Hello Everyone

[Johnny4428]

Consensus on here is to always use original brassware unless you are changing jetting.

[Johny Boy]

Consensus on here is to always use original brassware unless you are changing jetting.

Thanks Johnny, I am hoping to, not taken them apart yet, the barrels do look to have some wear on them, do you think they are OK to re-use?

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[McCabe-Thiele (Ted)]

Thanks everyone, I have emailed Philpots with pictures, I have heard that putting electronic ignition on can help with the flat spot issues? Something I am planning on doing as points always seem to cause issues on old motors

I have electronic ignition on mine! Still flat spot!

That is disapointing, still it will be a few months before mine is on the road, given the carbs a good degreasing and planning on putting all the parts through an ultrasonic tank before I re-assemble.

You might need to poke some jets out with a wire after an Ultrasound bath then give them some more Ultrasound depending on the level of dirt.

[Oddjob]

Those don't look like PD carbs to me, more like 069A carbs off a 550 for instance.

Do they have a choke lever on number 1 carb? the PD carbs have a cable operated choke.

[Johny Boy]

Hi, it is a 550 and yes lever choke

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[Bryanj]

Those are 550F carbs(or 500), have you the blanking screws for vacuum tackoff point on the manifolds that bolt to head?
The carbs you have are way easier to work with by the way

[Johny Boy]

Hi Bryan. not exactly sure what you mean, picture below is the of the manifolds

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[Trigger]

Welcome to the Mad world of the SOHC.  Looks like you have the wrong manifolds fitted for those carbs 

[Trigger]

You need this type of inlet manifolds for the carbs you have .



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[Johny Boy]

Thanks Trigger, now the vacuum take off comment above makes sense, I'll have to add a new set of manifolds to the ever growing shopping list....
Still at least the Carbs will hopefully be less hassle than the PD ones! Small wins

[Trigger]

To use that type of carbs, you will also need the correct air box to carb rubbers. Your choke lever is bent and will need a little straightening up 

[Bryanj]

And 500 or 550 EXCEPT K3 manifolds will do and the rubbers for your carbs to airbox are available pattern

[Oddjob]

Look at number 4 carb, on the flange where the carb bolts to the bracket see if you can read and post the numbers etc stamped into the alloy.

I knew the carbs were wrong as you said you had a K3 and that has PD carbs which everyone keeps saying are trouble, which TBH they are. However there are at least 4 different variants of those carbs you've pictured so knowing what the numbers are tells us what bike they were originally fitted, the jets etc are different.

The 550F1/2 for instance uses 069A carbs, generally.

The 500 uses the exact same looking carbs but those are normally 627B for the UK, different ones for Europe for instance, 022A if I remember correctly.

I may have a spare pair of carb manifolds lying around with the vac gauge outlet, the K3 had the outlets on the carbs hence why there are none on the manifold.

If it was running before it's likely the previous owner has already changed the airbox to carb rubbers as the K3 type are too long.

[Johny Boy]

Hi Oddjob, soory for the 6month delay in replying, got into the strip down and parked the engine and carbs.
Happy new year to everyone. Got my forks straightenged and rechromed though - Philpotts, super job.

I have looked and they are 069A's - which I have now fully stripped down, could you suggest a good rebuild kit?
I think I am going to have to replace the Thottle Slides as well as they are very worn, you can feel the wear easily with your fingers.
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Also I have managed to snap one of the pilot jets off in the body, wierdly its not the thread that has snapped but the cross drilled tube at the end, I'm guessing it must have been stuck to the body, these were in a right state inside, soft and solidified white gunk everywhere.

Anybody got any bright ideas for getting it out? ive tried banging a straight pick into it, it seems to lock in the bore but won't hold on when pulled.
I have sprayed copious amounts of WD40 and Carb Cleaner in there.
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[AshimotoK0]

Try to find a tap which will run down the bore in it (or drill out very slightly to take a tap either metric or BA) and tap some kind of thread. then put a metal sleeve slightly larger OD over it and screw a tapped bar/screw into it with a washer underneath the head  in case of screw or nut if it's threaded bar you used. Then  try to extract it. You could heat it very slightly with a creme-brulee type gas mini torch but be careful ... that alloy they used does melt quite easily.

Another method it to get a hex Torx type screwdriver bit that is slightly larger diameter than the hole in the tube. Press  into the the stuck tube (ie tap in with a little hammer) and then heat slightly as above and try to twist the bit and pull out the stuck tube.

Another method is to file a piece of bar/screwdriver so that it looks like the tang of a file (i.e square section but slightly tapered) so that when you tap it into the hole in the brass tube the corners bite into the walls of the tube. Again use heat as above.