Topic: Chain Thrown??? Not sure...

[odin836]

Engine has been pulled from the frame and mounted on the engine stand.
(Thanks to whomever originally welded steel tabs to bolt heads, makes mounting easier)

There seems to be some sort of gunk stuck to the block, where a chain possibly could have been thrown and repaired using some of that cold solder stuff...

What is the "BEST" solution to repair such damage???

[mystic_1]

Well, you're in for a full tear-down if you want to really fix that.  You'll have to have the case TIG welded.  You may need to use a chisel to remove that stuff, depending on how well it's adhered.

Or you could leave it and cross your fingers.  Is it leaking?

mystic_1

[odin836]

Yes, it had quite a build-up of oil, although it was hard to tell if this was 'leaked' from the engine or thrown from the chain.

I'd like to do a propper repair, as I'm planning on increasing engine capacity (836) and dont really want an issue further down the line.

Who typically repairs this type of thing?  Not your average mechanic I'll bet.

Cheers!

[mystic_1]

You'd want someone whose done this sort of work before.

Might be cheaper/easier to find a set of replacement cases.

mystic_1

[bryanj]

BEST repair---New Cases

[Soos]

I agree.

Another motor is the best fix IMO.(cheaper and less time intensive as well)
It will cost you a trip to a bike boneyard or three, but you will be able to ride your stock damaged case motor while putting the 836 kit in the other motor.

Just check the new motor over well, make sure it's a good candidate.




l8r

[vtwinjunkie]

If your going to get into another motor to bore ect. you might as well just get another motor and replace all seals and bearings while you have it torn apart

[754]

As far as case damage goes, that is fairly minor.
Dont get too worried yet. Strip ogffwhat is on it, and see if there is an actual hole or chunk missing.

When that is the case, often globs of repair material get pushed inside.

 It appears the bottom case is OK, unless there is a small crack.

 I know of a member on here that I gave advice to that split the cases, leaving the topend on. Then removed some trans parts, got upper case welded, resurfaced it himself (after a pep talk),and has A LEAK-FREE HAPPY MOTOR....  for less than the price of main bearings and gaskets.

 Yours looks good, they often have chunks broken out on both cases..

[mystic_1]

I agree with 754, that damage is minor compared to some things I've seen, first hand even.

I'm seeing two layers of stuff in the pic, looks like someone fixed a small hole, then it leaked, and either the same someone or someone else applied more goo trying to seal it up.  If it's already leaking, start digging and see what you find.  At worst you can apply some new goo yourself to keep it sorta sealed until you work up a replacement.

I've seen motors run with far larger repairs in that area, and hold together fine.  So long as you're not finding crap in the oil you're probably ok for a while.

mystic_1

[TwoTired]

About the oil you found...
You sure it's not from the chain oiler?
Some 750s have this device, does yours? 

Cheers,

[mystic_1]

Yes it does.  You can see it at the center of the sprocket, the large hex nut with the screw in the center is the oil mech adjuster.  Turn the screw inwards to reduce or stop oil flow.  His looks to be most of the way closed if not completely closed.

mystic_1

[754]

2 things with the patch.. It must be clean , if not it could still leak

 And you may want to add anchors.. easy to do..

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Mystic, I wood rather use the chickens altho a logistical harness nightmare,
cuz they would fertilize the soil for you, and eliminate a few bugs.. and chicken drumstix are tastier than oxen..

[odin836]

Thanks for the responses.

On further inspection, I agree with mystic_1, there looks to be two repairs done.

Seems both replacement and repair will work, based on your comments.

I'm a bit of a perfectionist, and never happy unless all is as it should.
That said I'll see what I can source locally from the graveyard.  It will be interesting to see what prices a complete motor will go for given all the interest in the 750s, the cost might decide the future of my current case... Graveyard or repair!

I'll keep you updated on how I go.

Cheers!

[odin836]

Well its been a few months between drinks....

The case is apart and it looks like there are a few more "imperfections" with the engine case.
Whats the general opinion here, ignore, weld or seek a complete case replacement?


Engine Mount



Next to primary chain roller



External???

[bucky katt]

new cases are what i would do, well new to you. i'm cheap as hell with some stuff but theres too much damage on those cases.

[odin836]

The hard part will be trying to find a set of cases here in Australia.
I notice there are currently 3 available on ebay in the US for a reasonable price.

Dont like my chances...