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September 10th, 2014, 04:43 AM   #101
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Originally Posted by bushmechanic View Post
nice Crank Jar, thanks for the tip

what did you use for the big end pin / rod ?
Heh...I'm too cheap for Carillo so I went with a ProX Rod & Pin.
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September 11th, 2014, 02:59 AM   #102
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jar944, are you going to turn it down?

What cases are you putting it in?

Cheers spanner
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September 11th, 2014, 03:53 AM   #103
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Originally Posted by spanner View Post
jar944, are you going to turn it down?

What cases are you putting it in?

Cheers spanner
Yes, as well as "pork chop" it. The goal is sub 4000g. Its actually going in a KTM RFS
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September 11th, 2014, 09:42 PM   #104
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78mm stroke x 105 piston = 675cc
78mm stroke x 108 piston = 714cc
76mm stroke x 108 piston = 696cc
Just thinking
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September 12th, 2014, 07:08 PM   #105
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nice one Jar

not sure if you noticed Dr_C s thread is still going, just not on the front page, looks like cranks and pins are next

Billet cylinder head
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September 13th, 2014, 04:23 PM   #106
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Originally Posted by bushmechanic View Post
nice one Jar

not sure if you noticed Dr_C s thread is still going, just not on the front page, looks like cranks and pins are next

Billet cylinder head
Yep. Subscribed to his YouTube to get updates.
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September 18th, 2014, 02:54 AM   #107
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so first impressions of the 0.62 balance factor on the 80mm crank at 100mm bore are very good

the main thing i noticed when i first did 0.75 and no CB was vibration through the footpegs below 3000rpm

then tried 0.58 was better, then 0.55 which was worse

its a different build with lighter parts but this one at 0.62 has very little vibration through the pegs

engine feels very strong and revs up quick with the small loads im giving it, will see what its like after the weekend when i start revving the tits off it.
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September 20th, 2014, 09:49 PM   #108
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upper rpms are also quite good

engine responds more like a jap 450 MX bike than the stock 650

possibly more "buzzy" vibration through the bars at high rpm than my 700 but its a different chassis/bars etc
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September 22nd, 2014, 10:48 AM   #109
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Good to hear about the positive results, Bushie!
I have just measured my 80mm crank, 145mm Carillio and 104mm JE piston, which are all quite heavier than OEM!
Left hand side web "imbalance": 442,6g
Right hand side web "imbalance": 455,4g
Piston, rings, pin and clips: 440,8g
Conrod: 393g
Crank pin and bearing: 392,4g
If I add the two webs "imbalances" and withdraw the crank pin and bearing weight, that would sum up to the total "imbalance" of the crank, right? (442,6+455,4-392,4=505,6). The reciprocating mass would be rod and piston together (440,8+393=833,8 ). Then the BF would be "crank imbalance"/"reciprocating mass" (505,6/833,8=0,606). Does this make any sense, or do I really need to cut down on my Pilzsaft consumtion?
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Last edited by Dr_C; September 23rd, 2014 at 01:20 AM.
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September 22nd, 2014, 03:26 PM   #110
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it looks good but im not sure mats

i'll have another look after Ive had a few bottles

my sober gut feeling is that if you add weight to the piston and rod then the balance factor moves toward zero rather than 100%

so more like 0.4 ... something rather than 0.6

Last edited by bushmechanic; September 22nd, 2014 at 03:50 PM.
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