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Thread: 1998 Yamaha venture 700 triple bogging & misfire issue

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    Default 1998 Yamaha venture 700 triple bogging & misfire issue

    I have a 1998 Yamaha venture 700 triple deluxe. It ran perfectly fine, always serviced at the dealer every fall. It was parked for a year then then all hell broke loose. It would idle, but as soon as I would give it throttle it would bog down. I couldn't figure it out. So I brought it to the dealer, they checked and cleaned the carbs, apperently there was a stick needle. They checked phasing, changed the plugs, adjusted the clutch, still a bogg and missfire. They said it might be a CDI box ... So I changed the cdu box. Exact same. I changed the stator and cleaned the fly wheel, same thing.

    So we know the carbs are good, clutching is good, plugs are good, 125 psi in all 3 cylinders good resistance in the coils, stator and flywheel are good... I've spent $1000 on this old sled trying to figure out the issue and still can't find it! Ive checked all visible wiring and bypassed the throttle switch. Any ideas where I should start looking next?

  2. #2


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    One of those things can’t be right.
    -------------------------
    1997 Yamaha XTC
    700 Redhead, Mr. Viper ported, CPR pipes, 20CC Domes, boost bottle, SRX reeds, Heelclickers, Dual bulb, LT Ohlins

    1997 700 SX
    Thinned head gasket, Gutted Airbox, Reed Spacers, Bender Pipes, Viper Shocks, 51/43 helix 89L weights

    2004 Viper S
    SLP pipes, peak performance head,

    2001 SRX 700
    Power Inc. Pipes

    1997 Mountain Max 700
    Black XTC Hood, Thinned Head Gasket, Gutted Air Box, Reed Stopper Notch, SLP Pipes

  3. #3


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    Quote Originally Posted by Justinmckenzie View Post
    I have a 1998 Yamaha venture 700 triple deluxe. It ran perfectly fine, always serviced at the dealer every fall. It was parked for a year then then all hell broke loose. It would idle, but as soon as I would give it throttle it would bog down. I couldn't figure it out. So I brought it to the dealer, they checked and cleaned the carbs, apperently there was a stick needle. They checked phasing, changed the plugs, adjusted the clutch, still a bogg and missfire. They said it might be a CDI box ... So I changed the cdu box. Exact same. I changed the stator and cleaned the fly wheel, same thing.

    So we know the carbs are good, clutching is good, plugs are good, 125 psi in all 3 cylinders good resistance in the coils, stator and flywheel are good... I've spent $1000 on this old sled trying to figure out the issue and still can't find it! Ive checked all visible wiring and bypassed the throttle switch. Any ideas where I should start looking next?
    I was chasing a similar issue on a Polaris last season. After changing most parts you mentioned I checked the fuel pump that had some bad membranes. Also try bypassing any fuel filter from tank to fuel pump and also check in-tank fuel hose. Could check crankcase vacuum pulse line also.

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    1. Take some used plugs and clean them up w/ a bench wire wheel.
    2. Install.
    3. After sled is good and warm, remove them.
    4. The plug that is the cleanest needs to have its pilots scrutinized. Or just changed for piece of mind.
    Dannyboy

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    See if it revs w/ the addition of fuel and throttle.
    Dannyboy

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    It bet a dime to a dollar that while you have the throttle cracked and it's bogging, if you give it a shot of fuel it'll pick right up.
    Dannyboy

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    odds are fuel filter in the tank is bad.
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    Quote Originally Posted by Maim View Post
    odds are fuel filter in the tank is bad.
    Ahhhh ... good call. Ethanol snot.
    Dannyboy

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    Will go after the fuel system this week!

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