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1999 yamaha 9.9 will only run at half speed when in gear but revs fully in neutral.can you tell me what is happening.

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  • 49 Answers

Possibly restricted exhaust or valve worn or piston rings worn take out spark plug hold gently but firmly against the plug hole turn over engine Holding the plug obviously not with spark plug cover on !! It should at least push the spark plug away from the hole with a pop pop pop sound if so hopefully that rules out valves if it's not burning oil then it probably not rings could be timing off or valve seals most engine with leak will run full revs under no load ps also check plug gap :-)

Posted on May 27, 2019


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Posted on Jan 02, 2017


Greg Margossian

  • 1959 Answers

SOURCE: 2001 Mitsubishi Galant Transmission problem?

Could be a few things:

  1. Low on auto transmission fluid; this would cause you to lose a few of the forward gears (reverse is used less often so its the last gear to go Start the car and add fluid to the specified markings on the Auto Transmission dipstick
  2. Bad auto transmission fluid; Check the fluid, if its brown and gives off a burning smell, it needs changing along with the filter
  3. Bad transmisssion; if neither of the above are true, then it sounds like the clutches have burned out on the transmission or the transmission itself is bad; if 1 or 2 hasn't solved your issue the car needs to be diagnosed at a reputable transmission shop; Make sure they lay out all of your options and if you decide to have a major transmission repair done, the Kelly Blue Book value on a similar car similarlly equipted in exellent condition is about $6,800 retail
I hope this leads you in the right direction. Don't be afraid to post back with any questions. Best of luck.

Posted on May 23, 2009

Z Laws

  • 375 Answers

SOURCE: My 9 month old Yamaha YZF-R125 has been cutting

Sounds like you have either got water in the system or poor connections.
You can use something like dielectric grease on each connector. It is a bit of a pain having to open and close each connector on your bike, but once you've done it, you shouldn't need to do it again for a long, long time.

Posted on Jun 29, 2009

SOURCE: Aprilia RS 125 Power Loss

I guess youwillhaveto adjust the clutch cable so as to open the plates more at the pressure plates to let the clutch plate rotate freely instead of binding thus the low rpm.
Hope this helps!

Posted on Oct 30, 2009

andrew richards

  • 87 Answers

SOURCE: yamaha xt 600e 1995. won't rev above 4000 under

sounds like it may be running out of gas under aload it might be carb trouble

Posted on Jul 29, 2010


  • 1 Answer

SOURCE: Yamaha 2001 ttr 250. Bogs above half speed, under load

I have the same problems with my 1999 TTR 250, were you able to find out anything?


Posted on Aug 07, 2010

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1 Answer

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Hi, Christopher and the usual suspects are:
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I have the same problems with my 1999 TTR 250, were you able to find out anything?


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