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vibration
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  1. Jet Boats
    I have vibration that chimes in just over idle. The vibration is only present when the steering nozzle is straight. If I turn the steering wheel a few degrees in either ditection, the vibrstion goes away. Switching from forward to reverse also seems to change is presence. This is a new motor...
  2. V-Drives
    I am running a Turbo 400 in a Schiada 21 RC. The v-drive has 45% over gearing. When I take off in 2nd, just as the boat comes onto plane it vibrates a lot. The vibration instantly goes away as I shift to third. No further vibration from then on. Is this normal? (prop cavitation maybe) Your...
  3. Jet Boats
    Hi guys boat had been running great for 10days no issues took it out yesterday had bad vibrations found a rock stuck in output vane of bowl, removed tried again today same issue. Nothing stuck in the grate, or impellar that I can see, wondering if a ujoint popped or something. watching the...
  4. Tow Vehicles
    pulling my jet boat, 19ft tunnel, with the bed loaded, I have a bad vibration at highway speeds, 65ish, i can drive out of it, whole truck shakes, you can see the dash vibrate, feel it in the seats, i just put in new u joints, trailer is new, maybe 500 loaded miles on it, truck is a 98 Z71, i am...
  5. GN7 On the Dyno
    so i finally finished my motor and got it running, boat runs great minus one issue. It has a weird vibration and im not sure if its just due to that big mountain motor in such a light layed up boat or if i have a motor that wasnt balanced properly??? its smooth as silk at idle, but in neutral...
  6. GN7 On the Dyno
    ok i have a 502 magnum MPI with a bravo 1 drive.i have only owned the boat 1 year now.i have always elt a small vibration in running gear.So i automatically thought drive, i pulled the drive tonight checked gimbal bearing it turns perfect and smooth (plenty of grease) the u-joints also semm just...
  7. Jet Boats
    i need some advice or a link to the answer please I sucked some rocks up today so putz back to the dock loaded it on the trailer then removed the rocks from the hand hole cover and put it back in the water. it moves ok at low rpms but higher rps it dont get to plane fast and has a wicked...
  8. Jet Boats
    I have a Advantage 20.5 classic with a 468 bbc fresh motor and a rebuilt berkley i seem to get a vibration starting bout 4000 rpm. Any ideas? My buddie checked it, he said it feels like the pump. I believe it could be transferring from the motor, but really have no idea how to check. It feels...
  9. Jet Boats
    Was about 8 miles up river from Fishers Landing last friday everything running great and all the sudden I could feel a vibration/cavitation feeling...reminded me of what it feels liek when you suck up weeds in the pump. Boat felt like it lost about 20% power also. So we beach it on a sandbar and...
  10. Jet Boats
    I replaced my rear pump mount to a full 4 point mount. After doing this took out to Elsinore and now have vibration at 3000 rpms and gets worse the more rmp. I have pulled bowl, flexplate, shaft and looked over all parts. Nothing in impeller but did notice new bell housing is touching the top of...
  11. PB Open Water
    I was out at Havasu this weekend and developed a hard vibration. This vibration would come and go. I stopped and raised the drive to check and see if anything was caught on the prop and there was nothing. I then eased into the throttle and it was still there now followed by a wine. I decided I...
  12. Parts for Sale
    like new $35 plus ride has chrome bracket that bolts to flat surface
  13. Jet Boats
    My boat has a vibration which makes the hull sing like a tuning fork. It does it at idle all the way to top speed. You can hear it from the beach over the motor noise. It does not make the noise on the tailer. This is a new engine and newly rebuilt pump. We disconnected the driveline and put...
  14. Outdrives
    Ok a little history on my boat... It is a 1980 spectra daycruiser with mercruiser 260 outdrive and 350 chevy. Recently done a carb rebuild and complete tune up... After all of the carb and tune up work we went to the lake and everything was fine, no vibrations or running issues of any kind...
  15. Jet Boats
    I have A 1974 cheetah mini daycrusier with 455 olds. Aluminum heads. 850 cfm carb and log style through transom exhaust. I have just rebuilt the engine which should be in the 450 to 475 hp range. Since rebuild I get a strong vibration at 63 mph on the gps @ 4900 rpms. 12 jc pump w/ A impeller...
  16. Jet Boats
    Hey, just restored a 79 Tahiti jet boat, its got a berkely drive and 454 chevy engine, im a Ford Senior Master Certified tech at a dealership and rebuilt the whole driveline myself, the motor runs awesome out of water and can turn to rev limiter no problem, when im in the water ill mat it and...
  17. Jet Boats
    Hey Everyone, I just bought a 77 Southwind with a 460 and berkley jet. The previous owner told me about a vibration that the boat has when its on the trailer. He said he tried to shim the "jet" and the vibration got better. I dont know too much about jet boats and was wondering if someone can...
  18. GN7 On the Dyno
    Hey guys, the fun continues......I had my BBC 454 crank balanced along w/ the rods & pistons. I added a internal balance damper/ flywheel combo & the thing vibrates like hell?? At idle it's not noticeable, but at the rpm's go up it's felt throughout the boat, thru the steering wheel and the...
  19. Jet Boats
    I decided to put a 4deg wedge in for a little more roost. And at 3500-4000 rpms only it vibrates pretty good, after 4000rpms it goes away, you can feel it in the floor. Any ideas???
  20. GN7 On the Dyno
    This is as simple an explination as it gets. Copy and pasted from TCI's site 'cause I just don't feel like typing it out tonight. Hope this helps in some understanding. Why do you need a vibration dampener or "harmonic balancer"? Engine speed slightly increases during power strokes and...
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