SOHC.co.uk Forums > CB350/400

Probably been asked a million times before.......

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paul G:

--- Quote from: Nurse Julie on July 27, 2017, 07:24:03 PM ---It may be worth you talking to Paul Gledhill. He has a DSS exhaust and had a load of trouble getting the bike running right but, I know he did resolve it.......but I don't know how   :-[

--- End quote ---
😬😬 Laverda PM me and I will let you have my mobile number.
It would take ages to do it on the forum.
Mine was the same running weak and would not Rev.
If you have changed the valves and they are not genuine then the 21mm may not be the correct setting. I suppose it depends on the springs in the needle valves.
I also ended up doing the settings with the carbs on their side so the pressure was taken of the valves.
Regards,

Laverda Dave:
OK Paul, I'll PM you tomorrow, I'm sure you'll have the answers  ;). 
I've set the floats with the carbs on their side, letting them soak a bit tonight with some carb cleaner in the drillings just in case.  I'm going to re-check the ignition again in case its slipped (its a brand new Boyer). I'll put the carbs back on tomorrow after I've err....... taken the Morini  :o for its MOT and collected the respoked wheels for the CB250RS rebuild.
Dave

Laverda Dave:
Hi Paul,

I haven't forgotten  :o.  I thought I'd get the carbs back on before I PM you.  I re-assembled them (how many times now...... ::) ) after checking the float heights again, 21mm spot on, I checked them again the next day, still 21mm, they hadn't shrunk overnight and I put them back on.  I rigged up the fuel line and...................they pissed petrol out of three of the overflow pipes  >:(.  At that low point I turned my attention to the CB250RS rebuild.
I've just got home from work and will go into the man cave this evening to take them off again and have another go, I'll PM you when its something positive and I've hidden the box of matches.............

Nurse Julie:
I'm sure you have checked but are all the O rings fitting as they should do?. The reason I ask is that I know someone who had their carbs vapour blasted and because it takes off the surface of the metal, the O rings didn't fit snug any more.

Laverda Dave:
Hi Julie, They all appear to be OK, nothing loose or over tight. All the needles, jets, o-rings and gaskets etc are new Keyster items.
My only concern is the fuel inlet valves, I've seen these with Viton seals in the past and mine are just plain steel. I cant see how these form a good seal against the brass seat without letting fuel by. Looking through a magnifying glass the steel needle tip appears to be rough.  I tried using autosol to lap the two together to make a better seal but the valve sits so far into the brass seat I cant hold it to spin it!
Keyster must have sold enough of these kits in the past so they can't be that bad unless I have a rouge kit?

I've been in the garage this evening, I've put the carbs back on the bike after another check and careful setting up and will try and start it tomorrow morning and see what happens.

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