Question about 1999 Yamaha Royal Star XVZ 1300 A

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Additive to seal air/oil shocks

Is there a oil additive that can be added to the rear shock to stop leaks??

Posted by Anonymous on


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  • Yamaha Master
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Hi, Anonymous its all snake oil for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
OEM parts for Yamaha
YAMAHA XVZ1300A Owner Manual
Yamaha XVZ1300A Royal Star Venture
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Posted on Apr 19, 2016


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Posted on Jan 02, 2017

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SOURCE: why do you use nitrogen in the rear shock?

Nitrogen is used for it's high pressure and lack of moisture,Air will work,but you can only get about 125psi and alot of moisture and 125psi will not be enough pressure.

Posted on Mar 17, 2009

SOURCE: My YZ 250 F rear shock absorber fluid and nitro amount

there is no quantity that i can give have to fill that thing completely and make sure you have no air at all in it...maybe you can see this important step on you tube....otherwise the pressure of nitrogen is between 150-175 lbs depending on the way you like you're bike to absorb..make sur you place you're valving shim in right place if you change you seal....

Posted on Sep 16, 2009

  • 67 Answers

SOURCE: rear shock sealhead Kyoba on Y Z 426 F

I assume you have disassembled the shock, ground off the peened end of the shock shaft, removed the shaft nut, and have the seal head off already? If so I recommend not to disassemble the seal head itself. The fragile little bushings and seals in the inner diameter of the seal head are extremely difficult to R&R without scarring the seal head or the replacement parts. Your local dealer can order a complete seal head from KYB Direct or Moose at a reasonable price. This is a much easier and more reliable fix.

Posted on Feb 17, 2010

  • 194 Answers

SOURCE: yz125 rear shock amount of oil on

The volume is less than about 1/2 quart - it's usually not measured going in since you fill the shock completely - there's no need to measure. Some guys assemble the entire shock, then fill with oil and cycle the shaft, then install the bladder cap last. My method is to install the shaft and seal head and the bladder, then put about 2 PSI in the bladder, then bleed through the compression cap. My method is a bit more complicated to explain, but it's effective at eliminating ALL the air from the oil and it keeps the bladder from being installed in a collapsed state.

As far as the nitrogen charge - 145PSI is stock. 130-160PSI is typical.

Posted on May 04, 2010

  • 73 Answers

SOURCE: rear air shock leaks

The shock absorber assembly is a unit with no serviceable parts - you can try tightening the valve in the valve stem, but your only further option is to replace the entire assembly.

Posted on Jul 25, 2010

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