Classic Bike Forum

My reaction was the same as Velton's. Before deciding to rebore I would establish just how deep the scratches are (and what might have caused them). If they are only light scratches then I would recommend lightly honing the bores and fitting new rings.

Ian

Ian, sounds very similar - not quite sure what you mean though about swapping the brush connections - any chance you could give me a bit more detail? Many thanks, Andy Hi Andy. When you take the end cover off the dynamo if I remember correctly one of the brushes is connected to one of the two termi...

I had exactly the same problem recently, a dynamo that would motor but not but out a charge. Someone told me to swap over the brush connections at the terminals and hey presto, a healthy charge.

Ian

I can certainly sympathise with you Jimmy, and I'm not genreally one for tearing things down straight away if it doesn't sound too expensive. You could run it for the time being and see how things develope. I pulled my 650 down because I was off on a long trip. On the other hand I ran my Velocette V...

Hi Jimmy. i don't think it should make the slightest difference which pushrods go where. As for the bottom end clatter it could be any number of things - main bearing, cam shaft / follower, timing gears... I had a light clatter from the bottom end of my '71 650 Bonnie just two weeks before I was off...

i've heard it suggested that modern unleaded fuel runs "weaker" than leaded fuel of 20 years ago. If you think your running a bit weak why not fit a slightly larger main jet. By doing so you'll be running cooler, which is never a bad thing. I always err on the rich side with carburetion as I conside...

I don't know BSA unit singles that well, although I had a B40 many moons ago. However I would say that the timing cover should almost certainly have a gasket. Not having one would likey explain the oil leak. Of course it's not uncommon on old bikes that have been pulled apart regularly to find gaske...

Sound the gearing is probably low from the 350. However if anything that would allow the 500 engine to get past 60mph more easily, the 350 probably being geared for about 75-80 flat out. So it would seem that the engine isn't making anything like enough power. Of course with only 500 miles on it it'...

Hi, I've just spotted this thread. If you've got access to welding equipment you can weld a socket onto the plug so that you can get a breaker bar on it.

Ian

hi Biggles. I've read about that before and there are those who use this process to clean the inside of rusty petrol tanks with great sucess. For now I have treated the barrel with a chemical rust convertor, and it looks good. Time will tell how well the finish lasts; But I will bear in mind your su...