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Author Topic: Paddy - '78 CB750 - Version 3.0 Coming Soon!  (Read 53804 times)

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Offline theofam

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Re: Paddy - '78 CB750
« Reply #25 on: November 19, 2010, 05:25:47 pm »
Instead of working on Paddy today, I got out with my dad on a lunch ride.  I told you last week about my dad's cherry 1990 CBR1000F he picked up for $2K.  Here are a few shots.  I got to ride it, and it wails!




Check out how nice the wheels are:


Yep, 20 years old with 3,4xx miles!


He added a battery, valve stem caps and a grip strip to the tank to keep his jacket from scratching it.  Other than that, it was ready to roll!

Offline SOHC Digger

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Re: Paddy - '78 CB750
« Reply #26 on: November 19, 2010, 05:40:47 pm »
I love anything that has evolved from the CB750's!

Offline Stev-o

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Re: Paddy - '78 CB750
« Reply #27 on: November 19, 2010, 06:04:33 pm »
Sorry to hear about the K8. Bet you can find a deal on other.

Sweet CBR, always liked those, never saw a silver one.
'74 "Big Bang" Honda 750K [836].....'71 Honda 750K project.....'76 Honda 550F.....K3 Park Racer.....K5 Fiddy Dolla Special!......CB500 Fiddy Dolla Special too!!............plus plus plus.........

Offline BruceDeuce

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Re: Paddy - '78 CB750
« Reply #28 on: November 19, 2010, 06:52:14 pm »
Very nice CBR!
78 Honda 550 Four (K)
79 XS650 Special
72 Suzuki TS400J Apache
72 Kawasaki G3SS 90
73 Aermacchi X90
86 Honda 450 Rebel restored
03 HD Deuce Screaming Eagle
Yamoto 50cc Quad
06 Loncin 110 Quad
85 LT250EF Quadrunner

Offline Little_Horse

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Re: Paddy - '78 CB750
« Reply #29 on: November 19, 2010, 07:28:35 pm »
man that thing is mint

which makes me wonder... have you guys checked the age of the tires on it to make sure they aren't more than 5 or so yrs old?
"Little Horse Cycles" facebook page: http://www.facebook.com/pages/Little-Horse-Cycles/185809474769493

LHC is my start up cafe racer shop specializing in custom parts, bikes, restoration and recreation

The 500 builds http://forums.sohc4.net/index.php?topic=64250.0

Offline theofam

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Re: Paddy - '78 CB750
« Reply #30 on: November 20, 2010, 08:28:24 am »
Digger/Stev-O, it really is an awesome evolution from the 750s.  Just a real nice bike.

Cornandp, my dad and I discussed the tires last night.  They're original - 20 years old.  So, even though they seem OK, he's not going to ride it again until he gets them replaced.  Thanks for keeping his/my safety in mind!

Offline Little_Horse

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Re: Paddy - '78 CB750
« Reply #31 on: November 20, 2010, 04:58:51 pm »
glad to hear it. It has always been hard for me to throw away tires that have all their tread there still. He won't regret it though and should feel a difference right away in how the bike feels.
"Little Horse Cycles" facebook page: http://www.facebook.com/pages/Little-Horse-Cycles/185809474769493

LHC is my start up cafe racer shop specializing in custom parts, bikes, restoration and recreation

The 500 builds http://forums.sohc4.net/index.php?topic=64250.0

Offline theofam

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Re: Paddy - '78 CB750
« Reply #32 on: February 11, 2011, 01:59:23 pm »
I'm starting to realize why my builds take so long. . . because I'm a friggin' IDIOT!  So, you've undoubtedly read about the restorative properties of a gallon of xylene mixed with 4-8 oz of wintergreen oil then simmered at 200 degrees to restore those old, brittle carb boots?!

So, I got it all set up:




After about 10 minutes, I figured Seamus' carb boots were hard, too, might as well go into the garage and pull them off for this magical concoction to do it's trick.  Then, I heard, "WOOOOOF!"  I looked outside, and saw black smoke billowing across my driveway.  Adios, carb boots!



One humbling call to 911, and these guys dropped by to say "hi":



This forum would be worthless without all the lessons we learn from one another.  Here are mine:

  • If you're going to do this xylene/wintergreen oil thang, be REAL careful about the heat you apply.  It's flashpoint will sneak up on you.
  • Do it outside and away from the house.
  • I didn't have an MSDS or accurate info on how to put out a xylene fire, so I had to call the fire house.  What did they do? Hit it with a fire extinguisher and out it went.  Now you know!

So, now that you're done wetting yourself with laughter over my stupidity, who wants to sell me a set of 78K carb boots?

Offline SOHC Digger

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Re: Paddy - '78 CB750
« Reply #33 on: February 11, 2011, 08:19:47 pm »
THAT SUCKS!!!  I've had decent luck with the mixture WITHOUT adding heat.  Sorry about your boots.

Online knowsnothing

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Re: Paddy - '78 CB750
« Reply #34 on: February 12, 2011, 06:52:41 am »
Yikes that sucks, sorry man.  I work with xylene on a daily basis and it is nasty stuff.  I think it was water/wintergreen boil, xylene/wintergreen soak....
1978 CB750k TBD - getting closer, 811 engine
1978 CB750k Blue - around town beater
1974 CB375F Faded Black - had to have that 6th gear
1976 CB400F Red - in many pieces
1973 CB350F TBD - in many pieces

Offline Stev-o

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Re: Paddy - '78 CB750
« Reply #35 on: February 12, 2011, 07:45:04 am »
Reminds me of the stories I've heard of the deep fried turkeys!
'74 "Big Bang" Honda 750K [836].....'71 Honda 750K project.....'76 Honda 550F.....K3 Park Racer.....K5 Fiddy Dolla Special!......CB500 Fiddy Dolla Special too!!............plus plus plus.........

Offline theofam

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Re: Paddy - '78 CB750
« Reply #36 on: February 12, 2011, 09:51:21 am »
Yep, but I'm the turkey!  After my heartbeat dropped below 100 and my magic brew cooled, it looks like the carb-to-intake boots might be salvageable!  The carb-to-air cleaner boots, however, well, you be the judge:



I bought an air cleaner with boots from one of you a few months ago, so I may be back in business! ;D

Offline jaguar

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Re: Paddy - '78 CB750
« Reply #37 on: February 12, 2011, 10:05:13 am »
love the CBRF
my friend as a cbr600f and ive been trying to get it for years.

i really would love a nice clean example of these bikes

Offline theofam

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Re: Paddy - '78 CB750
« Reply #38 on: February 12, 2011, 08:45:07 pm »
Jaguar, the CBR is super sweet. My dad may be selling it.  If he decides to, I'll let you know. It's only got about 3,600 miles on it now. I can't believe how pristine it is for a 21 year old scoot. You simply wouldn't be able to scape the grin off your face if you bought it.

Offline Stev-o

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Re: Paddy - '78 CB750
« Reply #39 on: February 12, 2011, 09:16:09 pm »
Why's he selling, he just got it a few mos ago, right?
'74 "Big Bang" Honda 750K [836].....'71 Honda 750K project.....'76 Honda 550F.....K3 Park Racer.....K5 Fiddy Dolla Special!......CB500 Fiddy Dolla Special too!!............plus plus plus.........

Offline Little_Horse

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Re: Paddy - '78 CB750
« Reply #40 on: February 12, 2011, 09:41:20 pm »
Having experienced spontaneous combustion first hand as well... you should be grateful it was outside and contained. I was not so lucky but unlike you I actually got to use the fire extinguisher  ;D.
"Little Horse Cycles" facebook page: http://www.facebook.com/pages/Little-Horse-Cycles/185809474769493

LHC is my start up cafe racer shop specializing in custom parts, bikes, restoration and recreation

The 500 builds http://forums.sohc4.net/index.php?topic=64250.0

Offline theofam

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Re: Paddy - '78 CB750
« Reply #41 on: February 13, 2011, 04:30:47 pm »
Stev-O, he did buy the CBRF a few months ago, but last month he and I bought R1200GSs to do a bucket-list ride to Prudhoe Bay, Alaska. So, it's simply a matter of floorspace in his garage. No issues with the bike, whatsoever.

Little Horse, glad you didn't do any damage during your combustible event!  Someone was kind enough to point out I misread the wintergreen oil thread. You only add heat if mixing water with the wintergreen oil. Otherwise, xylene and wintergreen oil mixed at room temp. I reread the thread and can't believe what a stupid mistake I made! 

Offline Stev-o

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Re: Paddy - '78 CB750
« Reply #42 on: February 13, 2011, 04:41:33 pm »
Stev-O, he did buy the CBRF a few months ago, but last month he and I bought R1200GSs to do a bucket-list ride to Prudhoe Bay, Alaska.

Sounds awesome, this year?
'74 "Big Bang" Honda 750K [836].....'71 Honda 750K project.....'76 Honda 550F.....K3 Park Racer.....K5 Fiddy Dolla Special!......CB500 Fiddy Dolla Special too!!............plus plus plus.........

Offline theofam

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Re: Paddy - '78 CB750
« Reply #43 on: February 13, 2011, 04:58:20 pm »
Stev-O, Alaska is a six-week trip in 2012.  This summer is a two-week trip from Denver to San Diego then mile marker 1 - finish of the Pacific Coast Highway.  Then, up the Oregon coast to Astoria and back across Oregon, Idaho, Utah and Colorado.  We'll use the two-week trip to make sure we have what we need on the bikes for a long trip (as well as what extras are unnecessary), then we'll be better prepared for Alaska.

Little Horse, I'm hopeful this July I can buzz through Portland and meet you in person!

Offline Little_Horse

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Re: Paddy - '78 CB750
« Reply #44 on: February 14, 2011, 08:29:35 pm »
Hell yeah, I would really like that a lot, I should be pretty free too so lets make it a reality when the time comes.
"Little Horse Cycles" facebook page: http://www.facebook.com/pages/Little-Horse-Cycles/185809474769493

LHC is my start up cafe racer shop specializing in custom parts, bikes, restoration and recreation

The 500 builds http://forums.sohc4.net/index.php?topic=64250.0

Offline theofam

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Re: Paddy - '78 CB750
« Reply #45 on: March 15, 2011, 03:43:37 pm »
I've rebuilt the front brake caliper and master cylinder.  Just need to bleed the brake, but I'm REALLY struggling with the carb/airbox reassembly.  HELP!  I'm trying to get Paddy running when IT rolls through Colorado!

Here's the situation.  Cylinder to carb boots seem straight:



Here are the carbs installed on them:


The new airbox boots are all oriented correctly, based on this thread:



Put it all together, compress it toward the front of the bike as much as I can, and this is what I get:



Any ideas?  This is where I ended up two weeks ago, thought it was the airbox boots, so I ordered new ones, and now I'm right back in the same spot.  Any help would be much appreciated!

Offline unitedguitar

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Re: Paddy - '78 CB750
« Reply #46 on: March 15, 2011, 04:25:19 pm »
Maybe the carbs aren't seated into the boots all the way. I had a similar issue and had to wrap a ratchet strap around the front of the frame and inlets of the carbs and ratchet them down til they popped in all the way. Its hard to tell from the angle in the pic though.
Ben Whitener

Offline theofam

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Re: Paddy - '78 CB750
« Reply #47 on: March 15, 2011, 05:06:46 pm »
UnitedGuitar, thanks for the tip!  I flipped my airbox boots 180 degrees, and it seems to have worked:


I may undo it and try your approach, just to make sure.

Tomorrow I plan on cleaning the tank.  I read recently about Acid Magic.  It's a "buffered" muriatic acid that is safe for skin contact but still has (supposedly) rust stripping capabilities of the acid.  Fingers crossed that it works and I can soon get the tank in order.

Here's my list of what's done and what's left to do:

Gap points
Adjust cam chain tensioner
Rebuild front caliper
Rebuild master cylinder

Adjust valves
Drain and change oil
Remove and clean oil pan
Clean tank
Clean petcock
Bodywork on tank
Primer and paint tank and side covers
Dismount old tires
Mount new tires
Replace fork seals
Replace gear shift seal
Replace chain and sprockets
Adjust clutch (or install new clutch cable)
Buy Battery
Turn key and pray for no fires!
Sync carbs
Ride 'til my smile falls off


Offline Coyote13

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Re: Paddy - '78 CB750
« Reply #48 on: March 15, 2011, 05:09:33 pm »
Agree with the ratchet strap method....or you could just go to pods  ;D



DOH! Too slow, haha.  Oh well, bike's coming along nicely man!
'78 CB750K.  Throttle ripper.
'71 CB100.  Grocery getter.
'01 XL883.  Panty dropper. Gone but not forgotten.

Offline theofam

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Re: Paddy - '78 CB750
« Reply #49 on: March 15, 2011, 07:34:26 pm »
CoyoteUSP, hopefully I'll have Paddy on the road before the Rally comes through here with IT in early May!  Are you and Katy going to ride in the Rally when it comes through Texas?

I'm going to run pods on Seamus, my 550, but Paddy is staying stock for ease of use/tuning.

Cool to see you're riding a '78.  I'll hit you up for ideas when I've exhausted mine (which never takes long)!


 

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