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April 15th, 2016, 02:47 PM   #51
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Order Thread is in Classifieds under Willing to Buy moniker
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April 16th, 2016, 04:03 AM   #52
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Liners we have a choice Westwood can do it and cheaply but perhaps we should consider Datron and the other one I can't recall the name but they impregnate the iron with silicon carbide

I can ask them for quote:

Obviously we looking at a run of about 12 ?

What's your thoughts spanner on cooling fins and a groove or lip on top for the head gasket ?
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April 16th, 2016, 05:18 PM   #53
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This 105mm piston makes the 628 a 700 right? And with the larger piston a larger diameter liner to accommodate? Sorry for the question so late. Maybe someone can clarify. I had heard there is no need to bore and thought the original piston was 100mm
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April 16th, 2016, 05:59 PM   #54
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Hi Bushie all,
What's your thoughts spanner on cooling fins and a groove or lip on top for the head gasket ?
I myself would like to get a Daton blank and machine it myself.
In my case overheating has never been a problem as I am riding at enough
speed to keep the air flowing through the radiator, so grooves are probably
not a necessary. I would prefer a radius at the bottom of the grove if I was going that way.

I still having a sealing problem, the cylinder is sealed compression wise, but
coolant leaks from the joint a bit, but is not a concern.

I have found a source of correct sized Phuzion gas filled O-rings that I would like to try out as a seal they could be used with a copper gasket of suitable thickness. and would not require the interference pressures of a wire seal.
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April 16th, 2016, 06:00 PM   #55
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Yes 628 will be approx 690cc

Needs iron liner finished at 104.775mm
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Last edited by bushmechanic; April 19th, 2016 at 11:12 PM.
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April 16th, 2016, 06:02 PM   #56
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Thanks spanner good ideas

Yes I think a group order of liners may not be any cheaper but we will see

I'll find out
Cheers

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April 17th, 2016, 12:00 AM   #57
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I've got several liners here.

Taffy
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April 26th, 2016, 09:08 PM   #58
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Also posted in the wanted thread:


It's looking like the end of the first week in May (I have a slow paying client that is supposed to make good by then - even if not, I'll have the dinero from other resources). I'll finalize the list on Friday, complete with "specialty issues" such as coatings and so far, spanner's request for a blank top (haven't heard back on that yet, will call al tomorrow).

Which reminds me, I'll post up paypal instructions too (Piston only) so we can get the ball rolling on contruction. Thereafter, I will request address info so I can calculate shipping rates to the various addresses and send you option on that too! Is that ok with everyone? Frankly, without the darn thing, I can only guess at the shipping anyway. Would rather give complete info than hypothetical and then have to change. I'll acquire quotes from various providers, type (express, semi-express, slow boat to china) rates and send them to everyone specifically for the provided shipping addy.

Sorry for the delay on my end, client owes a substantial chunk of money and only now am I able to offset the delay and pay for the pistons I've comitted to. Again, my apologies, but I'm firm with respect to May 7 commitment. Look for private messages on Friday! Your patience and input has been greatly appreciated (so great it hard to express). BTW, did anyone check if we can get a group rate on the liners?
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April 27th, 2016, 01:19 AM   #59
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im checking goose just very slowly .. sorry

so far its difficult to negotiate a design of o ring grooves outside the normal parameters. the 1.5mm orings that are available in 100mm need very deep grooves that make the liner 0.9mm thick at those points.

i can make my own liner from the datron blank and will go that way with spanner but i will post up details of options of group buy etc when i get a solid answer

IMHO 3 small grooves to take 1mm orings is all that is needed and in the event they are not available just use 1207B in those grooves.

regarding headgaskets i think a 55 - 60 thou copper ring inside a modified oem headgasket with a wire ring in top of the liner is needed.

my thoughts are that a group order of these from someone with water cutter will be the way to go.

will post pictures and drawings asap
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June 4th, 2016, 06:47 AM   #60
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So how did this go?
Any spare pistons made?

I would be interested in one since I have a new 105mm JBS liner lying around.
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