Welcome, Guest
Username: Password: Remember me
16 Dec 2020
The Joomla and Kunena packages have been updated to the latest versions.
Forum for GFR

TOPIC:

Re: Carburator issues 6 years 4 weeks ago #4572

  • ivor
  • ivor's Avatar
  • Offline
  • Premium Member
  • Premium Member
  • Posts: 157
  • Thank you received: 2
The 'old' way to de-coke a two stroke exhaust was with caustic soda, though not sure if that's still available. I DO remember many years ago a couple of friends who were two stroke fans reckoned the best way to unblock an exhaust of a bike that had been running rich, was to find the steepest longest hill, and ride the bike down as fast as possible, throttle wide open and engine screaming. Apparently that did work. However, if you blow your motor up trying that, neither I or the Gilera Network can be held responsible !! :laugh:

Please Log in or Create an account to join the conversation.

Re: Carburator issues 6 years 4 weeks ago #4573

  • 72degrees
  • 72degrees's Avatar
  • Offline
  • Administrator
  • Administrator
  • So many menus and buttons - so little time
  • Posts: 761
  • Thank you received: 14
Most of the two-strokes I've worked on lately require the silencer to be repacked at regular intervals.

The GFR one seems sealed for life. Not even pop rivets to drill out and replace to get it apart as far as I can see.

There might be a build up of carbon in the expansion chamber and caustic soda (in some drain cleaner products) is supposed to work. Another option is to burn it out but I don't think I'd want to try this with a rare GFR exhaust. Particularly as re-packing could be a problem.



As to carbon on the piston crown and combustion chamber a "dealer's decoke" is the only option.
"Do not adjust your mind, there is a fault in the reality"
1957 175 Sport

Please Log in or Create an account to join the conversation.

Last edit: by 72degrees.

Re: Carburator issues 6 years 4 weeks ago #4574

  • noreal
  • noreal's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 17
  • Thank you received: 0
Hi Thanks for the replies , I know the piston side is good as I had it replated and new piston recently , as you say the silencer is sealed , I will try the caustic soda approach over the next few days , things are looking good the bike is almost back to how it should be after a long lay up , hopefully this will be the final fix to allow me to use it again.
thanks again for all the advice
Neil

Please Log in or Create an account to join the conversation.

Re: Carburator issues 6 years 3 weeks ago #4575

  • noreal
  • noreal's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 17
  • Thank you received: 0
Hi Again , sorry to pester you but I have a question to ask with regards to ohms readings from the magneto , I disconnected the 3 pin connecter going to the magneto 2 yellow and 1 white wire and measured ohms down the line to the magneto
white to earth 1.5 ohms
yellow to yellow 0.5 ohms
these readings seem low but ive no reference can you help.
thanks again

Please Log in or Create an account to join the conversation.

Re: Carburator issues 6 years 3 weeks ago #4576

  • 72degrees
  • 72degrees's Avatar
  • Offline
  • Administrator
  • Administrator
  • So many menus and buttons - so little time
  • Posts: 761
  • Thank you received: 14
They sound low, but it's been ages since I had the ignition winding go on mine. I'll try and get to one of mine to do some resistance tests but I have to move a couple of bikes to get to a GFR so it won't be until next week (off to a hill climb this weekend).
"Do not adjust your mind, there is a fault in the reality"
1957 175 Sport

Please Log in or Create an account to join the conversation.

Re: Carburator issues 6 years 3 weeks ago #4577

  • noreal
  • noreal's Avatar Topic Author
  • Offline
  • New Member
  • New Member
  • Posts: 17
  • Thank you received: 0
thanks again some readings to compare would be great.
enjoy the hill climb and no rush with readings as im back offshore next week .

Please Log in or Create an account to join the conversation.

Time to create page: 0.068 seconds
Powered by Kunena Forum