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02-07-2016, 08:10 PM | #121 |
Anglo-Saxon Warrior
Join Date: Aug 2002
Location: North Yorkshire
Bike: M900
Posts: 2,485
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The DP pistons look fine, a bit of a clean, polish and maybe a bit of weight removed they will be just right.
Yorkie
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11-07-2016, 05:53 PM | #122 |
Anglo-Saxon Warrior
Join Date: Aug 2002
Location: North Yorkshire
Bike: M900
Posts: 2,485
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Both sets of pistons have arrived, so hopefully the engine will be together by the end of the Month!!
Yorkie
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11-07-2016, 06:22 PM | #123 | |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,936
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Quote:
Back in the day when I used to rebuild parallel twins of various sorts, I used to sometimes have the crankshaft dynamically balanced to the piston and conrod assys. Especially if the pistons were a lot different weight to those originally fitted. I imagine the dynamic balance on an L twin is probably less of an issue than on a parallel twin, but still an issue....My thinking is that lightening the pistons for lightening's sake might not necessarily be a good thing? Not being familliar with Ducati pistons, I was also wondering if the valve cut-outs are a standard feature, or if the ones in the DP pistons would serve to avoid piston to valve contact if a belt went?
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11-07-2016, 08:27 PM | #124 | |
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Join Date: Sep 2010
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Quote:
Even with shipping costs etc. they're still cheaper than Ducati.
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M900, 916, LeMans II. |
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11-07-2016, 10:24 PM | #125 | |
Anglo-Saxon Warrior
Join Date: Aug 2002
Location: North Yorkshire
Bike: M900
Posts: 2,485
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Quote:
Yorkie
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12-07-2016, 08:23 AM | #126 | |
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Quote:
Free is good (especially for a Yorkshireman)...
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M900, 916, LeMans II. Last edited by Dukedesmo; 12-07-2016 at 08:42 AM.. |
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12-07-2016, 05:28 PM | #127 | |
Anglo-Saxon Warrior
Join Date: Aug 2002
Location: North Yorkshire
Bike: M900
Posts: 2,485
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Quote:
There is definitely a little more material, the crank has already been balanced. Yorkie
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13-07-2016, 05:23 PM | #128 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,936
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Thanks..I see now.
They certainly look a bit chunkier...Hope you can get them down to wieght without making any weak spots...
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13-07-2016, 05:38 PM | #129 | |
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Join Date: Sep 2010
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Bike: M900
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Quote:
Not sure it's a good idea to machine off the high-comp part to get standard compression, or am I reading this wrong?
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13-07-2016, 06:15 PM | #130 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,085
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I'm sure Yorkie knows what's what. Rather than chop them to save weight I'd be inclined to get them both as close weight wise to each other as possible, so they are well balanced.
I would also hope that they are the correct type for the oil cooling of the engine as a mate did a similar conversion on his 900 SS and melted both pistions within 200 miles since not enough oil was cooling them.
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13-07-2016, 06:47 PM | #131 |
Anglo-Saxon Warrior
Join Date: Aug 2002
Location: North Yorkshire
Bike: M900
Posts: 2,485
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The Hi-Comps are 944 will be lightened from underneath just to get it to the same weight as the standard.
They will then slot straight into the ST2 engine as part of the rebuild. Yorkie
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13-07-2016, 08:55 PM | #132 |
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OK I understand now, I had initially thought you were machining the high domed pistons flat.
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04-08-2016, 06:00 PM | #133 |
Anglo-Saxon Warrior
Join Date: Aug 2002
Location: North Yorkshire
Bike: M900
Posts: 2,485
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Back on the project Saturday, its been nearly a month since I did anything. Some tyres arrived today and they seem to be good quality:
At £134 for the pair they had to be worth a try. 190/55/17 rear and a 120/70/17 front. I all goes well they will be fitted to the rims on Saturday, and the engine should be fully together. Yorkie
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04-08-2016, 06:21 PM | #134 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
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Yea, they look good especially for that price. I'm with you on the 120/70 front but the rear is oversized I think, does that cause any handling issues in your experience or are you experimenting?
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04-08-2016, 06:30 PM | #135 |
Anglo-Saxon Warrior
Join Date: Aug 2002
Location: North Yorkshire
Bike: M900
Posts: 2,485
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I have been using 190's for a while and have had no issues. I like them because they slow the steering down. It is the first time I have used Maxxis tyres though, but they feel really sticky.
Yorkie
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