Author Topic: Increased ethanol content of gas causes noticeable hardening of rubberized parts  (Read 1392 times)

0 Members and 1 Guest are viewing this topic.

Offline azuredesign

  • Knupping pin
  • Master
  • *****
  • Posts: 1,705
Maybe I'm losing it, and maybe not. I replaced my fuel lines with high quality reinforced material last fall. Today was a good day for us here in central New England as the temp actually wiggled up above 50 slightly. I skipped out on work at 2, and got my cb ready for spring start. I was surprised to find how hardened the lines had become, even though they had been drained, and in a heated garage all winter. At the end of last season, Scott (S-Dog) had noted that my carb intake boots were hard as a rock, which they weren't when I started the bike up after it had been apart for 2 years.

How long are lines and boots going to last now that there's all this alcohol in our fuel? What other parts should I watch out for? Kind of a drag!.

On the bright side, my 35 year old bike started right up. Unfortunately riding it a bit reminded me of all the things I need to do that I'd forgotten about. :o ;D

Offline andy750

  • Really Old Timer ...
  • *******
  • Posts: 7,946
Not sure what kind of cheap fuel lines you are using Ben  ;) but having rebuilt my K4 in a morning this last Sunday when temps were a cool 40s I can share this with you....my stock fuel lines were not hard and I had the easiest time EVER getting my carbs on the engine rubber boots  - I really couldnt believe how easy it was...until I tried the airbox and that was even easier!!! Its had to have taken oh all of 2 mins! Yes literally!

New rubber last year really paid off  ;D

Now...if I could just say the same about my fork gaitors...riding in 30F temps has left them in tatters  :-\

see you soon,
cheers
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline azuredesign

  • Knupping pin
  • Master
  • *****
  • Posts: 1,705
HUH? Well then I am losing it!

Offline MRieck

  • Really Old Timer ...
  • *******
  • Posts: 10,592
  • Big ideas....
 Ben
 Sure its not the acetone you've been sipping. ;) ;D
Owner of the "Million Dollar CB"

Offline BobbyR

  • Really Old Timer ...
  • *******
  • Posts: 12,365
  • Proud Owner of the Babe Thread & Dirty Old Man
Mike R got me a set of boots a couple of years ago and they are still pulsing at idle so I know they are still quite supple. I use a urethane fuel line so that is not an issue with ethanol for me. The carb rubbers may be a different story, I am not sure how wet with fuel they get and if they will be hardened. I think the heat from the motor would be more degrading.
Dedicated to Sgt. Howard Bruckner 1950 - 1969. KIA LONG KHANH.

But we were boys, and boys will be boys, and so they will. To us, everything was dangerous, but what of that? Had we not been made to live forever?

Offline Jerry Rxman Griffin aka MuthaF'er

  • This MuthaF'er is getting to be a
  • Really Old Timer ...
  • *******
  • Posts: 14,937
  • Bought her new 4/75
Ethanol (10%) has been in most pumps I have seen for a LONG time.
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)