EDITED title to current status.
----------------------------------
Ok apologies for the lengthy post! I'm having difficulty coaxing any kind of life out of my CB400F. Not a massive surprise as it was last taxed on the road in the mid-90's!
I'm really looking for a bit of guidance on an order of attack...what to check next and in what order, all advice welcome!
Intro thread and background to the bike:
http://www.sohc.co.uk/index.php/topic,7399.msg44632.html#msg44632I understand that there's a ton of things that need checking over before the bike will likely run 'well', but as a starter for ten I was expecting for it at least to attempt to fire up...It's turning over but it's not even trying to splutter into life :/
Status so far:
FUEL SYSTEM:- Carbs were gummed and locked up. Following advice on here I left them in hot water to loosen, then stripped and cleaned them with carb cleaner, including jets etc. Replaced all O-Rings along the way.
- On reassembly the bowls leaked badly. I've bought a rebuild kit (non-genuine) and replaced the Float Valves and pins, but left all the other parts as the OEM ones at the moment. On reassembly (3rd/4th time lucky!) now only one of them leaks.
- Tank cleaned, new petcock, fuel hose, in-line mini filter and some fresh fuel.
- The carbs are roughly synced on the bench, but not balanced properly, just rebuilt as they were. I have not put the airbox or filter back on.
ELECTRICAL:- Checked Continuity across the starter circuit. Clutch switch is duff so I have bypassed it with a jumper in the headlamp for the time being, now cranks on the electric starter perfectly fine.
- Checked continuity of Ground side of Coils and Engine Stop Switch circuit.
- Both Coils input sides appear to have a resistance of ~ 5.2 Ohms. A couple of the HT leads havd kneckered ends so I trimmed them a little and refitted the Caps.
- Battery is new but admittedly undersized as I was planning on relocating it. Its an AGM Fireblade battery, I have it sat on an optimate so it has full charge.
- Brand new spark plugs fitted. All four are getting a visible spark when I crank with teh plugs lying on the head.
My feeling at the moment is that no fuel is getting into the engine, I can't see any fuel on the plugs. However, I've tried cranking it with some easystart into the carbs and not even a splutter.
TO DO:- A 'proper' compression check, adaptor for my compression tester is ordered.
- Check static timing, although I cant see why this would be out.
Other things to check?
- Valve clearances, will this make a difference at this stage of things?
- Pull the carbs, clean again and replace idle jets etc with those from the rebuild kit?
- Anything else to check on the ignition system?
Dave
