http://www.rexcauntracing.com/pages/ig_bultaco.html
try rex caunt
electrex world are a nightmare
wont answer emails
answer the phone then wont ring you back
i have sent three tz race ignitions back
the coils come loose on the stator
http://www.ebay.co.uk/itm/Simoniz-Engine-Enamel-500ml-Spray-In-Matt-Black-/131073272559?pt=UK_Body_Shop_Supplies_Paint&hash=item1e84936aef
used this on my rd350 engine i find it better than pj1
http://www.ebay.co.uk/itm/SLOSH-COMPLETE-APRILLIA-TANK-SEALER-KIT-ETHANOL-RESISTANT-UP-TO-10-GALLON-TANK-/190800735395?pt=UK_Motorcycle_Parts_13&hash=item2c6c9c2ca3
i used this in my fiberglass tank very easy to use
http://www.ebay.co.uk/itm/MONTESA-COTA-247-FRONT-EXHAUST-HEADER-PIPE-21M-/121153516402?pt=UK_Motorcycle_Parts_13&hash=item1c354ff372
i dont have a 247 but it looks like the rubber joint holds the two pipes together
a 2 stroke will smoke when its not been run for a long time
http://www.ebay.co.uk/itm/Montesa-Cota-247-Trials-Front-Exhaust-Rubber-/221271104731?pt=UK_Motorcycle_Parts&hash=item3384c91cdb
is it blowing from this part