Carburation 101

My son's J-Reg 205XL, TU engined, is difficult to start.

When cold it will only ever start by pumping the accelerator, regardless
of choke.

Fuel comes through the fuel pipe fine, so I think the pump and inline
filter are OK.

I assume it is not air or electrical.

So where do I start on looking at the carb, once I have the air filter
off?

Regards

 

Take the top of the carb off and look in the float chamber and make
sure it is about three quarters full of fuel (ish). If yes then
operate the throttle and see if fuel squirts out of the jet in the
venturi part of the carb (where the air goes through). If not then
remove the jets at the bottom of the float chamber and blow out.
There is usually a filter in the "fuel in" connector. Remove and
clean. If it still won't start, have a look at the diaphragm on the
side. Make sure there are no tears in it.
HTH

 

the cold start units on these were notorious for failure, havent done one
for a while since i rarely see 205's nowadays, however the unit is located
on the left hand side of the carb, i recal being able to buy a repair kit
which comes with a new wax plunger (this is the part that wears out) from
main dealer.
its not a difficult job to do and no you dont need to start ripping the carb
to bits, this unit is attached to the outside of the carb and is connected
to the throttle and the choke linkages.
there should be 2 small coolant pipes that run through the unit, the choke
is operated by the coolant temperature..(this is what the wax plunger is
for, when cold is remains closed, and when warm the plunger is pushed out
and opens the choke unit)

hope this helps.......

 

Sorry but these were NOT fitted to 205 TU engines. They were all
manual chokes, before they started fitting injection engines.

 

TVM

I will give it a go