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Richadams · Posted: Mon Oct 26, 2009 1:34 pm Post subject: CAM CHAIN TUNNEL OIL LEAK

HI folks

Iv just got back into bikes and bought a '79 xs750. Discovered its got a nasty oil leak from the cam chain tunnel between head and the bores. I see a couple of fellas have discused this but i was wondering how you got on sorting it? Its coming off the road for winter so im going to remove head and bores. Genuine gaskets are very expensive so was going to use pattern parts. What are your views on this? Is there any pit falls i should consider before attacking the job?

Thanks Rich

750e Bucket · Posted: Tue Oct 27, 2009 8:43 am Post subject:

Not really pit falls as such. The main problem can be geting the barrels off the studs. A lot of corrosion builds up on them and when you try to separate them, it can be touch. Clean as muchof the crud off them prior to trying to spit, and be careful not to shear any head studs off. Soak the nut for 24hrs in release oil/WD40 before hand.

There is a tip on my site at http://www.xs750e.com Hint-tips page I think.

The after market seals are OK as far as I can tell. I bought the Athena set which I'm still working on.

While you're in there I recommend that you replace the cam chain, and lap and grind all the valves. Might as well, as the chain is only about £30 to change and they can be quite noisy.

Keep us posted with photos if you can, other people would really benefit from your experience.

I'll try to post some of mine too.

:)
_________________
Warren

---XS750e 1978
(Nickname 750e Bucket)

---FJ1200 1990 for winter riding and fun!!!!! Ahhhhhhhhhhhhhh it's fast.

PHOTO ALBUM
http://picasaweb.google.com/XS750e

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Richadams · Posted: Tue Oct 27, 2009 10:19 am Post subject:

thanks for that. I will let you know how i get on. may take a while. i have to convince the other half that we need to share the kitchen.

cheers
rich

750e Bucket · Posted: Tue Oct 27, 2009 3:46 pm Post subject:

LOL

I know that feeling of dread........

_________________
Warren

---XS750e 1978
(Nickname 750e Bucket)

---FJ1200 1990 for winter riding and fun!!!!! Ahhhhhhhhhhhhhh it's fast.

PHOTO ALBUM
http://picasaweb.google.com/XS750e

----------------------------------------------

Richadams · Posted: Fri Oct 30, 2009 6:29 pm Post subject: The Job is Getting Bigger!

Stripped the head off and found the problem. Some cheeky monkey has lifted it before, seen it needs a major de-coke and put it back on without doing the work. Hence the old gasket leaked. At least I've found it.

As i used to be a car mechanic shouldn't be too much of a problem. Already decoked head and valves and should have them lapped in nicely and repainted by monday.

I was amazed it was running as well as it did. What a stolwart!

Havent worked out how to post pics yet.

750e Bucket · Posted: Mon Nov 02, 2009 7:44 am Post subject:

If you look at the bottom of your reply post, you'll see a tiny little text below the main window, to the bottom left.

:)

_________________
Warren

---XS750e 1978
(Nickname 750e Bucket)

---FJ1200 1990 for winter riding and fun!!!!! Ahhhhhhhhhhhhhh it's fast.

PHOTO ALBUM
http://picasaweb.google.com/XS750e

----------------------------------------------

Richadams · Posted: Wed Nov 04, 2009 9:15 pm Post subject: Coke head

Now that i know how to post photos take a look at my poor head and valves

Three stages of cleaning

No3 untouched No2 wire bushed No1 polished

And the valves...

She should have been missing, pinking and backfiring but the old girl was doing well.

They are now lapped in and im setting the valve clearences. Once the Head is rebuilt and painted it will be the cylinder bores next. Its my first time working on a bike engine (used to cars) but a quick eyeball showed no score marks and it wasnt burning oil when running. So fingers crossed.

I will keep you up dated on my progress.

PS wish i had took photos of bike before I took if off the road for a comparison.

If anyone wants me to do a more blow by blow posting let me know.

Rich

shadowman · Posted: Thu Nov 05, 2009 8:39 pm Post subject:

did you remove the head with the engine in the frame ?

i'm rebuilding my bike and it will make it a hell of a lot easyer
to replace the engine whitout the cilinder head on
less chance to ruin the new paint job

grtx han
_________________
GRTX HAN

_______________________
Keep the downtubes upright

Richadams · Posted: Sat Nov 07, 2009 12:09 pm Post subject:

Hi Shadowman

Yes the engine is still in the frame. I have the 750 and the horn made it tight. I removed cams with a spanner and dont think i will get a torque wrench on the cam cap nuts when i rebuild. I plan to remove horn and fit cylinder head complete with cams when i rebuild.

Good Luck with it. Keep in touch.

Rich

shadowman · Posted: Sat Nov 07, 2009 9:49 pm Post subject:

thank for the answer

I have already build up the cilinderhead

so I only need to tork up the nuts from the cilinder

_________________
GRTX HAN

_______________________
Keep the downtubes upright