ardo Posted August 4, 2009 Share Posted August 4, 2009 Hello everyone, this is my first time posting a question, I am a newbie, forgive me if I could not find what I am looking for in search forum, so here it goes I have a 1980 Yamaha sx400 was not running, (due to sitting for a long time) I pulled the carbs off of the bike went through all the jets, clean them well, and put back on the bike, it ran for a while, but the idle was never consistant, as I rev the trottle sometimes the idle goes up by itself, unpredictably, it has been sitting for few months, lately I started again it starts right away, but as soon as I push the choke in, dies, I also noticed the RPm needle goes up very slow, I am assuming the cable might be on its way out, the boots were not that bad. any suggestions will be highly appreciated. ardo Link to comment Share on other sites More sharing options...
jamax Posted August 4, 2009 Share Posted August 4, 2009 hi with the rev going up on its own,sounds like an air leak.when its running try spraying some wd40 between the carbs and barrels.it should run ok if its an air leak. as far as only running on choke,sounds like your idel jet/s is blocked.did you flush the tank or have a filter in line? ja Link to comment Share on other sites More sharing options...
ardo Posted August 4, 2009 Author Share Posted August 4, 2009 hi with the rev going up on its own,sounds like an air leak.when its running try spraying some wd40 between the carbs and barrels.it should run ok if its an air leak. as far as only running on choke,sounds like your idel jet/s is blocked.did you flush the tank or have a filter in line? ja Hi thank you for your response, I will check both again, I was so sure I cleaned good, but Ill take the apart again, where is a good parts place in case I need the boots Link to comment Share on other sites More sharing options...
Moderator drewpy Posted August 5, 2009 Moderator Share Posted August 5, 2009 Hi thank you for your response, I will check both again, I was so sure I cleaned good, but Ill take the apart again, where is a good parts place in case I need the boots loads on ebay drewps Link to comment Share on other sites More sharing options...
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