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Author Topic: 1977 cb750f2 (915cc)  (Read 240522 times)

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Offline Tintop

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Re: 1977 cb750f2 (915cc)
« Reply #825 on: November 25, 2012, 07:57:30 PM »
If you want an LED tail light with built in signals this is almost a perfect fit for that seat.  It's what I used -
http://www.customdynamics.com/Yamaha_tail_retro.htm#2002-2005_Yamaha_Road_Star_Warrior_Integrated_LED_Taillight_
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1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline DarcyB

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Re: 1977 cb750f2 (915cc)
« Reply #826 on: January 20, 2013, 09:45:42 PM »
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My build http://forums.sohc4.net/index.php?topic=116471.0

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Offline tweakin

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Re: 1977 cb750f2 (915cc)
« Reply #827 on: April 03, 2013, 05:24:18 PM »
So the bike will be going back under the knife for some needed love.  I started to get some white smoke on hard deceleration after frying my coils when I was stuck in downtown Seattle traffic (the one 90+ degree day) last year.  I think the excessive heat may have damaged my valve seals causing a bit of oil to seep past, causing the annoying smoke.  I was hesitant to even bother with replacing the seals at first because the 915 fires right up with one tap of the starter and seems to just be getting stronger and stronger as it loosens.   I just have WAY too much into this build for even the slightest amount of smoke.

The 75 scrambler project will have to be put on hold for a bit, but the sick part of me is looking forward to tearing back into the cafe...

THANKS to Mike Rieck for expediting me some new valve seals that will fit the 5mm conversion valves!  I know everyone on the forum already knows it, but your the man! 8)

« Last Edit: April 03, 2013, 05:26:20 PM by tweakin »
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Offline brandEn

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Re: 1977 cb750f2 (915cc)
« Reply #828 on: April 03, 2013, 05:28:32 PM »
teardown Tige in da house!
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Offline tweakin

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Re: 1977 cb750f2 (915cc)
« Reply #829 on: April 03, 2013, 07:03:06 PM »
Quote from: brandEn on April 03, 2013, 05:28:32 PM
teardown Tige in da house!

Yep, she is back on the lift...

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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: 1977 cb750f2 (915cc)
« Reply #830 on: April 03, 2013, 08:59:52 PM »
Oh jeez, did I jinx you? Please let me know what you think of the 915 when you get inside it! Sending some of those good vibes back your way....
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline FunJimmy

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Re: 1977 cb750f2 (915cc)
« Reply #831 on: April 03, 2013, 11:26:47 PM »
Nice way to end spring break Tige.
White smoke is usually caused by water in the combustion chamber.
May be you're head gasket.
When did you slip water jackets in the cylinders?
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Offline tweakin

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Re: 1977 cb750f2 (915cc)
« Reply #832 on: April 04, 2013, 07:12:07 AM »
Quote from: Jerry Rxman Griffin on April 03, 2013, 08:59:52 PM
Oh jeez, did I jinx you? Please let me know what you think of the 915 when you get inside it! Sending some of those good vibes back your way....

No you didn't jinx me, ha ha. 

All should be fine once I get the new seals on.  I will break into it today and do a little inspection, clean and prep for the seals.  Thanks for the good vibes.
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Offline tweakin

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Re: 1977 cb750f2 (915cc)
« Reply #833 on: April 04, 2013, 07:15:29 AM »
Its funny Jim, I am looking forward to wrenching on the 915, might paint the head black to match the rest of the engine.  The white smoke on decel is more than would be expected by water in the combustion chamber.  Plus, I am color blind so I am sure there is a blue tint to the smoke I am just not seeing...

Quote from: FunJimmy on April 03, 2013, 11:26:47 PM
Nice way to end spring break Tige.
White smoke is usually caused by water in the combustion chamber.
May be you're head gasket.
When did you slip water jackets in the cylinders?
« Last Edit: April 04, 2013, 07:26:29 AM by tweakin »
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Offline iron_worker

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Re: 1977 cb750f2 (915cc)
« Reply #834 on: April 04, 2013, 07:19:51 AM »
The other issue that is over looked here is that these are air cooled bikes ... where is this water coming from? lol

IW
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Offline knowsnothing

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Re: 1977 cb750f2 (915cc)
« Reply #835 on: April 04, 2013, 07:37:13 AM »
Quote from: iron_worker on April 04, 2013, 07:19:51 AM
The other issue that is over looked here is that these are air cooled bikes ... where is this water coming from? lol

IW

A super humid day  :P
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1978 CB750k Green - 811 engine
1978 CB750k Blue - for sale
1974 CB375F Faded Black - had to have that 6th gear
1976 CB400F Red - in many pieces
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Offline MCRider

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Re: 1977 cb750f2 (915cc)
« Reply #836 on: April 04, 2013, 09:57:51 AM »
Quote from: knowsnothing on April 04, 2013, 07:37:13 AM
Quote from: iron_worker on April 04, 2013, 07:19:51 AM
The other issue that is over looked here is that these are air cooled bikes ... where is this water coming from? lol

IW

A super humid day  :P

Seriously...condensation. A cold pipe will condense water by products of combustion into white smoke. Even on aircooled engine.  However this is often wishful thinking as it was on my engine. White smoke from condensation should go away after everything heats up.

Mine did not. Easy to want to mistake white for blue.   :(

Further, if you don't let it heat up thoroughly, it will condense into water and rust out your pipes. Which is why starting it for short periods during storage is not recommended.

This is why one often sees water dripping from the tailpipe of a car just started. Even though the cooling system is intact.
« Last Edit: April 04, 2013, 09:59:49 AM by MCRider »
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Offline tweakin

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Re: 1977 cb750f2 (915cc)
« Reply #837 on: April 04, 2013, 05:00:13 PM »
Tear down and inspection is complete and all looks good, I was initially concerned that I may have some internal damage. :-\ 

Now just waiting on a few seal so I can put her back together and ride.
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Offline tweakin

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Re: 1977 cb750f2 (915cc)
« Reply #838 on: April 21, 2013, 04:03:12 PM »
Valve seals replaced, test ride complete.  All is good.  Also got motivated to clean up the garage and liquidate some of the CB parts I was hoarding,,,,only the parts I will never use.

Now back to the 75 scrambler build, my little girls are starting to put pressure on mr to complete.
« Last Edit: April 21, 2013, 04:05:29 PM by tweakin »
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Offline MOONDOGNYC

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Re: 1977 cb750f2 (915cc)
« Reply #839 on: May 11, 2013, 09:26:03 AM »
Tweakin, I am truly blown away by this bike. I too have a 77 F, but nowhere near yours, I can assure you.
 What I do have, is the same seat pan, however. Can you show some shots of the underside of it ? I am trying to explain to my upholsterer that the lip will sit under the tank, but we are both having a tough time figuring out how to get it under the tank without the material getting chaffed. 
  Can you shed some light on this ?   

Again, amazing build !
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1977 CB750F

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: 1977 cb750f2 (915cc)
« Reply #840 on: May 11, 2013, 10:19:13 AM »
Another thing you can do is to install a piece of clear bra on the bottom back edge of the tank to protect the tank's paint and the seat.
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline MRieck

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Re: 1977 cb750f2 (915cc)
« Reply #841 on: May 11, 2013, 12:55:14 PM »
Quote from: Jerry Rxman Griffin on May 11, 2013, 10:19:13 AM
Another thing you can do is to install a piece of clear bra on the bottom back edge of the tank to protect the tank's paint and the seat.
Sounds kind of kinky Jerry BUT that is what you are all about. ;) ;D
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Offline tweakin

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Re: 1977 cb750f2 (915cc)
« Reply #842 on: May 12, 2013, 06:56:39 AM »
Thanks for checking out my build.   It is a tight fit under the tank for sure, I will try to snap some shots today and post them up.

Quote from: MOONDOGNYC on May 11, 2013, 09:26:03 AM
Tweakin, I am truly blown away by this bike. I too have a 77 F, but nowhere near yours, I can assure you.
 What I do have, is the same seat pan, however. Can you show some shots of the underside of it ? I am trying to explain to my upholsterer that the lip will sit under the tank, but we are both having a tough time figuring out how to get it under the tank without the material getting chaffed. 
  Can you shed some light on this ?   

Again, amazing build !
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Offline tweakin

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Re: 1977 cb750f2 (915cc)
« Reply #843 on: May 12, 2013, 06:56:59 AM »
+1
Quote from: MRieck on May 11, 2013, 12:55:14 PM
Quote from: Jerry Rxman Griffin on May 11, 2013, 10:19:13 AM
Another thing you can do is to install a piece of clear bra on the bottom back edge of the tank to protect the tank's paint and the seat.
Sounds kind of kinky Jerry BUT that is what you are all about. ;) ;D
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Offline MOONDOGNYC

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Re: 1977 cb750f2 (915cc)
« Reply #844 on: May 12, 2013, 12:51:36 PM »
Thanks so much Tweakin'...really appreciate that. it is the only thing I have left to do.


Jerry...post pix of your description also please...    ;)
« Last Edit: May 14, 2013, 05:06:39 PM by MOONDOGNYC »
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1977 CB750F

Offline tweakin

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Re: 1977 cb750f2 (915cc)
« Reply #845 on: June 01, 2013, 03:09:36 PM »
Got out on the bikes today with brandEn and made a little video while experimenting with the GoPro.  Need to get a solid back housing to cut down the wind noise for sure.
Bike is running very well, super strong.  During the second clip hit 115mph quick and easy and still had a ton to give.  Thanks again to Mike Rieck for the head work and over all guidance with this engine build.  Love the sound of the RS34 rattle. ;D


http://youtu.be/xi7gs_b62cY
« Last Edit: June 01, 2013, 03:14:47 PM by tweakin »
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Offline MOONDOGNYC

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Re: 1977 cb750f2 (915cc)
« Reply #846 on: June 01, 2013, 06:35:11 PM »
I'm guessing "no shots" ?   :(
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1977 CB750F

Offline tweakin

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Re: 1977 cb750f2 (915cc)
« Reply #847 on: June 01, 2013, 09:00:28 PM »
Sorry man, life got in the way.  Here are some shots that I hope will help with your upholstery.   The seat is riveted to the seat pan underneath.





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Offline MOONDOGNYC

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Re: 1977 cb750f2 (915cc)
« Reply #848 on: June 02, 2013, 03:48:27 AM »
thank you...
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1977 CB750F

Offline tweakin

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Re: 1977 cb750f2 (915cc)
« Reply #849 on: June 04, 2013, 07:53:28 AM »
Quote from: MOONDOGNYC on June 02, 2013, 03:48:27 AM
thank you...
you bet, sorry it took so long.
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