If you own a TD 33 that is not running correctly, and has the following symptoms: Poor starting / Uneven tickover / Bogging Down / No power when accelerator is depressed. Please focus upon the TK 1 Carburettor. At 14:40, you will see a Brass Primer Valve. Although this video does not show a close-up of this brass primer, you can see that it contains two (2) grooves towards the tip of the primer valve. This brass primer should contain two rubber 'O' rings. The purpose of these rubber 'O' rings is to seal, and to prevent any air from passing around the bore of this primer valve. The TK 1 is in my opinion, a poorly-designed Carburettor, because this brass primer is the #1 cause of poor running. To fix this, you must block-off the hole, and throw away this brass primer valve. I used an aluminium rivet which was a sliding fit down this bore. I first cleaned the bore with acetone (and this rivet too). Add a little super glue, then insert. Please also be careful not to add any superglue to the end of the plug that you insert. If you do this, you will block the Carburettor Main Jet!! I can see that over 800 persons have examined this video, and many would have starting / running problems with their TD 33. I modified my TD 33 in this way, and the machine ran like it was brand-new again! If you do not have an inline Primer in the fuel line - buy one and use instead of the brass primer. I hope this helps, because the Kawasaki is a great model, but the TK1 Carburettor lets it down for this reason.