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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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Old 02-08-2010, 09:27 AM
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Default torquing cylinder base nuts....

welp, we all know the cylinder base nuts in the front are a bitch to torque - i use a box end wrench that i've ground way down and just pull till they're really tight. is there a better method? - i thought i could get a crows foot with a torque wrench in there, but there's just no way..

i noticed there's some oil migrating on the old gasket around the 2 front studs, which tells me i didn't torque enough last time i was in there..(or not clean or not flat....) - book says 25Nm which i convert to 20ft-lbs - doesn't seem that tight..


also anyone run no gasket? i was running .3 gasket, and had 2.0 squish. sent head to rb, and he said no go on the head mod (i have 15 degree plug hole..). if i go to to .15 gasket it'll bring squish to 1.85. if i run no gasket, (and just hylomar..) i think i can get close to .03 thickness (according to hylomar site.....) makes 1.72 squish.. - i've used hylomar on 4t's for base gasket and it's worked amazingly well, but i think 4t base gaskets see at lot less heat/pressure than a 2t..... i know all this will change my port height, which i'm cool with, more low end is always nice on a 200..


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Old 02-08-2010, 09:41 AM
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I cut a 13mm box-end wrench and welded it to a socket and use that with my torque wrench.
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Old 02-08-2010, 10:47 AM
einsteingarage einsteingarage is offline
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I use a KTM bottle opener which is really a cylinder nut wrench (13mm) made to go on a torque wrench as an extender. You could pick one up for a couple bucks because everyone thinks it's a bottle opener.
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Old 02-08-2010, 11:20 AM
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this?

http://www.ktm-parts.com/mm5/merchan...de=50329071100

it doesn't appear to have a hole for a torque wrench?
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Old 02-08-2010, 12:37 PM
einsteingarage einsteingarage is offline
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Yup just double check that the nuts are 13mm on your cylinder.

He is a post I did about it on KTM talk

http://ktmtalk.com/index.php?showtopic=201040&st=0


scroll down to picture to see how it works, don't forget to figure out the extension torque formula
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Old 02-08-2010, 12:39 PM
kendunn kendunn is offline
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Adapters don't give very accurate reading as it changes the distance. You are actually not even supposed to use extensions on torque wrenches. I just try and tighten them all pretty much the same and let it go and have never had a problem. I am much more particular on my heads however. The best thing you could do is get a 12 point wrench that you could drill a hole 12" from the center of the box end. Take a spring scale and and put it through the hole and pull until you get the reading you want. That's where ft/lbs comes from.

I tried using permatex as a base gasket once on my Gasser but it didn't hold for long. I had used it on a CR250 (2t) years ago and it worked, but only lasted 4-6 hours on the GG.
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Old 02-08-2010, 12:40 PM
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welp, i got the squish to 1.75 with the .15 base gasket. haven't checked compression yet, and it'll probably get a tiny bit tighter when i actually torque the head..
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Old 02-08-2010, 05:15 PM
skid jackson skid jackson is offline
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iirc ....
i used a regular 13mm open end and box end wrench. One end fit over the nut the other end fit the square thingy on my 1/2 drivew craftsman torque wrench. I think i had to grind the open end a bit to get it to fit. Motion pro has a chart thing you can down load to figure the extension effect.
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Old 02-09-2010, 06:10 AM
rpduc rpduc is offline
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Similar situation with the head nuts on Ducati motors and what I've been told is: If you increase length on the lever arm/torque wrench with an extension you have to correct for that. But, if you mount the extension at a 90 degree angle to the torque wrench no correction is needed because you have not increased the length at which you are applying torque. I haven't actually tested it with a scale, but I know that's the way it's commonly done on the Ducs and it's the way I do it on my GG. I ground down a 13mm box end and welded a socket to one end so it would mount at 90 degrees.
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Old 02-09-2010, 06:15 AM
einsteingarage einsteingarage is offline
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The best way to think of it is if you are extending the length of the handle away from what you are torqueing then you have to change the torque. I you are not like a socket with a long extension(height) then you don't have to change it because the handle you are pulling on is the same lenght away from the nut.
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