Help on my Honda

[DJC69WP]

Hi guys/Gals...

I have a Honda CD750F DOHC '82 model...

I was driving with it... going fine, and the next moment It just died... Started it up, and it sounded as if it weren't getting fuel... Not having the time, nor the experience I took it to a local bike shop..

They told me, without hearing it or trying to start it up, that it's my carbs... Fine. they fixed my carbs, apparently the needle&seeds were stuffed so were the floats.

That fixed, they try to start my bike... Noooo it won't start. Took a pressure test and Guess what... Nothing, Zero pressure on 2 pistons, and very little on piston 3 & 4.

They took of my sump and found a lot of metal splints in it (asuming it's my Crank & bearing)
Refusing to open up the engine to tell me whats wrong until I pay them R800 (±$100) for the Carbs.. I told them to F%&# Off.

Any one out there that might tell me where to begin? I would like to fix this myself... I don't have a lot of experience, but I always say, if he can do it, so can I... it's just gonna take me longer...

Regards

Christo
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[finpos]

difficult.

On a bike of that age, no doubt the carbs will be worn to some extent and an overhaul wil have been beneficial. However, you thought you were paying to get you bike running, not for maintainence. So stuff 'em.

In my opinion, it's always unlikey that on a 4-carbed bike the carbs will cause a sudden problem like you describe - simply because you would need all 4 to fail at once, and that's not likely.

As to what could be wrong with your bike, well, anything. The fact you've had such a catastrophic, complete and sudden loss of compression would seem to say:

1. They did the compresion test wrong.
2. Some sort of failure in the valve timing.

It can get very expensive stripping down old engines, and the parts are hard to get.

finpos.

[edd]

It wont be cost effective to pay a shop to fix what sounds like a significant problem on a bike of this age. I have no idea of the costs of used bikes, or garage costs in the USA but certainly in the UK it would probably cost the same amount in purely labour charges as it would to replace your bike.
On the other hand if you fix it yourself you will learn an awful lot and probably be able to fix the bike for not too much cash. eBay usually has all sorts of bits you might need, I wouldnt like to hazard a guess at what has gone in your engine but if you know anyone with a leakdown tester this would be a good place to start. A leakdown test will tell you where you are losing your compression
(leaking air out of the crank breather means its coming past your piston rings, leaking out of your exhaust ports means exhaust valves are not seating etc.) Get yourself a haynes (or similar) manual to work throughas this will help in rebuilding it. Good luck and keep posting if you get stuck
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