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05 750 issue after riding about 20 minutes

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  • 05 750 issue after riding about 20 minutes

    Ok so I have a 2005 750 with around 33k miles. Iíve developed an issue that I canít quite figure out. The bike runs normally for about 20-30 minutes and it donít matter if Iím putting around or if Iím ringing it for all itís worth. After about 20 minutes I develop a rough idle, hesitation at low RPM and part throttle (feels like a misfire) but if I go WOT it will run out to redline almost normally with almost normal power. At idle the rpmís drop and it will stall. Choking donít help, changing from run to prime on the petcock donít help. Itís almost like this is happening only when itís warmed upÖ what am I missing????

    all that and Iíll explain what Iíve done so far. Cleaned and rebuilt my carbs (with a carb kit), all new jets, synced them with a vac gauge, re set float height because it almost feels like itís fuel starving, new petcock from Suzuki, new fuel line, and filter, new CDI box, new coils and wires, Iíve had the carbs off and apart no less than 20 times in the last couple monthsÖ what am I missing? I rode 5 miles to work tonight and you canít tell anything is wrong and Iím sure it will be the same way whe I leave in the morningÖ

  • #2
    This may or may not have anything what so ever to do with the problem. But I have heard of something like this before, the issue was caused by a clogged gas cap or gas tank vent. One way to check it, is when this happens, is to open the fuel tank so it can vent. Kinda hard to do while you're riding the bike understandably. Maybe test this theory by leaving it open while carefully riding it?
    1997 Yamaha Seca II - mostly stock, Racetech upgraded forks, FZ6R rear shock, Oxford Sports Style Heated Grips, Barkbusters Blizzard Cold Weather Handguards, a Scottoiler vSystem chain oiler. My Mileage Tracker Page