Guest VF500FInterceptor Posted August 31, 2013 Share Posted August 31, 2013 Im in the middle of syncing my carbs and it still is not running real great. Wondering if the air fuel mixture is off. What is standard on these bikes? Sent from my XT907 using Tapatalk 4 Link to comment Share on other sites More sharing options...
VFRBert Posted September 1, 2013 Share Posted September 1, 2013 http://www.manualedereparatie.info/en/download/honda-vf-500-c-500-f-1984-1985-Service-manual-intretinere.html This manual has the right answer. Link to comment Share on other sites More sharing options...
Guest Posted September 3, 2013 Share Posted September 3, 2013 I actually have that manual. I searched and searched but could not find the right air fuel mixture. Am I just blind? Link to comment Share on other sites More sharing options...
Member Contributer YoshiHNS Posted September 3, 2013 Member Contributer Share Posted September 3, 2013 What is going on with your sync that the bike isn't running right? What's "not running right"? Link to comment Share on other sites More sharing options...
VFRBert Posted September 3, 2013 Share Posted September 3, 2013 I checked a Dutch forum, mixcture screws 2,5 turns open. Link to comment Share on other sites More sharing options...
Guest Posted September 10, 2013 Share Posted September 10, 2013 Im in the middle of syncing my carbs and it still is not running real great. Wondering if the air fuel mixture is off. What is standard on these bikes? Sent from my XT907 using Tapatalk 4 Air fuel mixture and synchronization are entirely different beasts, each with their own set of symptoms that in some ways appear to mimic each other. Synch pertains to the positions of the individual throttle plates relative to each other. If one is a teensy bit more open than its neighbors it'll throw the vacuum off and result in a tug-of-war. You'll see unstable and slow/hesitant return to idle, revs hanging high between gears, and the idle will tend to rise uncontrollably as the bike warms up. If the air fuel mix is off you'll still see poor idle characteristic but it'll rev up and drop out *more or less* normally and won't hang high. Unless it's so bad that one or more cylinders are far enough off to the rich or lean that they don't fire properly at all. Compression is king so the first thing we do is put the gauges on, and if it's not perfect--or more significantly if it's low on one cylinder or more--we want to move forward and have a look at the cams and valve clearances. This ensures that we're on the trail of the actual problem instead of maybe chasing ghosts. OSC http://www.oldschoolcarbs.com http://www.youtube.com/watch?v=H0LfUyQzNCI Link to comment Share on other sites More sharing options...
Member Contributer Duc2V4 Posted September 10, 2013 Member Contributer Share Posted September 10, 2013 Im in the middle of syncing my carbs and it still is not running real great. Wondering if the air fuel mixture is off. What is standard on these bikes? Sent from my XT907 using Tapatalk 4 Air fuel mixture and synchronization are entirely different beasts, each with their own set of symptoms that in some ways appear to mimic each other. Synch pertains to the positions of the individual throttle plates relative to each other. If one is a teensy bit more open than its neighbors it'll throw the vacuum off and result in a tug-of-war. You'll see unstable and slow/hesitant return to idle, revs hanging high between gears, and the idle will tend to rise uncontrollably as the bike warms up. If the air fuel mix is off you'll still see poor idle characteristic but it'll rev up and drop out *more or less* normally and won't hang high. Unless it's so bad that one or more cylinders are far enough off to the rich or lean that they don't fire properly at all. Compression is king so the first thing we do is put the gauges on, and if it's not perfect--or more significantly if it's low on one cylinder or more--we want to move forward and have a look at the cams and valve clearances. This ensures that we're on the trail of the actual problem instead of maybe chasing ghosts. OSC http://www.oldschoolcarbs.com http://www.youtube.com/watch?v=H0LfUyQzNCI The bookmarking OSC, thanks! Link to comment Share on other sites More sharing options...
VFRBert Posted September 11, 2013 Share Posted September 11, 2013 Maybe some of the carb insulators are leaking. I had this once with a poor running bike i was servicing. After valve clearance adjustmet (al 16 valve's to tight) synchronisation was not really succesful, after testing i found air leaks. All insulator clamps not tightened. After correcting this and synchronising the carbs, the bike ran so good, that the owner not familiar with a powerfull bike, nearly crashed it with a highsider. Link to comment Share on other sites More sharing options...
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