Author Topic: Carb fuel height follow up  (Read 465 times)

Offline muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 11032
  • Karma: 132
  • Lithgow NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Carb fuel height follow up
« on: 06.06. 2024 20:25 »
G'day Fellas.
A few little problems. Both carbs set exactly the same and balanced. Left side blowing black smoke so it's rich. Lowered the fuel height a bit more but no better. Discovered the choke (enricher) sticking open or little rubber seal at the end of the plunger not sealing. A few years ago I changed from push/pull knobs to cable to the handlebars. Put knobs back in, all good. Reset the fuel height.
By now the carbs have been on and off at least half a dozen times. Now the right sounds a little off. Start her up again first kick and warm her up. Out with the can of WD and spray all the joints. Yep air leak at carb to manifold joint (by now I feel like a joint  *whistle* *grins*). Off with it again and the O ring came off in 3 pieces. No replacements in the box of bits so out with the gasket paper. Now waiting for the RTV silicon to set. Try again tonight.
Good job the weather has turned to poo and it's Kings Birthday long weekend. Used to be cracker night till the snowflakes got in!
Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7

Online berger

  • Wise & Enlightened
  • *
  • Join Date: Nov 2017
  • Posts: 3207
  • Karma: 22
  • keith.uk 500sscafe.norbsa JDM honda 750fz
Re: Carb fuel height follow up
« Reply #1 on: 06.06. 2024 23:03 »
musky i think you need a good bud --ey at times like this ,

Online olev

  • Brisbane, Australia
  • Resident Legend
  • *****
  • Join Date: Sep 2008
  • Posts: 645
  • Karma: 5
Re: Carb fuel height follow up
« Reply #2 on: 07.06. 2024 00:58 »
Can someone tell me why two carbys are better than one?
I'd have a triumph tr6r over a bonneville any day.
cheers

Offline muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 11032
  • Karma: 132
  • Lithgow NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: Carb fuel height follow up
« Reply #3 on: 07.06. 2024 08:28 »
G'day Olev.
2 cylinders, 2 carbs, 2 ex pipes. So if there's a discrepancy with 1 cyl over another it can be tuned out. My rHonda has 4 different pilot settings and 2 different plugs. And because the Cafe motor is the old race motor. I had a SR head to go on but it melted  *sad*
Then there's induction bias, some do some don't.
I'll be pulling out the colour tune over the weekend.
Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7

Offline Rex

  • Wise & Enlightened
  • *
  • Join Date: Apr 2017
  • Posts: 1701
  • Karma: 8
Re: Carb fuel height follow up
« Reply #4 on: 07.06. 2024 12:38 »
Do Colortune's even work with modern juice?
Some say yes and some say no.

Online limeyrob

  • Resident Legend
  • *****
  • Join Date: Nov 2023
  • Posts: 906
  • Karma: 4
Re: Carb fuel height follow up
« Reply #5 on: 07.06. 2024 13:01 »
Good point, and I don't know the answer.  A friend of mine was involved in the Buncefield disaster - 20 tons of unleaded went up in one go.  One of the issues that surprised them was the force of the explosion, it was several times bigger than predicted.  It seems that the predictions were based on leaded and unleaded burns much faster and so you get a bigger over pressure.
Slough 59 GF/SR

Online Triton Thrasher

  • Scotland
  • Wise & Enlightened
  • *
  • Join Date: Feb 2009
  • Posts: 1992
  • Karma: 23
Re: Carb fuel height follow up
« Reply #6 on: 07.06. 2024 14:58 »
Do Colortune's even work with modern juice?
Some say yes and some say no.

You can see the flame and adjust the mixture to make it yellow or blue, so the Colortune works to that extent.

You then find that your perfect blue Colortune mixture doesn’t give you best running and you have to adjust again, without the Colortune.  It was always like that, old petrol or new.

Offline muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 11032
  • Karma: 132
  • Lithgow NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: Carb fuel height follow up
« Reply #7 on: 07.06. 2024 20:42 »
G'day Rex.
My colortune works fine with the non-E 98 fuel and the stuff I boost to 105. I like to set the mixture a little on the rich (yellow) side of blue. I haven't tried it with E10 as it's only 94. Everything I've got, mower, edger, whippersnipper, generator, bikes (except the HD) runs on 105 and a bit of R30 so I can enjoy the smell while I work  *whistle*
Cheers 
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7