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June 9th, 2017, 02:19 AM   #51
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Originally Posted by Taffy View Post
don't even go there!

I would never put THAT piston in a 650. it's a 470 I think and we don't touch them, they are too low.

also, it's simple now, the valve timing was retarded. what you want to do is do the same test with it delayed one tooth and then if you have too: 2 teeth. knowing how it happened will help lay down your fears.

it could be a combo of a tooth out at the bottom and another at the top etc.

don't even start bludgeoner!

Taffy
You really think that's neacesarry after he's checked the piston to valve clearance ?

The valve timing was bludgeons doing. All clear and simple if you Read The thread from the start

Who done it ? It wasn't me precious. Gollum gollum, nasty shire folks
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June 10th, 2017, 02:47 AM   #52
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Originally Posted by Taffy View Post
don't even go there!

I would never put THAT piston in a 650. it's a 470 I think and we don't touch them, they are too low.

also, it's simple now, the valve timing was retarded. what you want to do is do the same test with it delayed one tooth and then if you have too: 2 teeth. knowing how it happened will help lay down your fears.

it could be a combo of a tooth out at the bottom and another at the top etc.

don't even start bludgeoner!

Taffy
I think you might have jumped to the wrong conclusion Taffy - I wasn't implying it was anyone on this forum. I know someone who previously owned/raced it, and they probably built it too, but that was going back a bit and it's had at least one other owner since, so anything could have been done to it. There's nothing wrong with the engine anyway apart from the original water pump seal failure (hopefully!). The rest was down to my ham fistedness - at least I'll be changing the head gasket as well now. I appreciate all advice given on here, and I'll most likely need plenty more of it! Cheers
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June 10th, 2017, 08:25 AM   #53
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Originally Posted by bushmechanic View Post
Who done it ? It wasn't me precious. Gollum gollum, nasty shire folks
its the signature of a norverner he put that piston in many a racer and never checked the compression mathmatically....but i have.

anyone wanna guess what the compression is with the 470 piston in?

go on, I bet nobody can get it in the first 5 goes.....

Taffy

Last edited by Taffy; June 11th, 2017 at 01:49 AM.
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June 10th, 2017, 11:40 AM   #54
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15
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June 11th, 2017, 01:46 AM   #55
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nope, keep guessing. UPWARDS!

and bludgeoner: there are people on here that think that 'well known....' blah blah is me. so you need to be a little clearer. that was wrong OK?

several people (present company not included) who are not only mentally deluded but seriously sick! jesus, i thought Schwim was weird but at least he's harmless FFS!!!!

come on you lot, join in!!!!!!!!!!!

remember: deisels have a compression of over 18 to 1 (trying to remember college and 40 yeasrs later)

cheers

taffy
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June 11th, 2017, 02:42 PM   #56
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Ok there is very little chance that a 550 berg engine with static Comp over 15:1 will last even 4 hours

Show us The calculations please taffy

You will find that it's more like 13 or 14 :1 and with this cam that is not a stupidly high CR

And IMHO bludgeoner posted nothing at all to imply this is your work.

You are overley paranoid That is wrong ok

Last edited by bushmechanic; June 11th, 2017 at 10:25 PM.
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August 24th, 2017, 12:09 PM   #57
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Please help - I'm losing the will to live.....!
Put it all back together and back in the bike last week. New head gasket, camchain + camshaft bearings, head bolts all torqued down to spec. New water pump seal and both o-rings. Fresh oil in, started and ran it for a minute, dropped the oil (to get rid of the last water contaminated oil). New oil and filter in, ran it for a minute, oil looked good. Filled the cooling system (just water), started it again and immediately got water mixing with the oil
Ok, so maybe not careful enough! Today - clutch casing off again, new water pump seal and both o-rings again. I was extremely careful about this - shink wrap and smear of grease on the shaft, smear of grease on both o-rings, very carefully refitting the casing. Filled/started/drained oil 4 times to make sure all the water was gone again. 5th time with new oil tried introducing water again and immediately got milky oil again
Is there anything else it could be - something I'm missing? Can only be the head gasket or the pump seal doing this right?
It's not the expense - it's the time that hurts.....
Runs beautifully by the way!

Last edited by BLUDGEONER; August 24th, 2017 at 12:10 PM. Reason: more info
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August 24th, 2017, 01:48 PM   #58
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the water jacket O ring could be undersize? the left cover gasket can be fatter and then the W/J |O ring then defo becomes undersize!

can cooland come out of the little front hole or is that blocked?

Taffy
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August 24th, 2017, 02:02 PM   #59
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I hope it's those but it Can be liner o rings or cracked liner. Look for crack on the outside of the liner just under the flange at the top

Also when you have the clutch cover off Check the depth of the little o ring slot on the left hand crank case then measure the Thickness of the o ring. You would like to have about 1mm crush. Sometimes the groove is way too deep.
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August 24th, 2017, 02:04 PM   #60
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Taffy where are your calculations for the compression ratio of a 550 with the 470 piston ?

You thought it was a 650 right ?
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