Not quite right

modelman · Post by **modelman** » Sun May 08, 2016 6:01 am

Gentlemen (& ladies)
I've only run the CB77 for 1/2 hour or so since the resto, & have no intention of using it, its running before I let go of the button, no leaks, no smoke, so it can't be THAT far off,

BUT, I ran it round the block, up & down the gears OK, but in top gear, if I open up the throttle, it seems to 'bog-down' there's a sort of induction roar but no go.
If I rev it on the stand, & wind her up, again, a big induction roar, hesitation then it gets past that & wacks right up to around 9000.
ALL new jets fitted, needle on centre notch, do you think I should be looking a timing or needle adjustment??
Also, its 'clattery' upstairs, checked the valve gaps, all at .0004", I seem to remember that in the early 60s, these were very quiet engines.
Again, it starts instantly & ticks over at around 800 rpm or so & picks up fine.

G-Man · Post by **G-Man** » Sun May 08, 2016 6:46 am

Modelman

Did you clean the original jets or use a Keyster kit?

Timing set with strobe light?

G

modelman · Post by **modelman** » Sun May 08, 2016 9:17 am

All new jets-set from e-bay, can't remember what or who though, but the numbers checked out OK with the specs in the manual.
The ignition was only set up via a 12v bulb, never thought about the strobe!

The one I have simply plugs between the plug & the cap, (not the points) will that do??
It strobes OK, so what markings should it flash on?

G-Man · Post by **G-Man** » Sun May 08, 2016 11:44 am

Modelman

Those jets and more likely the needles are often not the correct spec. For the strobe, just hook up and point at the rotor. F mark with the extra set of marks for full advance as the engine speeds up.

Probably the needle, main jet or fully-advanced timing is the problem if it doesn't pick up well.

G

modelman · Post by **modelman** » Sun May 08, 2016 12:35 pm

Well, advancing & retarding the timing didn't seem to make much difference, so I think I'll invest in another set of jet-kits!

G-Man · Post by **G-Man** » Sun May 08, 2016 4:07 pm

Do you have the originals for comparison?

I just picked up a couple of sets from Scrambler Cycle. I think Kevn's kit is more carefully assembled and specc'd.

G

LOUD MOUSE · Post by **LOUD MOUSE** » Sun May 08, 2016 5:53 pm

Nice pic of a DREAM engine. ...........?. ..............lm

G-Man wrote:Modelman

Those jets and more likely the needles are often not the correct spec. For the strobe, just hook up and point at the rotor. F mark with the extra set of marks for full advance as the engine speeds up.

Probably the needle, main jet or fully-advanced timing is the problem if it doesn't pick up well.

G