Author Topic: front and center head bolt not leaking after all! Shame on me.  (Read 520 times)

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Offline Don R

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 After repeated attempts to seal the rocker cover it seems the leak is coming from the front center head bolt, 750 K4 engine 836 kit, MLS head gasket, Heavy duty studs,  ideas? copper washer under the bolt head? 
« Last Edit: August 19, 2015, 02:52:45 PM by Don R »
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Offline flybox1

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Re: front and center head bolt leak
« Reply #1 on: August 13, 2015, 08:55:13 AM »
is it the bolt, or the gasket?
pic?
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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"Knowledge without mileage equals bullsh!t" - Henry Rollins

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Offline Don R

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Re: front and center head bolt leak
« Reply #2 on: August 13, 2015, 02:44:41 PM »
 i'll get a pic, the oil seems to be on and around the bolt but anything is possible.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline flybox1

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Re: front and center head bolt leak
« Reply #3 on: August 14, 2015, 09:34:40 AM »
could it be coming up from the area between 2/3 plugs?
there is a almost un-noticeable difference in the 2/3 plug recess cutouts for the valve cover gasket.
if you get this flipped, the 2/3 plug hole area wont seal well.
some gaskets, like vesrah, have a indicator cutout, on the inside edge of the gasket, which when set on correctly, sits over by the #1 cyl intake.
pictured here, along w my review
http://4into1.com/vesrah-valve-cover-gasket-vv-1003-honda-cb750/

if you got this right, why not try some good high temp thread sealant.  I like the ARP brand.
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Don R

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Re: front and center head bolt leak
« Reply #4 on: August 14, 2015, 10:00:16 PM »
 The old gasket has a good squish pattern on it, however I did just toss on the new one. Looks like I need my glasses and a good light.  Thank you.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline Don R

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Re: front and center head bolt leak
« Reply #5 on: August 19, 2015, 02:51:12 PM »
 Well the jokes on me, the leak was the top crankcase vent filter that I extended up under the gas tank, it seems the oil from it dripped onto the rocker cover and ran forward eventually dripping onto the front and center bolt. I do however now have the best rocker cover gasket on it money can buy, the cycle X metal core gasket and allen head bolts.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.