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Cam journals

  • Thread starter Thread starter MLSR Pilot
  • Start date Start date
M

MLSR Pilot

Guest
Hello everyone, and happy New Year! Glad there are such forums like this one, thank you. I was referred by a fellow GS enthusiast to ask this community a question in regards to what I found when I was having my motor parts inspected and checked for proper rebuild. I found my cam journal cap for the intake on number 3 cylinder to have a bit of irregularity during inspection. There was no damage to the cam, the bike was running when I did the break down. The discussion was that this journal may have a lower oil pressure threshold than the other journals due to this irregularity. I am restoring this bike for sentimental value, and it is not going to be raced, nor is it my primary steed. Thank you in advance for your input on this.
 

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I would simply chamfer that little bit of metallurgical irregularity to keep it from spreading with a die grinder and call it good myself.
Other members will offer their advice too.
 
Welcome to GSR. Please list your bike in your signature so other members won't need to ask what bike you're working on whenever you post a question. Also a good idea to list your location in your profile. There might be a generous guru nearby willing to lend a hand.
 
jsandidge said:
Welcome to GSR. Please list your bike in your signature so other members won't need to ask what bike you're working on whenever you post a question. Also a good idea to list your location in your profile. There might be a generous guru nearby willing to lend a hand.
Click to expand...

The location is already there, but we DO need a clue as to what bike it is. :-k

.
 
(Whoops) What does the model have to do with the repair/question? There are a few GSR members near Modesto. Perhaps some of you can get together for a ride sometime. :)
 
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Sorry about that, the specific bike I am talking about is a 1986 GSXR 750. I used to own one about 28 yrs ago. I found one on Craigslist that was the same color, and still had the stock red color scheme like I had those years ago. Still working on navigating this forum. Bear with me.
 
I did not look close enough to notice that it was an end cap with one oil groove. :o
For those interested, I just took a pic of some common GS parts. The left cam cap is typical for a 2-valve engine. The black one is for holding down the
handlebar and the two on the right are typical 4-valve cam caps...





MLSR Pilot: You have a bear with you??? Do you take him/her with you everywhere that you go? Need a special permit to own one?
 
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This is what bad cam caps look like:

P1110395.jpg


I would say as others have done; grind off the edge and put it back in.

As a precaution, I would drop the sump and check the sump filter (if the 750s have this like the 1150s do) and see if there is any metal stuff kicking about. That would give you a good idea of the condition of everything else.

From what I can see, I might suggest that this is not the oil starvation problem I had on my one but more like a part failure (metal fatigue?) or incorrect assembly procedures.

I am no expert but I share my own experience.

Greetings
 
Ha ha! Hey thanks for the replies. I did some work on the cap posting a pic of where I'm at. Yep, I have a particular buddy who visits this page. This GSX used to be an old favorite of mine. The motor looks clean as if it were rebuilt, then simply parked. Motorcycles have been my long time passion, dabbled in racing motocross for years, trials riding, supermoto, enduro. I hope this bike feels as good in the twistiest like I remembered. I did take some other picks of the pistons and such to show the condition to wilmrx.
 

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Good job on the cam cap. Be careful not to over tighten the valve cover bolts when you reinstall or you will be learning the fun of 7mm x1.0 Helicoils too! ;)
Ray.
 
Thanks Ray. GSX, yep bear is in the back yard building a fire it's cold lol! Yes, that pick of the pistons is what I found when I slid the jugs off showing the liberal application of oil on the pistons. The main reason for the disassembly was due to a pretty bad oil seepage coming from where the cases split directly behind the exhaust header. At that point, disassembly was the only option to solve the leak. Going to hone the cylinder walls before re-assembly, and possibly rings if needed. photo(99).jpgThis is a pick of the bike right after I purchased it.
 
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Looks like a worthwhile project to me. :cool: Plans to hop it up a bit while it is apart?
 
I want to keep it stock. I picked up a complete NOS gasket kit for the bike about a year ago, then the stock exhaust, airbox, carbs, removed the rust from the tank, new petcock, It also came with a rear Fox shock which I also have a seal kit for that too. I have seen quite a few GSXR's, but always look beat, or weird color schemes. I found this one in Santa Cruz, at a guys motorcycle shop. He took the bike as payment for some work he did on an R-1. He basically had about seven bikes for sale, I was there for the GSX. My original bike in 1986 was stolen in broad daylight from my girlfriends apartment complex. We had gone to the lake for the day. I found my security chain cut, broken steering lock pieces, and a front tire mark where they had to drag the bike out to load it into a truck or something. So finding this bike, in the condition it was in, was like serendipity. My friends aren't too keen to the idea, as it is a dated bike I understand, but still something I want to do. Even with the bike torn down, I still find myself staring and marveling as I did when I had it before. This bike was like a big milestone for Suzuki at the time. Aluminum frame, air oil cooling, dual headlights, lightweight. Can't wait to get it running again in its stock form like the day when I walked up to it idling at the dealership. I never forgot that day.
 
I found a couple more issues with the bike. There is about 3/4in. of aluminum missing where the shift drum is located not good..... I can see that a shift fork was replaced, and found the most probable cause for the leak at case halves behind the exhaust. The ol classic hammer and screw driver gashing and shredding of both case halves, the bottom taking the worst of it. I am DIY person, I work on all of my own vehicles, finding this on any of my vehicles or projects makes me seethe with contempt and I have to walk away for a while. This may be speed bump. I will post some pics. Not sure how to post more than one per post?photo 1(3).jpg
 
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photo 4.jpgNot sure how to post more than one pic at a time, but this should give an idea of the condition of the case. Any chance there is a way I can repair this to ensure a good seal? Possibly some JB weld type material that can fill the gouges, then file it down?
 
hammer/screw driver with a couple hidden bolts still attached...i bet the one(s) back around the alt. area.
that is a real bummer.
i wouldn't try JB weld...not sure really.
i have had small areas scarred and i always filed the surface and used yamabond on street engines..yes suzuki engines..lol
i know yamabond works well so i stayed with it for all brands when splitting the cases.
 
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