problem DR350

if the source coil is on the stator, then i've just had that rewound, but made no difference

 

CV carb

Did you actually remove the anti-tamper plug that conceals the idle
mixture screw and squirt carb cleaner from an aerosol can through the
hole the idle mixture screw goes into? Some of those idle mixture
screws are only turned out 1/8 to 1/4 of a turn, so gum and varnish
builds up right there...

And, if you hold your finger over the three outlet ports just
downstream of the throttle butterfly and squirt carb cleaner through
the idle mixture hole where the screw came out of the carb cleaner
still have two ways to go, it can go into the carb float bowl and also
out the idle air passage in the carburetor inlet bell. That's the hole
on the opposite side of the carb from the starting enrichener...

So, if you can hold your finger over the outlet ports and the air inlet
port while spraying into the idle mixture hole, you can probably blow
any crud that's in the idle bypass port through the idle jet and back
into the float bowl...

 

carb

If it's a CV carb, you might want to look at the diaphragm.

Also, does the needle actually move up and down with the piston ?
If it's not clipped correctly and just sitting in its jet instead of
moving with the piston, this would certainly give a bogging effect.

If it idles OK, I would concetrate on the piston and needle jet.