Topic: will pay for someone to come help me fix my 77 Honda CB 750  (Read 2071 times)

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Offline cliqflip

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Don't know whats wrong with it -

The story behind it is:

Tuning was always bad
got it professional tuned
It lost it tune
I figured it was the jets inside the carbs - so bought replacement carbs
still couldnt get it to ride correct, it would always have flat spots in the throttle
Rode it a while like this
Get on the freeway one day - I lose all power and engine starts smoking


Today - Engine will start - but, it will smoke - have not tried to put it in gear.

Theory: Piston is gone

I will buy parts if you can help me fix it? And also I can pay you or buy you some drinks at a bar, whichever you prefer


Attached is the pic of my baby :(
« Last Edit: 12/18/12 11:42AM by cliqflip »
Vroom

Offline Throttle Chopper

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What color smoke is coming from the exhaust?  If it's black, it could still be a carb issue, if it's blue or gray, your bad piston theory may be warranted...  :13:
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Offline cliqflip

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id say white / blue/grey - its a lot of all of it lol
Vroom

Offline Throttle Chopper

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Sounds like you need a rebuild: the blue/gray smoke is likely worn piston rings, the white smoke may be signs of a leaky head gasket.   :4:
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Offline cliqflip

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It was just rebuilt - only has 3000 miles on it

p.s. there is still definitely a carb issue as well - I never got that part fully fixed
Vroom

Offline Throttle Chopper

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Nice bike by the way!  :43:  Dare I ask, who rebuilt it?
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Offline cliqflip

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The guy who I bought it from.. He was a old school Harley builder who built this bike for himself then, realized he was too old to ride it - So I ended up picking it up off him for dirt cheap
Vroom

Offline Throttle Chopper

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Did he provide receipts or evidence of the engine block getting machined or of the parts used in the rebuild?  You may have gotten less of a deal than you suspect, if he has no proof.  :20:   
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Offline cliqflip

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you might be right actually - he has a TON of receipts for the bike, as far as the rebuild goes - I can safely assume he got everything out of a junkyard

I'm thinking in parts it's going to cost me around $500 to get this running again, is that correct?
Vroom

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It depends on the quality of the rebuild, if he has not taken that engine to be machined, that will easily run $100-$200.  No sense in replacing parts if you have a terrible foundation to start with...  But yeah, $500 sounds about right if you do the work yourself.
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Offline Snapshot

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Tight ride.  I remember wanting one when they were new.

The rings on one piston could have lined up, but that's unlikely.  If the head gasket has failed, it could be pumping oil into one of the cylinders.  It most certainly isn't smoke from antifreeze...  Pulling and looking at the spark plugs will tell you which cylinder has problems.  A compression test wouldn't hurt either.

Is it making any funny noises?

Those carbs are rather simple.  I remember them well.  Where do you live?

J~
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Offline cliqflip

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The carbs are very simple! (Other then the actual tuning)

I live in Yorba Linda - Funny noises? Not that I remember, I haven't started it in a couple months
Vroom

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You might as well buy or borrow a compression tester, a low reading will likely point to bad rings....
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Offline Snapshot

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I agree.  The K&N filters make sorting out the jetting a bit more difficult.  A stock air-box and original jetting would be a good idea.  Some mods just aren't worth the work that getting things right entails.  Jetting is particularly important on an air-cooled machine.

I'd recommend pulling and re-cleaning the carbs before trying to start it again.  Otherwise it will pull whatever crap that might be in the bowls up into the passageways.

I have a compression tester.

I'll shoot you a pm.

J~
« Last Edit: 12/18/12 12:13PM by Snapshot »
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Offline SUPERCHICKEN

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Could be rings, valve guide seals. doesnt sound good tho.

would try compression, see what it is, should be above 100psi to be good and go from there.

chicken 714-401-0785
call if u need any help


its easier to add horse power than it is to lose weight

Offline MotoInked

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This sounds like a can of worms. lol Jeff is the man to help you out. Looks like you're going to have to take the top end apart at the very least. Most of the time, it's something simple, something that has degraded with age. Wishing you quick fix vibes. Good luck Jeff!
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Offline boredfast

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I know the feeling, im trying to sort out a 78 yam sr500 and a 74 cb550. not fun.

Offline cliqflip

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thanks everyone for the fast replies - I think threads like this really show why this forum is such a good place to be.

I'm going to be working with Jeff on the bike and I will keep everyone informed on whats going on :) Thanks again
Vroom

Offline mamono

Nice bike, hope you get it all sorted out.

Offline H-2 Charlie

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