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Offline l3oK

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Engine rebuild
« on: June 26, 2014, 02:30:43 pm »
So,, my 2006 GSA dropped a valve...

Quote from BMW is 39k which on a 70k bike does not seem worth it. but selling it for parts is also not an option for me.
At first I thought that I'll rebuild it myself but after I read pleco's whole tread it seems like finding an engineering shop or reputable indy might be the better option.

So my question is what do all the experts recommend? And any references you might have will be most welcome.
 

Offline Welsh

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Re: Engine rebuild
« Reply #1 on: June 26, 2014, 02:53:22 pm »
Find a short motor and trasplant 8)
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Re: Engine rebuild
« Reply #2 on: June 26, 2014, 03:26:48 pm »
Mileage when it happened?
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Offline l3oK

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Re: Engine rebuild
« Reply #3 on: June 26, 2014, 03:53:23 pm »
 

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Re: Engine rebuild
« Reply #4 on: June 26, 2014, 04:03:27 pm »
Mileage when it happened?

About 87 000
Wonder why at such low mileage?
Leo's one did it too but at 160 or 170 000.
I would source secondhand parts and fix it up. Still lots of life in that bike.
Suppose its only the one side that is damaged?
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Offline Beebop

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Re: Engine rebuild
« Reply #5 on: June 26, 2014, 04:07:30 pm »
Is the crank or conrod damaged ?
If not I would leave the motor intact and just do pistons, rings, heads etc.
87000 is not high enough mileage to warrant a rebuild.
 

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Re: Engine rebuild
« Reply #6 on: June 26, 2014, 04:15:21 pm »
Last year because my airfilter was so kind to suck itself into the airbox(actaully happens a lot) i had to
do the whole rightside. Rings where so worn away it chowed through the nikasil on the barrel.
New barrel,piston and rings. Also did the valvestemseals and guides with all new gaskets. It was done at 43 000kms.
Cost R18 500 and done by an independant BM maccie.

At 48 000 I had a cold/hot pressure test done. Cold 80/100 out of a 100. Left being 80 right 100(new side)
Hot test both barells where spoton at a 100 both. I did not bother to do anything to the leftside.
Bike uses less oil than before.
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Offline Welsh

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Re: Engine rebuild
« Reply #7 on: June 26, 2014, 04:34:20 pm »
Last year because my airfilter was so kind to suck itself into the airbox(actaully happens a lot) i had to
do the whole rightside. Rings where so worn away it chowed through the nikasil on the barrel.
New barrel,piston and rings. Also did the valvestemseals and guides with all new gaskets. It was done at 43 000kms.
Cost R18 500 and done by an independant BM maccie.

At 48 000 I had a cold/hot pressure test done. Cold 80/100 out of a 100. Left being 80 right 100(new side)
Hot test both barells where spoton at a 100 both. I did not bother to do anything to the leftside.
Bike uses less oil than before.
that's cos you ride like a girl.......
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Offline l3oK

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Re: Engine rebuild
« Reply #8 on: June 26, 2014, 04:42:21 pm »
Right side yes.

See pic for parts list.

I was thinking of using a secondhand barrel and head but not sure where to source these?
 

Offline OomD

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Re: Engine rebuild
« Reply #9 on: June 26, 2014, 04:54:06 pm »
Do you know what caused it to drop a valve? Too high RPM's? Low oil level? Overheat?

How did it happen? I'd hate to think it's something that can just sommer happen??
 

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Re: Engine rebuild
« Reply #10 on: June 26, 2014, 05:04:33 pm »
Start with ACME for secondhand 011 943 3901.
If they do not have try Neil James 083 275 3170. He had 5 rightside barrels when i was looking but i decided to go new.
Yes the barrell is R8500 new without the piston and rings!!
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Offline l3oK

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Re: Engine rebuild
« Reply #11 on: June 27, 2014, 10:17:43 am »
OomD, not sure, was driving in traffic on the way home so not high rpms(altough it has seen the limiter once or twice), checked the oil and it was ok, not to sure about high temps but i've never had issues before.

ChrisL, thanks allot, will give them a call, any reason why you went for new?
 

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Re: Engine rebuild
« Reply #12 on: June 27, 2014, 11:18:04 am »
OomD, not sure, was driving in traffic on the way home so not high rpms(altough it has seen the limiter once or twice), checked the oil and it was ok, not to sure about high temps but i've never had issues before.

ChrisL, thanks allot, will give them a call, any reason why you went for new?
Because the longhaired minister of finance said so :deal:
If you buy a barrell secondhand just make sure it has no honemarks in them.
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Offline EssBee

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Re: Engine rebuild
« Reply #13 on: June 27, 2014, 11:53:28 am »
ChrisL...was that a std airfilter that caused your calamity?
 

Offline katana

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Re: Engine rebuild
« Reply #14 on: June 27, 2014, 05:02:56 pm »
Sub
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Offline the_BOBNOB

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Re: Engine rebuild
« Reply #15 on: June 27, 2014, 05:12:10 pm »
ChrisL...was that a std airfilter that caused your calamity?

yes and why would it only screw up the one side of the engine ???

does each pod have its own air filter ???
 

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Re: Engine rebuild
« Reply #16 on: June 27, 2014, 06:09:12 pm »
ChrisL...was that a std airfilter that caused your calamity?

yes and why would it only screw up the one side of the engine ???

does each pod have its own air filter ???
That answer no one could have answered me up to date.
As mentioned i did a cold/hot pressure test 5000km after the job was done to see what the difference was between the
two silinders.
Yes EssBee standers BM filter.
One person i spoke to was a BM workshop manager and said they get them like that from time to time.When in for a service.
His own HP2 airfilter also got sucked back into the airbox.

Not nice coming back from a great Nam trip to find this when you want to service your bike :eek7: :'(



Rings chowed up by dust but only the compression rings. Up to the moment the bike was opened up it used no more oil
than it used to. The oilring was still good but the edge of the piston touched the barrell and chowed through the nikasil.



The barrell and the little mark where the nikasil was worn through. Look at 12 0'clock cm and half from the edge of the barrell.



Scary part of this is i cleaned the filter at home before leaving for Nam and found the filter like that when i got\
back 4000 kms later.
Never during the whole trip did the bike sound strange or battled to start. Only when I fitted the new filter did it battle
to start.
Why? Because it had only piston that had compression. If you took the airfilter out it would start immedeatly.

It can happed to any 1200 GS. :(
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Offline the_BOBNOB

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Re:
« Reply #17 on: June 27, 2014, 09:30:01 pm »
Ouch!

Pictures like that makes your heart bleed.

And qoutes from dealers like the one above makes you cry like a baby.

They have built more than 0.25mil GS bikes how can 1 cylinder head cost that much ???
 

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Re:
« Reply #18 on: June 27, 2014, 10:15:47 pm »
Ouch!

Pictures like that makes your heart bleed.

And qoutes from dealers like the one above makes you cry like a baby.

They have built more than 0.25mil GS bikes how can 1 cylinder head cost that much ???
To make up for all the free muffins and coffee i suppose >:D :deal:

« Last Edit: June 27, 2014, 10:30:36 pm by ChrisL - DUSTRIDERS »
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Offline Ianbeen

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Re: Engine rebuild
« Reply #19 on: August 17, 2014, 03:38:48 pm »
Did you manage to find parts.....Just as a matter of interest I am also redoing mine. My left side piston wore out and I managed to find a perfectly good set on ebay which I bought. If you are interested I have a right side piston in great condition if you want to make an offer. I will be removing the rings from it though.
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