CARB ; FLOATBOWL " O" RING RENEWAL
{ FAULT }
Restricted flow from the wee plastic fuel feed pipe from the carb floatbowl to the mainjet
{ SOLUTION }
Check the pipe for kinking / flattening ;
Check the end of the pipe where it disappears into the bottom of the floatbowl .
There is a Seal shaped like a sharp edged ” O “ ring in there which sometimes blocks the tube .
For simplicity I will just call it a Seal in the following
If it is not leaking at the brass nut at the bottom of the floatbowl then I would leave well enough alone BUT if you feel competent enough or the problem of not enough petrol to the carb is still there then the following might help .
CARB ; FLOATBOWL ; FEEDPIPE SEAL RENEWAL
Remember to have a fire extinguisher handy when working with petrol
BEST TO REMOVE THE CARB so you can see inside the threaded hole in the bottom of the floatbowl .
{ I WOULD NOT RECOMMEND THE FOLLOWING UNLESS YOU ARE COMPETENT AND HAVE A WEE BIT FINESSE / SAVVY ;
You can still inspect it without removing the carb by removing the passenger side access panel and you will see the brass feed nut . Be aware that petrol will drain from the floatbowl when you do the following
ONLY DO ABOVE INSITU ON A STONE COLD ENGINE }
BEST TO REMOVE THE CARB
Gently grip the outside spring and pull back .
Slacken the nut and you will be able to gently pull it out .
Now this is the part where you need to take great care .
GENTLY pull the nylon pipe out of the hole keeping it inline and do not twist or crush the pipe as you will have to buy a very expensive whole unit .
As you can see from the picture there is the nut , a small washer to compress the Seal , and the Seal itself .
PARTS
The Seal ;
The following photo was copied from minispares.com
http://www.minispares.com/product/Classic/Fuel/Carburetors/Spares/AUD2194.aspx
Often the Seal remains inside the hole and has to be dug out with a pin .
Take care not to drop the Seal or the small washer .
Inspect the Seal for cuts or crushing and fit a new Seal .
Check inside the hole for little bits of cut Seal and remove as required .
Assembly is the reversal of extraction ; Gently grip the outside spring and pull back , refit the nut , steel washer and new Seal .
Just set the assembly up as in the last pic by keeping pressure on the nut so that the end of the tube goes into the hole first . This should ensure that the Seal stays on the tube .
Again take extreme care not to twist or crush the nylon pipe .
Tighten the nut but do not over tighten { You can Nip it up a little more if there is a slight leak }
Remember to have a fire extinguisher handy when working with petrol
xxxxxxx