Honda-SOHC

With the bike on the centre stand, if I pull up on the handlebars the forks make a "clunk" sound as the forks are fully extended.
Do I have a problem with my springs (compressed over time and too short) or is there something else I need to look at?
Thought I'd ask the collective wisdom on here before dismantling the forks. 
Note:  I have not yet checked oil.
TIA
Andy

I wonder what our new North American friend thinks of this conversation?


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Probly straight thru to the keeper (or catcher if he's into baseball) Steve! 

After returning the carbs to the bike and performing a vacuum sync (carbs were very close with the bench sync) this project is now essentially complete!    The bike runs well at all throttle settings and returns to the same 1000rpm idle spot.  At some stage I may contemplate a 4 into 4 exhaust but for the time being I'm happy! 

Sounds like you're on your way with it,  it's great when you can get them sorted and get out for a run.

Your not wrong mate!  When we get back from our "Southern Sojourn" the weather should be just right for a few good rides.
There's a club here in Perth (Vintage and Classic M/C Club) which does weekly rides so I'll be hooking up with them! 

Mate, you can call it what you like, makes no difference to me.  I'm sure most folk on here will recognise that IMS refers to Idle Mixture Screw.  Call it an Elephant if you want, it still does the same thing FFS!

Please stop steering topics sideways with specious comments which add nothing.  Thanks.

Fair enough mate...duly noted! This is the 1st bike restoration for me so I will remain for the foreseeable future on an ever upward learning curve!!    It is loads of fun though! 

Anyway I’ve pulled the carbs again, double-checked the idle ccts for cleanliness, and took a slightly different approach to the bench sync.  Carb throttle valves now completely close off when I back the throttle stop (idle adjust) screw right out.  As others have suggested, I may have initially set my “master” carb throttle valve too high which then gave me the issues.

On a separate note, I checked the static timing and discovered I didn’t read the document that came with the electronic ignition properly!!    So I was a few degrees retarded which would not have helped matters.
All correct now.

I haven’t re-installed the carbs yet as I’m still mulling over some conflicting data from the various Honda manuals.  In Europe it seems that the std needle clip setting is in the 3rd groove from the top, with idle mixture screw 1 ± 1/8.  In the US it’s 4th groove down and  1½ ±½.  In the genuine Honda Shop Manual it states  1±3/8 for the air screw. (No needle groove setting mentioned).  I should mention that the needle settings on the jets I originally pulled were on the 2nd groove down and IMSs were 2½ turns out!!!   And yes, close scrutiny shows the genuine Keihin needles have a slightly different profile to the aftermarket ones.

I realise that with a non-std exhaust the std settings may not be 100% but I should be close.

Stay tuned.....

After cleaning the carbs and replacing the aftermarket jets/needle with Keihin originals, I then bench synced using the method espoused by many (back off the idle screw completely, then set using light gap.)

I selected carb #2 as master and calibrated the Motion Pro sync tool on this carb.  The motor was previously warmed up and was running OK but somewhat "rough".  The idle screw was adjusted out to get near 1000rpm.
Initial indications showed #4 out by quite a bit.  Anyway, after some adjusting across #1,3 and 4 the idle could not be reduced below ~2200rpm (idle screw not contacting the throttle bar).  I did not adjust #2 as it was the master.

As per the 3000 service .....timing, tappets and cam chain adjusts have been specced.

Jet needle is at 4th position from top, air screws at 2 turns out.  (DeltaRider I'm setting this bike up to US specs!  EDIT:  DR knows this! )

What is my next troubleshooting step folks? 

Quote from: AndyH on October 16, 2017, 01:09:24 PM

Thanks Julie!  Not bad for an old fart with no prior restoration skills, even if I do say so meself!! 

Bonza 

Goodonya Julie!