DO NOT mix parts from the front carb with parts from the back carb. When removing adjuster screws and jets, count the number of turns to remove them, write it down, and replace with the same number of turns.

Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

Go to this site and you can download a free PDF service manual.
www.carlsalter.com/motorcycle-manuals.asp Most all of the manuals are in English but some are not. There is no way to be sure without doing the download. You can always delete it if in a foreign language.
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Posted on Jul 02, 2009

  • 202 Answers

SOURCE: Bike is backfiring through carb.

do u have the correct spark plug the one recommended by the manufacturer

Posted on Aug 02, 2009

  • 5 Answers

SOURCE: carb

i have the same bike you need to remove and clean the pilot jet in the primary side of the carb so it starts and the 2 main jets need cleaned too one is by the pilot jet the other main jet is in that long tube on the bottom of the secondary side of the carb under the YDLS letters

Posted on Apr 04, 2010

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