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2/7/05 - Pickup
Took delivery of
bike - engine locked up, no turning over at all, difficult to push as brakes
dragging on discs (three of them - dual discs up front, single at rear). 74316 km on the clock. Is definitely a Honda 750, sohc
model, black engine & casings (all badly faded) with an apparently
aftermarket 4 into 1 exhaust, no keys (any key will start it according to the
owner), a torn seat, paint missing and rust on the tank, no clutch or throttle
cables, no sidecover badges, a badly patched hole in the alternator casing,
flat tyres, broken tailight, missing rear indicators - and this is just what
can be seen on the outside...
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On arrival....
3/7/05 to 12/7/05 - Research
CB750F2 Engine
# began from: CB750E 2600014 -
This machines’
engine number is - CB750E 2614968
CB750F2 Frame #
began from: CB750 1000014
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This machines’ frame number is - CB750G 1012524 -From website: hondachopper.com |
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Differences/identifying features - CB750F2 New
cylinder head with bigger valves (34/31mm inlet-exhaust 32/28mm), larger
combustion chamber, larger carb mount rubbers,
stronger cam chain, new camshaft, harder valve springs, new retainers,
cotters, new pistons compression ratio 9/1. New rod big end bolts and
bearings, harder clutch springs, additional fins on crankcase, larger fins on
oil pan, "oil cooler" - finned plate between oil filter case and
engine. Final drive 15/43 or 14/43. |
Have e-mailed
David Silver Spares in the
Hello
Thank you for your
e-mail. This is
a CB750F2 SOHC model, from 1978.It appears to be a "general export"
type. Original colour would have been either R-8C-S Candy Presto Red. PB-7C Candy Sword Blue. NH-1 Black.
You can use the
"CB750F2 SOHC" listing on our shopping cart.
Regards
Tim
Thank You
David Silver Spares
Ltd
PH: +44(0)1728
833020
FAX: +44(0)1728
832197
Visit our site at
www.davidsilverspares.co.uk
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US$1.76 see our currency converter on our website
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----- Original
Message -----
From:
<mrzxp@mrzxp.cjb.net>
To:
<sales@davidsilverspares.co.uk>
Sent: Tuesday, July
26, 2005 10:57 AM
Subject: Model ID
Form
> Below is the
result of your feedback form. It was submitted by
>
(mrzxp@mrzxp.cjb.net) on Tuesday, July 26, 2005 at 09:57:49
>
---------------------------------------------------------------------------
>> Model:
Honda
>> Frame_No:
CB750G - 1012524
>> Engine_No:
CB750E - 2614968
>>
Year_of_manufacture: ?
>> Colour: ?
>>
Country_manufactured_for: ?
>> name: Submit
A possible cause
of "being locked up" is piston(s) stuck to cylinder(s) by rust -
seems bike could have languished for up to 7 years (last WOF expired 08/98)
Previous owner recalls it turning over the last time he tried, although he
cannot recall exactly when that might have been.... a little history......
apparently the previous owner bought the bike off an army guy who had brought
it back here from Singapore, where he used to ride it when stationed there....
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13/7/05
- Dismantling
Removed
carburettors, air filter, exhaust pipe & headers and spark plugs. Sprayed copious amounts of initially WD40 (til it ran out) then CRC
5.56 into cylinders via spark plug holes. Will leave to soak through for
a few days - hopefully will work! Joined the SOHC4 club on
the 'net in anticipation of the need for assistance in the future! http://sohc4.us/
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14/7/05 – Dismantling &
Engine "freeing up"
Decided to remove
oil filter and drain sump of oil - did I say oil? Brownish white sludge would
be more of an apt description! Immediately upon removing the sump plug the
first fluid to appear was a substantial amount of what I assume was all the CRC
& WD40 I have sprayed in! (yellow brown &
thin). This makes me reconsider what could be the likely
cause of the "lock up". If the CRC has made
it past the piston rings to the sump......?
Still cannot turn
the engine over via the kickstart lever...........
15/7/05 – Engine
"freeing up"
Came across a
posting on the SOHC4 site recommending removing the alternator casing and
swinging on the nut on the end of the driveshaft to try turning the motor over…
I removed the cover and decided instead to slide a largish screwdriver through
the stator and to tap on it (the screwdriver) with a hammer… it turned ever so
slightly! Tapped in the opposite direction, and yes, indeed things were moving!
I attached a 19mm socket on the end nut and turned things at least half a turn.
Success! Turned it over a few times and thought I could hear the CRC in the
cylinders sloshing around – went around to the kickstart and hey presto! everything turning over now with that.
17/7/05 - Dismantling
Began dismantling
all peripherals connected to engine in preparation for removal – foot brake
lever, final drive chain (o-ring), wiring from starter motor and alternator.
Also removed front brake calipers to free up front wheel and the rear brake
caliper as well.
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19/7/05 – Brake
removal
Apparently a
common cause of "stuck" brakes is just general rusting of the piston
within the caliper… have now managed to eject the piston(s) from two of them to
begin cleaning them up – the third is proving more of a problem(rear),
will have to try the suggestion from sohc4 forum re using compressed air via
the bleeder screw to "blow" out the stuck piston…
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21/7/05 – Brake removal,
piston(s)
No luck with the
compressed air method – have resorted to using the front brake system to remove
the rear brake piston – after lots of lever pumping, finally! It pops out in a
gush of brake fluid. Continuing to strip the bike of all parts…
23/7/05 – General
Dismantling
Finished removing
all bits & pieces from the frame – wiring loom, headlight assembly,
instruments, ignition switch, coils, rear mudguard, tool box, battery holder
etc…. now ready to pull the engine out… probably next weekend.
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31/7/05 – Engine Removal
Engine
successfully removed today – followed the formula laid out by a contributor to
the SOHC4 forum "Kaceyf2"-
http://glennstauffer.com/smf/index.php?topic=9385.0
which recommends using stacks of
old magazines to "slide" the engine out of the frame… worked rather
well with the help of my long suffering wife!
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Once out, removed
oil pan (sump) and cleaned the oil pump of the old sludgy oil that was in there
as well as cleaned the oil pan – reinstalled.
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1/8/05 – Final Disassembly
Removed rear
wheel, shock absorbers & swingarm – also front wheel, mudguard and forks
from the frame… this now leaves the frame clean & clear in preparation of
paint stripping it and preparing it for painting.
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5/8/05
Posted a question
on the SOHC4 forum last night regarding the oil I discovered in the alternator
cover when I removed it… turns out that this is quite normal as a small amount
of oil is injected onto the starter gears and then finds it’s way down
eventually to the alternator area where there apparently is a drain hole back
into the engine/transmission area.
6 - 13/8/05 – Stripping frame
of paint
Combination of
paint stripper (Selleys - in a spray can) and wire brush on the drill…
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After paint stripping
21/8/05 – Frame painting
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28/8/05 – Begin Re-assembly
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Items re-installed
- steering, centrestand & sidestand, inner rear fender, swingarm, alloy
brackets for footpegs…..Purchased new fork covers as old items were
broken/severely rusted - new ones came from Econohonda in Te Aroha - totally
different items from the original, they seem to be for a "K" model...
no matter, they fit (with a home made spacer to allow for their shorter length)
and they look the part.
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Existing fork cover |
New fork cover |
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Began searching
for a replacement alternator cover as the existing item is in rather poor
condition…
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Existing alternator cover |
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Came across a
website http://www.mypages.co.nz/~andyf/Honda.htm
where the
author had a couple of spare covers… e-mailed him and he has generously donated
one to me… thanks Andy!
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13/9/05 – "New"
alternator cover
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After some hours of sanding with sandpaper –
all scratches gone from "face" – will JB Weld the largish ‘scratches’
at the bottom along with the dent on the front… then more sandpapering…
18/9/05
-28/12/05 – cleaning and more cleaning!
Painted/polished
headlight shell, front mudguard, rear mudguard, glued broken taillight, disassembled
speedo to repair dents in casing, generally cleaned everything that can be
cleaned (front & rear wheels, drive sprocket, chain guard etc, etc) and
began re-assembly to this stage:
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Instruments after painting…
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And... instruments
installed…
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Engine with old paint "mostly removed" readying
it for final painting…
Next
stage – installation of battery box & wiring loom, connecting of all
electrical components (except those reliant on the engine being installed of
course!)
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Wiring connections
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Things are shaping up… Wiring is now completed, just need new front indicators…
26/12/05 – A
Xmas present from eldest daughter…
This is the state
of the tank as received…
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And this is
how it should look – photo courtesy of a website on the internet…
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And this is how it
looks now… I’m rapt! Thanks
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Sidecovers and
"ducktail" have been painted too…
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And now.... all
the bits that have been fixed/repaired etc are now together....
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22/1/06
- Engine painting
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A good result! We'll have to see if it lasts once
the engine gets hot or when I first spill petrol on it!
30/1/06
Engine now back
where it belongs.... in the frame!
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22/2/06
Header pipes -
before spray painting with aluminium heat paint (just to mask the rusty bits!)
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Seat is now
repaired, and along with polished up headers and muffler, things are starting
to look a bit more complete...
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Now, onto the
carbs!!
6/3/06
- Carburettor(s) disassembly/cleaning
Thought I would
just re-install the carbs in the (vain) hope that they would be alright - well,
I should have known... once they were back on the bike, figured I had better
introduce them to some petrol... imagine if you will the image of a colander
into which you have just poured a bucket of water... there was petrol escaping
from what seemed like everywhere - mainly carbs 2 & 3, around the float
bowls, out the overflow tubes, just about everywhere!
11/3/06 - Have
taken the float bowls off each carb and cleaned them - checked operation of the
floats, blew air through all orifices - reassembled - hopefully will do the
trick....
12/3/06 - Hooked
up some petrol to the carbs and.... no leaks!
19/3/06 -
Re-installed the carbs to the bike, hooked up the choke cable and pulled it on
to full choke thinking that the choke butterfly's being closed would stop any
junk finding its way into the engine via the carbs - then just thought I'd stab
the starter button to turn the motor over (been doing that a couple of times a
week) and I must have unknowingly reset the kill switch to the ON position at
some stage during the week because....... THE BIKE STARTED.....
and what a racket! Turned it off straight away! Seems
I'd installed the exhaust collars (collets?) the wrong way round - remedied
that, hooked up some more petrol and hit the button again.... It runs! I let it
go for a bit, it was running quite ragged (this to be expected) and number 4
header pipe was quite a bit cooler to the touch than the others - so turned it
off and unscrewed the float bowl drain screw for No 4 carb - petrol flowed -
started the bike again and observed a slight improvement, although No 4 still
cooler than the others... checked spark and all is well in that
department...guess the carbs are coming off again - that No 4 carb needs some
more attention...
22/3/06 – More carburettor disassembly/cleaning
Concentrated upon No
4 carb, paying special attention to all jets – ensuring all is clean etc.
Re-installed carbs (utilising a length of 4x2 to help lever them on) and
swilled the tank out with petrol before installing the airbox and then the tank
itself – poured in some petrol, turned on the gas tap, full choke, then the
ignition, hit the starter for maybe half a second and –just like that- it
started…. No 4 header pipe heating up nicely with the others now… great! Still
idling rough, but nevertheless all this effort has NOT been for nothing!