Question about kawasaki VN 1500 Vulcan Classic Motorcycles

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Transmission shifts hard in first gear

Only happens under full throttle. When accelerating under full throttle in first gear about a 1/3 into the power band there is a momentary hiccup and then about 2/3 it will do it again. After shifting into the other gears there is no problem.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: 98 honda shadow vt600 weird shifting under heavy acceleration?

Hi appleg5guy

Have you tried to adjust the clutch?



Knight.(Yamaha Seca XJ750A 1981)

Posted on Feb 12, 2009

  • 30 Answers

SOURCE: automatic transmission bangs into gear.

sounds like a bad u-joint. when it wears out it will allow play in the drive shaft, causing it to make a bump while shiftinf

Posted on Mar 13, 2009

csmock132
  • 4669 Answers

SOURCE: 1997 Suburban 4x4 5.7L Transmission whines until it shifts

You rear planetary set is worn from a restricted cooler.

Posted on May 06, 2009

netrakid250
  • 52 Answers

SOURCE: my 2003 yamaha banshee will shift threw all gears

Check the gears mabey they are skipping when the bike goes to fast. like at 3/4 throttle theres to much torque an it just wont catch.

Posted on Jun 06, 2009

pippall
  • 1486 Answers

SOURCE: does not shift in 3rd gear when hard on the throttle

sticking clutch seems to be the problem.remove and check the plate.

Posted on Jul 17, 2009

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Dont throw it off a cliff just yet :-) Just check the vacuum line from the inlet manifold back to the transmission, ensure that fittings are air tight and that there are no holes in the line.
Explanation for possible fix:- When the car is at idle the inlet manifold plenum has a reasonably high vacuum generated within it. The vacuum line to the transmission conveys this drop in pressure to the shift solenoid. When you accelerate slowly you hardly open the throttle and the vacuum remains high in the system. The solenoid allows early shifts through to the higher gears. If you accelerat hard the throttle is open wide and hardly any vacuum is maintained. The shift solenoid, in the absence of vacuum in the line, now holds each gear for much longer allowing the engine to use its full power band.
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The pops and the disconnected vac(uum) line and the smell of fuel may al be related. The vacuum line to the auto transmission is there to tell that gear shift about the level of load that the engine is under. When you first start the car and accelerate really slowly notice how quickly the gear box shifts up through the gears. However if you accelerate hard the transmission holds each gear for a long time to take advantage of the high power delivered by the high engine speed. The vacuum line conveys to the transmission the level of vacuum in the inlet plenum manifold. When you accelerate slowly the throttle plates only opens a small amount and maintains a strong vacuum level. This vacuum permits the transmission to shift up through the gears quickly. If hard acceleration is demanded the throttle plate is fully open and there is almost no vacuum. The lack of vacuum on the transmission restricts gear shifts. The vacuum lie usually makes connection with the transmission on the left (facing towards the front of the car) near the selector switch. The other end of this line must make connection with a port on the inlet manifold plenum or runner (on my car the port connection is actually very close to the injector on the inlet runner towards the back of the engine). The open connection port is causing the other problems. With un-metered air entering the plenum (not passing through the throttle) the engine computer is struggling to keep the injection times long enough to keep the fuel to air mix balanced. This gives rise to very uneven running and perhaps the 'pops' and smell of fuel that you are experiencing. Locate the connection and stick the vacuum line from the transmission on it. Make sure that there no further leaks compromising the inlet vacuum. Make sure the interior of your 'new' throttle is very clean. All of these things help and add up to a better running engine.

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98 honda shadow vt600 weird shifting under heavy acceleration?


Hi appleg5guy

Have you tried to adjust the clutch?



Knight.(Yamaha Seca XJ750A 1981)

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