Tech Forums > SOHC/4 Bikes
brandEn's leak free top end thread = Tips, Tricks and Suggestion encouraged
MCRider:
--- Quote from: flybox1 on September 22, 2016, 06:29:28 AM ---
--- Quote from: turkey4me on September 22, 2016, 03:46:13 AM ---No 8 O-rings on are listed as being 11 x 2.5mm. Can anyone confirm if 11mm is the inside or outside diameter? Buna or Viton?
--- End quote ---
11mm is the ID. Use viton.
--- End quote ---
I think the 2.5mm is the cross section of the ring material. That makes the OD 13.5mm. OCICBW
flybox1:
--- Quote from: MCRider on September 22, 2016, 07:59:59 AM ---
--- Quote from: flybox1 on September 22, 2016, 06:29:28 AM ---
--- Quote from: turkey4me on September 22, 2016, 03:46:13 AM ---No 8 O-rings on are listed as being 11 x 2.5mm. Can anyone confirm if 11mm is the inside or outside diameter? Buna or Viton?
--- End quote ---
11mm is the ID. Use viton.
--- End quote ---
I think the 2.5mm is the cross section of the ring material. That makes the OD 13.5mm. OCICBW
--- End quote ---
You are almost correct. 2(CS)+ID = OD
2(2.5) + 11 = 16mm in this case ;)
MCRider:
--- Quote from: flybox1 on September 22, 2016, 10:40:00 AM ---
--- Quote from: MCRider on September 22, 2016, 07:59:59 AM ---
--- Quote from: flybox1 on September 22, 2016, 06:29:28 AM ---
--- Quote from: turkey4me on September 22, 2016, 03:46:13 AM ---No 8 O-rings on are listed as being 11 x 2.5mm. Can anyone confirm if 11mm is the inside or outside diameter? Buna or Viton?
--- End quote ---
11mm is the ID. Use viton.
--- End quote ---
I think the 2.5mm is the cross section of the ring material. That makes the OD 13.5mm. OCICBW
--- End quote ---
You are almost correct. 2(CS)+ID = OD
2(2.5) + 11 = 16mm in this case ;)
--- End quote ---
Oh yeah, silly me. :D
PeWe:
One more thing that most likely is the bandit on oil weeping CB750 K6 setups. Crank case breather
Crank case breather is connected to oil tank via a 1/2" hose, oil tank itself is sealed, no breather. Honda made a mistake here. This will cause oil weeping engine, more cc and rpms more it will weep/leak.
I found out after over 30 years! I have blamed versions of case seal when the biggest cause is no ventilation of the crank case. I trusted the Honda design. Even cars will run as crap with crank case breather problems.
I'll cut the hose between crank case spigot and oil tank, connect with a T-pipe where I'll add another 1/2" hose going upwards and connect with the breather hose from valve cover. Cut that hose too and add a second t-pipe. Top breather hose from valve cover will still end up beside the exhaust as before.
Hondaman recommend to route that hose to the front drive sprocket to lubricate with the oil drops coming here. The hose must be slimmer where it enters the cover opening.
http://forums.sohc4.net/index.php/topic,147504.msg1680491.html#msg1680491
Edit: My K6 has not the later breather as K7 has and shown beside the airbox. Also shown in Hondamans post above.
https://www.cmsnl.com/honda-cb750k7-four-european-direct-sales_model14391/partslist/F15.html#results
Scott S:
Since this one is referred to so often and I go back to it myself, I'm setting it as a sticky. If anyone does a top end, can you take pics and add them to this thread, since Photobucket is holding the pics hostage?
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