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06-14-2012, 08:11 AM
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#1 |
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Adventurer
Joined: Jun 2012
Oddometer: 31
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R100 Exhaust Rocker Arm Bluing
Hi guys, first post here.
Just bought a 29k 1978 R100/7, and I was going through the mechanicals and fluids and came across this:  This is the right side exhaust rocker arm, and none of the other arms show any similar signs. Push rods rotate freely and smoothly at TDC compression for both sides, and there doesn't seem to be anything wrong with the valve guide or the valve stem. The valve clearances were the same right and left, though the exhaust ports were about .18mm and .15mm is called for on r100 so I re-set to .15 after adjusting end play. No signs of trouble yet, but I'm wondering if this is bad news? Thanks, Ryan |
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06-14-2012, 08:18 AM
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#2 |
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Along for the ride
Joined: Nov 2008
Location: Vancouver Island
Oddometer: 912
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They all look like that, part of the hardening process.
__________________
__________________________________________ "There's a fine line between a skinning and a shearing" |
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06-14-2012, 08:25 AM
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#3 |
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Ride On
Joined: Jul 2009
Location: USA
Oddometer: 1,049
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I wondered the same thing once about a bike I bought w/ no valve lash after riding it several hundred miles home ( brought zero tools as it was "ready to go x-country...). I was assured it was fine by a "guru" of sorts; no issues to date & 20k miles.
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Opinions are like internet connections- everybody has one. |
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06-14-2012, 08:29 AM
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#4 | |
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the thread-killer
Joined: May 2008
Location: HIGH desert
Oddometer: 4,297
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Quote:
That process started in late 1976 (IIRC). |
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06-14-2012, 08:32 AM
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#5 |
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call me iggy
Joined: Aug 2010
Location: Mid-South, M-town
Oddometer: 600
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Not bad news now that you have it adjusted properly, but someone let it get (or set it) too tight at some point.
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Current: 93 R100GS, 04 XR650L Prior: 73 CB350, 77 R100/7, 83 R100RTI love every motorcycle I've owned and even some that I haven't. |
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06-14-2012, 08:58 AM
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#6 |
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More tacos than you
Joined: Mar 2008
Location: Manzanillo MX, occasionally Seattle
Oddometer: 5,103
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That rocker looked like that before it was ever in a bike. They heat treat the tips to harden them.
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R80ST Gets The HPN Treatment Ducati Pantah 500SL Rebuild Seattle to TDF on an airhead WTB R100R Mystic sidestand and mount. |
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06-14-2012, 09:08 AM
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#7 |
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Adventurer
Joined: Jun 2012
Oddometer: 31
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Thanks, this is a relief. Strange that it's only this one arm with visible bluing, but I'll rest assured now.
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