Joined
·
3,053 Posts
My sons Green '72 CB 350 has recently decided to start running rough.
Mixed High/Low idle, general lack of response.
Checked - & Re-Checked timing. All Good.
No Points-Condenser to check - Charlie's Place Electronic Ignition.
Valves sound good not over loud normal clicking, same as my Red One.
OK - CARBS - let's take a look see.
Sure enough -Right side has a tear in the diaphragm.
Good - Now we know how to fix things.
BUT ... CHOICES:
JBM - Has replacements that require cutting off the Plastic Retainer Rings on the slide.
It has an extra FAT/Thick Center Section that fills the space where the rings were. - No Alignment Tab.
Looks pretty easy to install.
Diagonal Cutters Snip off the Plastic top/bottom retainer rings.
Stretch new diaphragm into place.
Line up Slide Holes with Carb Body
Drop Slide into Carb - done.
Assume the Fat Center Section has enough friction to prevent slide from rotating.
No alignment Tab so assume friction of top cover prevent any diaphragm rotation.
Once the Plastic Rings are cut off they are gone for good. Good/Bad ?
4into1 - has direct OEM replacement Type diaphragms.
Standard Alignment Tab in the Top Ring.
Lots of Use Caution and Be Careful pressing the new diaphragm into the old slot space between the Plastic Retainer Rings.
So... here's the question.
Anybody here have experience with either or both of these replacement parts?
I've rebuilt plenty of CV Carbs, I've heard about torn diaphragms. I've just been lucky and not had to deal with it until now.
If you have used either one:
What did you like about them
What did you NOT like?
Mixed High/Low idle, general lack of response.
Checked - & Re-Checked timing. All Good.
No Points-Condenser to check - Charlie's Place Electronic Ignition.
Valves sound good not over loud normal clicking, same as my Red One.
OK - CARBS - let's take a look see.
Sure enough -Right side has a tear in the diaphragm.
Good - Now we know how to fix things.
BUT ... CHOICES:
JBM - Has replacements that require cutting off the Plastic Retainer Rings on the slide.
It has an extra FAT/Thick Center Section that fills the space where the rings were. - No Alignment Tab.
Looks pretty easy to install.
Diagonal Cutters Snip off the Plastic top/bottom retainer rings.
Stretch new diaphragm into place.
Line up Slide Holes with Carb Body
Drop Slide into Carb - done.
Assume the Fat Center Section has enough friction to prevent slide from rotating.
No alignment Tab so assume friction of top cover prevent any diaphragm rotation.
Once the Plastic Rings are cut off they are gone for good. Good/Bad ?
4into1 - has direct OEM replacement Type diaphragms.
Standard Alignment Tab in the Top Ring.
Lots of Use Caution and Be Careful pressing the new diaphragm into the old slot space between the Plastic Retainer Rings.
So... here's the question.
Anybody here have experience with either or both of these replacement parts?
I've rebuilt plenty of CV Carbs, I've heard about torn diaphragms. I've just been lucky and not had to deal with it until now.
If you have used either one:
What did you like about them
What did you NOT like?