Question about Yamaha V-Max Motorcycles

2 Answers

I have a 2002 Yamaha Vmax with 7k miles that is in exceptional condition. I purchased it 3 months ago and discovered it had 4 cracked coils. (Replaced with 4 OEM coils and new spark plugs). Meticulously went through the carbs and cleaned and set to factory specs. (All pilot air idle screws were set to 2 and 1/.4 turns) Bike will crank with choke and once warm will idle at 1200 rpm only if throttle stop screw is turned in enough to actuate butterfly valves in each carburetor throat. When the engine is revved, it SLOWLY returns to idle speed. (15 to 20 seconds). I just don't feel like it has the "quick snap" response it should have. What am I missing? Some real expertise would be much appreciated.

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  • water2live4 Sep 07, 2010

    Thanks for the quick reply. I live 20 minutes from the ocean, that's why I set the pilot air screws at 2 and 1/4 turns. The airbox is 100% stock with no cracks or leaks. I visually inspected the airbox boots and intake manifold for cracks or tears or sealing problems. I even sprayed starter fluid around the outside of the intake boots clamps as well as the airbox boots with no change in idle speed. I do not currently have a set of mercury stix to synch the carbs, or vacuum guages. I realize that one or the other will be necessary to make final precise adjustment, but I was careful to "feel" the butterfly movement of each carb, "matching" them two at a time, then "cross matching" between the pairs. I'm thinking as close as they are currently synched, the bike should run better. In your opinion, should I use mercury stix or vacuum guages to synch the carbs and do you know of a site where I might purchase them? Thanks again!!

  • water2live4 Sep 08, 2010

    Thanks for the info! I used a set of mercury stix 20 years ago when I owned a bike shop in S.C. I've been away from it for a while and guessed they may no longer be available because of the toxicity of mercury. While I was waiting to hear back from you, I found a place in the UK that sells Carbtune synchronizers. Got great reviews. I'll order them in the a.m. I was looking for a fresh set of eyes on my problem and you've provided that. Thanks a bunch for your expertise. Mark

    I've included the link, in case you want to check 'em out. Thanks!

    http://carbtune.com/

  • water2live4 Sep 08, 2010

    Heimlich, when I responded to your last submission to me yesterday, I failed to press the "I accept this solution" button, and now it says I did not accept your solution and it has another mechanic offering advice. I am happily satisfied with the information you provided and ordered a carbtune synchronization tool this morning from carbtune.com. Can you tell me how to ACCEPT your solution and close this problem?? Sorry for the inconvenience. Thanks!!

  • water2live4 Sep 08, 2010

    Heimlich was extremely professional and helpful. He has excellent communication skills. His answers were straight forward and simple to understand. He is a true asset to your team. Thanks!

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Air screws can be altered slightly for your elevation. Stock setting is for sea level conditions. Example if all your riding is at 1000 ft elevation maybe your standard setting should be 2 and 1/8th turns. I suggest you try resyncing your carburetors. One or more of your carburetors may be set too high or too low , causing the slow return to idle. As you adjust your carbs remember to keep resetting your idle to the recommended RPM. If you decide to try a different air screw setting be sure to double check all you intake manifolds for cracks or separation from the flange, air leaks will also effect your idle. Altering the air box can effect your carb intake vacuum (vacuum carbs are sensitive to this.).

Posted on Sep 07, 2010

  • David Belcher
    David Belcher Sep 07, 2010

    Unfortunately, I do not think you can purchase mercury carburetor synchronizing tools any more. They are the best option. It is possible a neighbor or local mechanic may have a set. There may be a tool rental place or auto store that has one available. It can take a minimum one half hour of fiddling to get a good carb sync. Eye balling the carburetor butterfly valves just gives you a good starting point.

  • David Belcher
    David Belcher Sep 08, 2010

    Thanks for the information. I mostly do this because I like to help people. But it does not hurt to get a little pocket scratch to. Checked out the website you sent . It is a good looking instrument I hope it gives you many years of good service.
    Thanks again
    Heimlich

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HI! Please check on vacuum hoses. There might be loose, worn or wounded vacuum hoses that needs to be secured. One good reason it take some time for it to drop to normal rpm. HOpe this helps and thank you for using FixYa!

Posted on Sep 08, 2010

  • dj_relly999
    dj_relly999 Sep 09, 2010

    Hi! HOws it going?

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