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October 12th, 2016, 02:08 AM   #11
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Originally Posted by ksithumper View Post
Can anyone guide me on the cam bearings -I know they are 6201-2rs, but should they be C3 clearance, or standard? thanks!
Not sure of the answer, but have you checked the manuals? They're on the site as well as collected on Google Drive, see my sig!
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October 27th, 2016, 02:25 PM   #12
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The frame is not damaged - the usual paint rubs, but nothing too bad. A quick new coat of blue paint and it is looking good.
Back to the engine now, and specifically Taffy's new decompressor spring. When installed normally it has no preload, so I assume it needs to be pre-wound 1 turn. That isn't easy as it is very fiddly. . Am I missing something ?
Thanks in advance for the guidance!
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November 10th, 2016, 02:05 PM   #13
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With preload, I tested the spring by holding the cam in my milling machine and increasing the speed until the decomp moved. It starts to open at about 360rpm (720rpm crank speed) which sounds fine as I guess idle will be 1200rpm+.

Hopefully I can get the engine back together this weekend.
Thanks from tourist
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November 10th, 2016, 02:40 PM   #14
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Originally Posted by ksithumper View Post
With preload, I tested the spring by holding the cam in my milling machine and increasing the speed until the decomp moved. It starts to open at about 360rpm (720rpm crank speed) which sounds fine as I guess idle will be 1200rpm+.

Hopefully I can get the engine back together this weekend.
I might be missing something here but shouldn't that decomp be only moving at higher revs than max cranking speed? Otherwise it wouldn't be working right?

Damo
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November 10th, 2016, 03:58 PM   #15
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i have a video of the fitment on my Facebook page. can't say fairer than that! sharing the l-u-r-v-e!!!

regards

Taffy
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November 10th, 2016, 05:11 PM   #16
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Originally Posted by Damo W View Post
I might be missing something here but shouldn't that decomp be only moving at higher revs than max cranking speed? Otherwise it wouldn't be working right?

Damo
The decomp works when the engine is below idle so the starter can turn the cylinder around due to lower comp. As soon as the engine starts the weight is flung outwards disabling the decomp.
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November 10th, 2016, 09:00 PM   #17
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Originally Posted by jon andersson View Post
The decomp works when the engine is below idle so the starter can turn the cylinder around due to lower comp. As soon as the engine starts the weight is flung outwards disabling the decomp.
Indeed, I was just trying to deliver it diplomatically.

Damo
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November 11th, 2016, 01:46 AM   #18
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Originally Posted by ksithumper View Post
Can anyone guide me on the cam bearings -I know they are 6201-2rs, but should they be C3 clearance, or standard? thanks!
Hi

No one answered to you, so, use C3 on everything and C4 on the mains.

Cheers
ZAGA
Thanks from tourist and ksithumper
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November 11th, 2016, 12:42 PM   #19
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Originally Posted by Damo W View Post
I might be missing something here but shouldn't that decomp be only moving at higher revs than max cranking speed? Otherwise it wouldn't be working right?

Damo
Sorry Damo, I didn't explain that very well!
The decomp starts to close at 360 camshaft rpm, which is 720 crankSHAFT rpm. That is good, because it is well below idle, but well above the likely starter motor crankING speed.

Last edited by ksithumper; November 11th, 2016 at 12:46 PM.
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November 11th, 2016, 01:16 PM   #20
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Originally Posted by Taffy View Post
i have a video of the fitment on my Facebook page. can't say fairer than that! sharing the l-u-r-v-e!!!

regards

Taffy
Thanks Taffy, wish I had seen that earlier - it would have saved me a bit of head scratching!
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