Honda-SOHC

SOHC.co.uk Forums => CB350/400 => Topic started by: Drew400 on January 05, 2015, 07:38:20 PM

Title: Is this what the inlet manifolds should look like?
Post by: Drew400 on January 05, 2015, 07:38:20 PM: Hi all,

And for my first question of 2015...

My 400/4 was owned by a learner and restricted to 25kw (whatever that means!) to which end an inlet device was fitted by I F International. You can see from the photos below that I have removed the offending article from each one. I would be obliged if you experts can confirm if they now look as they should or is there anything else to remove (i.e. the inner lining, say?).

Thank you.

D.
Title: Re: Is this what the inlet manifolds should look like?
Post by: Trigger on January 05, 2015, 07:44:22 PM: yep, Drew these plates need to come out ( unless you don't have a full motorcycle licence ) I would also check the down pipes on the exhaust and i think you have already checked the carbs.
Title: Re: Is this what the inlet manifolds should look like?
Post by: Bitsa (Ralph Wright - RIP) on January 05, 2015, 07:57:41 PM: Christ is that how its done nowadays?
Can you still ride a 650 with a sidecar on a learners licence? Dont know
Cheers
Bitsa
Title: Re: Is this what the inlet manifolds should look like?
Post by: Drew400 on January 05, 2015, 08:55:55 PM: Thanks Chaps.

I have just looked on DSS site to see that what I have left looks OK (and there's clearly a space for a rubber insert in the engine end of the DSS pictures). I guess those engine end rubber seals(?) will need renewing.

Also, the DSS site shows them as pairs (1 & 4 and 2 & 3)... do you know how I tell the difference, as clearly I failed to realise that and to label them accordingly when dismantling? Yet more learning for if ever I attempt this rebuilding malarkey again!

Cheers, D.
Title: Re: Is this what the inlet manifolds should look like?
Post by: Trigger on January 05, 2015, 09:24:58 PM: Drew, You will work it out. There is two holes that go to the head and a small screw (for balance tubes) which face south (down).
Or do they face up on those? UP
Title: Re: Is this what the inlet manifolds should look like?
Post by: Drew400 on January 05, 2015, 10:04:53 PM: Thanks again Trigger.

Cheers, D.
Title: Re: Is this what the inlet manifolds should look like?
Post by: boilermaker1 on January 06, 2015, 05:58:33 PM: small screw (for balance tubes) , Is on the engine casting facing up, not on intake manifolds
Title: Re: Is this what the inlet manifolds should look like?
Post by: Drew400 on January 06, 2015, 06:41:43 PM: They are indeed... my screws are already in place pending fitting of these manifolds. Cheers, D.
Title: Re: Is this what the inlet manifolds should look like?
Post by: tom400f on January 06, 2015, 08:28:19 PM: Drew mine is a late model but the carb rubbers have, er, 1 2 3 4 on them. See pic.

Have you looked closely?
Title: Re: Is this what the inlet manifolds should look like?
Post by: steven400/4 on January 06, 2015, 08:47:42 PM: two rubbers should have one and 3 on and two should have 2 and 4 on the number goes at the top 1 at the top on n/s of engine 2 next to it and so on so on
Title: Re: Is this what the inlet manifolds should look like?
Post by: tom400f on January 06, 2015, 08:53:56 PM: Makes sense. Couldn't get the oculars in that far...
Title: Re: Is this what the inlet manifolds should look like?
Post by: Drew400 on January 06, 2015, 09:00:49 PM: Nice one Tom & Steven,

I'll check them properly next time I'm in the garage... not for a few days, sadly.

Cheers, D.
Title: Re: Is this what the inlet manifolds should look like?
Post by: Drew400 on February 22, 2015, 03:37:01 PM: Hi all,

Finally got around to fitting these and hopefully the carbs, only to be disappointed (what's new?).

One of them broke (i.e. the rubber split in half across the middle) and so I assume they're rather old and that the rubber has hardened. There's evidence of perishing around some of their edges. I have thus bitten the bullet and ordered a set of new ones from DSS.

I'm hoping that the new ones will be pliable and allow me to push the carbs into them after fastening the rubbers to the block. Is that wishful thinking? There was no way I could put enough pressure on the old ones to do that! Difficult to warm them up in situ and I don't really want to wait for a hot day in summer to do it.

Any hints here much appreciated before next weekend's pleasure and frustration session in the man cave!

Thank you,

D.
Title: Re: Is this what the inlet manifolds should look like?
Post by: Trigger on February 22, 2015, 04:09:19 PM: I was going to say that Cruzinmage do then at about £25 a set.
Title: Re: Is this what the inlet manifolds should look like?
Post by: LesterPiglet on February 22, 2015, 05:27:24 PM: Place the rubbers in hot water for a while before you try assembly.
Title: Re: Is this what the inlet manifolds should look like?
Post by: Drew400 on February 22, 2015, 05:52:08 PM: Thanks Trigger & Les,

I've gone for the non-Honda versions so a little more expensive but not too much so.

I'll warm them up, but wonder how they'll stay warm enough for long enough whilst all being fitted to the block and then fiddling with the carbs.

I'll keep you posted.

Cheers,

D.
Title: Re: Is this what the inlet manifolds should look like?
Post by: Lobo on February 23, 2015, 08:07:15 AM: Also read a hair dryer is a good tip to keep 'em warm; send the missus out for a while...
Title: Re: Is this what the inlet manifolds should look like?
Post by: Drew400 on February 23, 2015, 08:09:47 AM: Will do Lobo! Cheers, D.
Title: Re: Is this what the inlet manifolds should look like?
Post by: Johnwebley on February 23, 2015, 12:24:26 PM: Quote from: Lobo on February 23, 2015, 08:07:15 AM
Also read a hair dryer is a good tip to keep 'em warm; send the missus out for a while...

maybe a heat gun would do as well,
Title: Re: Is this what the inlet manifolds should look like?
Post by: Drew400 on February 23, 2015, 12:54:53 PM: Is that the kind of thing one uses to remove paint from window frames (albeit niot held too close to the rubber, I guess!)?

Ta John,

D.
Title: Re: Is this what the inlet manifolds should look like?
Post by: Bitsa (Ralph Wright - RIP) on February 23, 2015, 08:33:10 PM: If you do Drew would advise no petrol about mate which I am sure you know
Cheers
Bitsa
Title: Re: Is this what the inlet manifolds should look like?
Post by: Drew400 on February 23, 2015, 08:57:19 PM: Nice thinking, Bitsa.

As it happens, there's no petrol anywhere near my bike at present. I'm looking forward (I think) to adding petrol when the carbs are in place... not only to see if it runs, but before that, to see if the petrol stays in there!

Cheers, D.