Stupid question - brake light on cluster


Maybe I have more issues than just idle. I haven’t changed anything since last video. I shot this just now. Engine was warmed up. You can hear in the video at about 2 seconds it kinda surges sometimes at idle. Also, later in video I gave it some throttle and seems to miss or backfire. Seems worse than yesterday.

Idle as it is now is below 1000. Maybe 900 or so.

Battery is low maybe 11.98v. Does not seem to charge when running probably cause idle is too low?
 
Set your idle at 11/1200.
These aren't loping hardlys.
I'll add that charging seems to start around 1300. Don't be dismayed.
The 78/79 bs38's are good carbs and if you're running stock exhaust and stock carb air cleaners then the factory jets should be fine.
Points? I'm out on points....
 
Last edited:
Set your idle at 11/1200.
These aren't loping hardlys.
I'll add that charging seems to start around 1300. Don't be dismayed.
The 78/79 bs38's are good carbs and if you're running stock exhaust and stock carb air cleaners then the factory jets should be fine.
Points? I'm out on points....
Can I just adjust the mixture screws or should I also use the dead cylinder adjustment?
 
A simple turning in on the idle/throttle adjustment screw located on the left carb will increase your idle....or decrease it if you turn it out.
The mixture screws on the carb sides have a suggested setting. Stick with that referred to in the manual.
Read the carb manual put together by grizzld1 and 5twins until "your eyes bleed" (I think is the common quote.)
Get those carbs to factory settings first. Get your idle to 11/1200 and see what you have.
Personally I bench set the dual carbs synchronization of the throttle plates using sewing needles, one in each throat, throttle plates holding them down and then adjusting for "grip". What's the thickness of a sewing needle? 1mm? 2 at best? That's not a lot of deviation once you get the same grip on both carbs. Remember- center adjustment screw is for the right carb only, left adjustment screw is for both.
Dead cylinder method? I'm not that anal. Other opinions may differ.
Excuse me now as I have to go outside and yell at some clouds.
 
A simple turning in on the idle/throttle adjustment screw located on the left carb will increase your idle....or decrease it if you turn it out.
The mixture screws on the carb sides have a suggested setting. Stick with that referred to in the manual.
Read the carb manual put together by grizzld1 and 5twins until "your eyes bleed" (I think is the common quote.)
Get those carbs to factory settings first. Get your idle to 11/1200 and see what you have.
Personally I bench set the dual carbs synchronization of the throttle plates using sewing needles, one in each throat, throttle plates holding them down and then adjusting for "grip". What's the thickness of a sewing needle? 1mm? 2 at best? That's not a lot of deviation once you get the same grip on both carbs. Remember- center adjustment screw is for the right carb only, left adjustment screw is for both.
Dead cylinder method? I'm not that anal. Other opinions may differ.
Excuse me now as I have to go outside and yell at some clouds.
Thanks. Downloaded the manual and will do some reading.
 
Another question. I have a couple of 4” Uni air filters I put on the bike. I assume they are not compatible with the original metal air filter housings? Or is there a trick to making them fit that I’m missing?
Thanks!
 
Are you asking about the airboxes or the side covers? You can re cover the OEM filters with foam if they are rotted.
 
Are you asking about the airboxes or the side covers? You can re cover the OEM filters with foam if they are rotted.
I can confirm that. I've done mine, the foam was crumbling to dust. I got new foam the same colour as original. New air filters for a few £. And foam left over for next time.
 
Thanks. I’ll give that a shot.
Just be careful when you are handling the filters removing and replacing the foam. The perforated sheet under the foam has edges like razor wire. If you aren't aware, you could shred your fingers, so be careful with it. Otherwise, it's an easy and well worth doing job.
 
The same foam used on high dollar filters is the same stuff they sell in sheets at the big-box store as AC window unit filters. IMG_1792.jpegIMG_1794.jpeg
 
IMG_6257.jpeg
All the old glue is shot on mine. All 3 pieces apart. I’m going to try to figure out some mechanical means to reassemble the cage. Maybe punch some slots in the end brackets and hold together with zip ties? Glue scares me around gas and oil products. Don’t want stuff going into engine. Any other suggestions welcome.
 
View attachment 262561All the old glue is shot on mine. All 3 pieces apart. I’m going to try to figure out some mechanical means to reassemble the cage. Maybe punch some slots in the end brackets and hold together with zip ties? Glue scares me around gas and oil products. Don’t want stuff going into engine. Any other suggestions welcome.
Hmmm. Mine didn't fall apart. Only the foam crumbled to dust.

First thought. Ultrasonic clean the bits. Thick beads of silicone mastic on the ends, press the bits together and leave a couple of days.
 
Arts and crafts was never my strong suit. Also, you would not want me stitching up your wound.

I did use an adhesive to glue the cage back together (gas and oil resistant). I used a high strength fishing line to sew the foam together. Uni filter foam.
 

Attachments

  • IMG_6259.jpeg
    IMG_6259.jpeg
    514.9 KB · Views: 17
  • IMG_6260.jpeg
    IMG_6260.jpeg
    356.9 KB · Views: 18
I think I have an electrical issue. Here’s what I’m dealing with.
I got a new battery. I also brought it to advance auto test. Tested ok

I also tested with another battery

When I turn on the key voltage drops about .8 volts at the battery. So if I start at 12.4 it drops to 11,5 or so.

Idle at 1200 and battery stays at around 11.6.

Rev to 2000 and voltage might get to 12v.

I checked resistance across main fuse and it is 0 (not started, key on)
I pulled other fuses and voltage does no go back up.
Turn key off and voltage goes back up

The idle is erratic and I wonder if it could be due to low voltage? Idles ok then will surge a bit then back down.

I’m looking at wiring diagram trying to figure out where to start.

Thanks for your help!
 
Back
Top