ranspeed

Thanks for your help guys I popped up to the offroad bike show at Malvern yesterday and bearing your advice in mind I searched out the Amal carb man, he told me that there is a specific main jet for trials bike applications that doesn,t have the small cross drilling. This jet is slightly richer and gives a smoother throttle response, more suitable for trials. He also said that the cam in my bike was particularly sporty and that an even tickover, like a road bike would be practically impossible to get, especially with the open sports exhaust. I pulled the carb as soon as I got home and changed the jet, and also the rubber seal between the carb and the adapter between the head and the carb. I also had a look at the gasket between the head and the adapter, which looked a bit ropey, so i made a new one and changed that as well. The carb man also said I should ride the bike and see what its like. At 6 foot 5 not an easy feat I reset the needle to middle groove and the air screw to two turns out. It ticked over a little better but still a bit lumpy. On riding it up my drive I found that the bike gave plenty of power and went through the gears easily so I may have found a cure / maybe! Alan, the ignition I am using is the new SPL system I bought at the Stafford show in October, it is trials cub specific and the rotor is replaced by the new system and the coil also replaced, doing away completely with the points, but totally reversable if needed. Getting a great spark and easy starting now the carb is adjusted. My next job is to change the gearshift splined shaft. The gear lever is double ended, I suppose to help with trials riding, but the spline is damaged and the lever has been bodged on with a screw. It doesn,t look too difficult and can be done with the engine in the frame. Again, many thanks for your help.....

The bike starts after a bit of persuasion, it hasn't been run since 1982. When it has warmed up, i set it on a fast tickover and the revs rise slightly and then come back to normal every now and then there is a bang from the exhaust or a blow back through the carb. it will rev out and does pop through the exhaust as the revs settle but i supposed that this would be normal. I have fitted an electronic ignition on the standard setting. I recovered the bike as a complete but tatty project and have restored it to a reasonable standard but being 6 ft 5 it is a little small for me to ride far. Most of the cubs on the forum seem to use amal concentric 6/8 00s but i have checked and this is the carb that it was supplied with. It has many unusual parts, the headstock strengthening tube is an oil reservoir which drips down onto the chain via a small bore pipe, (an early scotoiler ?) it is nearing completion and I would like it to run as near as possible to standard Many thanks

Hi Fellas I am new to the forum and am asking for help in setting up my cub. It is all original comerford cub, one of the first 20 shipped to Comerfords. It is fitted with an amal 376/314 carb, I have renewed all jets but can,t get it to run without popping. I have checked all joints and they are airtight. On tick over it surges and pops and all adjustments that i have done have not managed to eradicate these problems. Any ideas, I want to keep the bike as original as possible