Author Topic: Planning a rebuild  (Read 630 times)

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Offline BurtonWarpup

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Planning a rebuild
« on: November 06, 2009, 10:21:19 AM »
I'm currently in the planning stages for doing a rebuild of my 750 this winter. I was wondering if anyone has put together a complete guide for a rebuild. I'm going to completely strip the bike and start from scratch and I don't want to miss anything or get delayed because I overlooked something. I've found many helpful posts around the forum, but is there a one stop guide that covers pretty much everything?
Mike
1.5x 1974 CB750K4
2003 Triumph Speedmaster
http://flickr.com/photos/mikepark/

"Now, with a hundred miles on the clock, the rider has nearly forgotten what it means to sit anywhere but on this machine." -Melissa Holbrook Pierson

sbrendtro

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Re: Planning a rebuild
« Reply #1 on: November 06, 2009, 12:11:25 PM »
I don't have a comprehensive guide, but am in the middle of my second rebuild.  Seems that if you take it in pieces, its much easier.  My current rebuild is a frame-off, and I've lost track of where some parts go (oops).  Here's a tick list of what I've done on both:

Degrease engine/frame
Remove all chrome and steel wool/brush, and polish, replace if necessary
Clean/rebuild carbs
Disassemble fork tubes, replace seals (tubes if necessary)
Replace steering bearing with tapered bearing
True front wheel, check/replace bearings and seals
Check front brakes
Fully disassemble/clean/check/lube right and left hand control switch assemblies
Check all wiring connections in headlight bucket, repair if necessary
Replace sealed beam with reflector type headlamp
Reassemble front end, torque everything to specs
Check all wiring connections in rear, repair if necessary
Pull rear wheel, chain, swingarm, replace with new needle bearing swingarm pin
Check rear shocks for leaks, replace if necessary, or just clean and polish chrome
Check chain and sprockets for wear, replace if necessary, or clean in kerosene
Check/replace rear wheel bearings and seals, true wheel
Check/replace rubber cushions inside of rear wheel assembly
Check/replace rear brake pads/shoes and check rotor/drum
Reassemble rear end, tension chain,
Remove all cables, check/lubricate all cables, replace if necessary
If gauges are ugly, disassemble them, clean, paint, give them decals
Check all light bulbs, test for proper operation (indicator, instrument, etc)
Remove and clean coils and spark plug cables, replace with Dyna coils if necessary
Check all spark plug ends for proper resistance
Check/gap/replace all spark plugs, points, and condensors
Use POR-15 kit to clean and coat gas tank (MUCH better than Kreem kits, plus its silver)
Drain oil from engine, remove oil pan, clean out metal shavings from the pan and oil pump screen
remove/replace exhaust, reinstall with new exhaust gaskets
Replace oil filter, put in fresh oil
Adjust/bleed brakes
Double check torque on all bolts

Fill 'er up, and start it up.  Probably will run very rough, s do your best to adjust the carbs.  At this point, I take mine to a local shop that balances the carbs for $35.  Very reasonable.

Bottom line "expect to replace" parts seem to be:
Wheel bearings (front and rear)
Bearing seals (front and rear)
Outer engine seals (kickstart, shifter, drive shaft)
Fork seals/boots
Exhaust gaskets


Offline Old Scrambler

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Re: Planning a rebuild
« Reply #2 on: November 06, 2009, 05:47:15 PM »
When you say rebuild.......do you mean the motor only?

If so, follow the manual and the numerous offers of help on these pages for engine tear-down and assembly.  Add the following..........if your motor and carbs are running and performing OK but getting tired or using oil, clean but do not adjust the carbs and store them in a clean box or bag until you are ready to install.  You won't need exhaust gaskets because your motor has spigots.  If you do a bore and larger pistons, you will likely have a bare set of barrels without paint when they come back from the boring shop. Be prepared to repaint the barrels and head.......an maybe the entire set of cases.  Be sure to get the correct gasket set for your motor.  I would recommend getting the heavy-duty cam chain but check for clearance by 'running the motor on the bench' before you install in the frame.  When you have decided on piston size and type of exhaust, jet the carbs accordingly before installation. I recommend you stay with the stock airbox. 
Dennis in Wisconsin
'64 Triumph Cub & '74 Honda CB750 Bonneville Salt Flats AMA Record Holder (6)
CB750 Classic Bonneville Racer thread - http://forums.sohc4.net/index.php/topic,135473.0.html
'63 CL72 Project(s)
'66 CL77 Red
'67 Triumph T100C
'73 750K3 Owned since New
'77 750F2 Cafe Project
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Offline the technological J

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Re: Planning a rebuild
« Reply #3 on: November 06, 2009, 07:33:34 PM »
70 KO...sold to fund the ST http://forums.sohc4.net/index.php?topic=88800.0(Alpha)
74 Kaw 250 Enduro http://forums.sohc4.net/index.php?topic=124278.0
K4 added to collection! http://forums.sohc4.net/index.php?topic=104784.0
78 750K... http://forums.sohc4.net/index.php?topic=60257.0 (Omega)sold to fund the K4
94 ST1100..Gone
72 750 K2 Stay tuned!

Offline OldSchool_IsCool

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Re: Planning a rebuild
« Reply #4 on: November 06, 2009, 08:24:12 PM »
Step 1 - Buy a second bike now so you don't feel time pressure to slap her back together come April.

Step 2 - Get a digital camera.  You will want to photograph EVERYTHING from EVERY angle as you take it apart.

Step 3 - Buy lots and lots of zip lock baggies, masking tape and felt tip markers.  Bag 'em and Tag 'em!

The awesome folks on this forum will fill in the rest of the steps.
Can I have a motorcycle when I get old enough?
If you take care of it.
What do you have to do?
Lot’s of things. You’ve been watching me.
Will you show me all of them?
Sure.
Is it hard?
Not if you have the right attitudes. It’s having the right attitudes that’s hard.