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Post subject: An oddity
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Baldyboy  Regular Racer Joined: 08 Nov 2007 Total posts: 382 Location: Coventry |
Got all my 4 sets of barrels out to measure them.
And i have a set of 350 barrels that have been machined down about 4mm at the base, so that it cuts through the 347cc casting, there not really any good, but why would someone do this?????
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Posted: Wed Jun 04, 2008 6:33 pm
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| jmw |
It's the way SS used to make 'big bore' 375cc kits.
You had to do this to the barrels to accept the DT MX piston
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Posted: Wed Jun 04, 2008 6:38 pm
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BaldyboyRegular Racer Joined: 08 Nov 2007 Total posts: 382 Location: Coventry |
So if i measure it buy new dt pistons can have a 375cc
Cool thanks for that, on std, rods i take it?
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Posted: Wed Jun 04, 2008 7:38 pm
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| jmw |
| Baldyboy wrote: |
So if i measure it buy new dt pistons can have a 375cc
Cool thanks for that, on std, rods i take it? |
Well, in theory yes.
The 'big bore' kit wasn't sold as a performance upgrade but more of a 'gone past max o/s' and need a solution thing.
You need the right DT175MX piston and have to machine the skirt a bit to get it to fit etc.
I couldn't tell you exactly as I've always thought it a waste of time because the DT piston was quite frail and cracked often.
Alot of people here swear by standard sized pistons saying they run smoother but thats a matter of opinion - up to you really.
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Posted: Wed Jun 04, 2008 7:46 pm
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BaldyboyRegular Racer Joined: 08 Nov 2007 Total posts: 382 Location: Coventry |
Got what i thought was 4 sets of barrels, but in reality, one set are scrap and i mean scrap, liner has cracked and split and on +2.0, one set are machined down for the 375 (as i have just found out)
One are on +05, but have seized fairly major time and probably need taking out to +1.5 and one are on +1.5.
So going to have to do some seroius thinking.
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Posted: Wed Jun 04, 2008 7:50 pm
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Vindaloobeast  Rear-wheel Steering! Joined: 25 Aug 2005 Total posts: 2623 Location: Gloucester |
The split one can be refurbished successfully...dont chuck it away.
Beast.
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Posted: Wed Jun 04, 2008 8:46 pm
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| jmw |
I'd send the set at +1.5 to Farnham and ask him to sort them out
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Posted: Wed Jun 04, 2008 8:48 pm
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Billy One-handed Stoppie! Joined: 12 Oct 2007 Total posts: 2216 Location: Sweden arise! |
Got a pic? I have no idea what you're gaggling about but i wanna see just out of curiosity. 
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Posted: Wed Jun 04, 2008 9:36 pm
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| p51bombay Joined: 23 Jan 2004 Total posts: 9909 |
Rumour has it someone in Japan is pressing in aluminum liners and plating them - endless supply of std bores. 
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Posted: Wed Jun 04, 2008 10:35 pm
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| xen-uno Joined: 27 Jul 2005 Total posts: 845 |
Yeah ... that's cool on the Al liner. I would imagine they're fragile at the cyl bottom where the liner projects out, if port geometry is maintained. A WC'd CR250 factory nikasil'd (apparently very rare) I saw was around 1/2" thick at the projection.
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Posted: Wed Jun 04, 2008 10:52 pm
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kaptainkaos Daily Burner Joined: 14 Aug 2007 Total posts: 207 Location: Out o' there an' over 'ere |
| p51bombay wrote: |
| Rumour has it someone in Japan is pressing in aluminum liners and plating them - endless supply of std bores. |
Pray tell us more...
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Posted: Wed Jun 04, 2008 11:17 pm
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| p51bombay Joined: 23 Jan 2004 Total posts: 9909 |
Don't really know much more - I read it either here or the yank board but forget which.
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Posted: Wed Jun 04, 2008 11:19 pm
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