SOHC.co.uk Forums > CB350/400

My 400/4

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hondatri:
  My 77 400/4 is running rich and plugs fail after a while I am going to remove Carbs (God help me) to clean and adjust them, is there a simple way to remove carbs. I have a small sonic cleaner but dont know what liquid to put in it to clean jets. I have the use of a vacuum set for synchronizing. Also the Timing chain is noisy and want to do a job on it at the same time and replace chain/guides/and adjusters can this be done with eng in frame. Any info appreciated.

Bitsa (Ralph Wright - RIP):
Hi,
All of what you have asked for can be done in the frame except changing the cam chain and primary chains.The 400/4 motor is a gem to do nothing hard except the cam chain adjuster a right bastard if seized.In my past the running rich is caused by the rubber rings around the main jets but dont take my word for it there are loads of 400/4 guys on here that are well into them.
Best of luck
Cheers
Bitsa

Piki:
Hello, have you check the ignition system??  Points Gap,  Timing Adjust,  Plug Gap, Check the Coils.............Many times, the problem is from the ignition system......

hondatri:
 Thanks Guys I bought this 400 2 yrs ago and it was never really right thats why I need to rectify things. The previous owner fitted Boyer Branson Electronic Ign. I have a Haynes Manual. I saw somewhere a tip for easily removal of Carburettors but cannot remember where.

Dan:
I had my carbs off recently. Getting them off is simple but putting them back on can be a pain, or rather getting the air box rubbers back onto the carbs can be a pain - if they have age hardened.

Undo fuel hose from tap and remove petrol tank

Undo / remove throttle cables from carbs

Loosen off clamps on the rubbers between carbs and head / carbs and air box

Pull air box back off carbs and remove air box rubbers then pull carbs back from the head rubbers

You should have enough room to get the carbs out to the side now. I leave all petrol lines and overflows connected to the carbs.

I ended up buying new air box rubbers From DS to make refitting easier after using a heat gun previously to soften up the hardened rubbers.

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