GSX-R 750 Pictures of how I fixed the oil leak from the alternator on my 1985 1986 1987 Suzuki GSX-R750 motorcycle.

But first, lets pay some bills:

  1. There was an oil leak from the o-ring on the back of the alternator. It was difficult to find where the oil was leaking from. It was oily on the top of the transmission area, under the starter and alternator. I thought maybe the valve cover or the oil lines, but they were clean. I cleaned it all up and rode it around and found the leak.
    I thought this bike had a generator, but I was wrong. It is an alternator. Alternators have rectifiers to change the alternatirng current into DC. This has a rectifier. Ergo, Alternator it is. Plus generators are more long and skinny.

  2. Pulling the alternator was a snap. These three bolts.
    Alternator Bolts

  3. And this wire connection.
    Alternator wires

  4. There is the o-ring on the back of the alternator.
    Alternator O-Ring

  5. A bit of it is cut out. When it was installed, the person forced it in. The o-ring got caught on the sharp edge of the engine case, and a sliver got cut out of the o-ring, and it leaked.
    Drip Clean

  6. This o-ring is pretty expensive. Something like $40 from the dealer or online. So I took the old o-ring down to Grainger, and they matched it up. The next day I picked up this package. Would you say that I have a plethora of o-rings? Oh, si, El Guapo, you have a plethora.

    Want one? Ask for one in the comments page and enter your email (your email will not be displayed or shared). I'll send you 2 for $5. The extra one in case you slice it. And don't just write, "I want one!" Write something descriptive like, "I would like to purchase an alternator o-ring." Because that comments page is for 100 different pages on BeerGarage, and I won't know what you are talking about. I probably won't even remember that I wrote this page in the first place. What? Where am I? Where the hell's the records room?
    Plethora of o-rings

  7. Here is a new o- ring installed on the back of the alternator, and the old o-ring next to a new o-ring. You can see the slice out of the old o-ring. O-ring, o-ring, o-ring, o-ring, o-ring. The word has lost all meaning.

  8. I put some oil on the new o-ring.

  9. I put some oil on the engine case where the alternator goes.
    more oil

  10. Installed the alternator CAREFULLY, GENTLY, and HORIZONTALLY. And hey presto! No more leaks.
    Hey Presto!

  11. Next I sold out to make 02ยข so I can fulfill my lifelong dream of owning a 1986 944 with blown head gaskets.

    But no minivans!

  12. Then I finished my beer.

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Think: Cars are expensive, powerful, and heavy.   Before I start work, I face the possibility that I will destroy my vehicle, my own life, and innocent pedestrians' lives.   If anyone messes with a 4000 lb machine capable of 100 mph, these are real possibilities.   If I get in over my head, I call a professional mechanic.   The information on this website is provided only for entertainment purposes, and it is not intended as advice on how to service a vehicle.   For all you know I made this up.   Don`t believe everything you read on the internet.

Disclaimer: The technical information in these documents is provided without any warranty whatsoever and at no cost.   All information is in general terms and is not meant to apply to your particular situation, be current at the time you read it, or even be correct in the first place.   Improperly maintained vehicles can lead to serious injury, death, or unavoidable accidents. The author is not responsible for any errors on this site, and does not make any claim at all about the validity, safety, or veracity of the information contained on this website. Any work you choose to do or not to do on your vehicle is done at your own risk. The information on this site is not intended to serve as a replacement for professional advice, professional workmanship, dealer service, union labor, or psychological counseling.   The author disclaims any and all liability directly or indirectly arising from the application or use of any information or idea contained on this or any other web site.   By opening this page, you agree to never sue anyone ever or allow anyone to be sued on your behalf.   The appropriate professional should be consulted regarding your specific condition. does not take responsibility for the information posted on other sites to which it links.

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