hardleydavidson

Ok, so I've fixed the exhaust, cleaned the carb and the jets, reset the air screw and the idle screw, checked the new air filter and I still don't have any power. The bike starts and idles ok, if you open the throttle it will respond all the way to full throttle, however opening the throttle a second time will result in no revs after a quarter throttle and full throttle kills the engine. The bike will pull away but just has no power at all, first is slow, second a joke and third is pointless. Any ideas?

Must admit it sounds a lot beefier with the exhaust hanging off.

Watch it, Northiam isn't that far from me, I might be tempted to park it outside your house, well that is if I could get it to go further than 2 mile without breaking down.

Oh and it's a got a brand new air filter

There's no rev counter so I don't know how many revs it's doing apart from listening to the engine noise. Thanks for the mixture tip that will help no end as I don't really know what I'm doing with it. As for the manual, it's pretty much, "sit on bike, turn bike on, press button you have lots of fun riding, you not fall off" I did manage to get hold of the honda c50 shop manual which is a help as the engine is practically the same.

Plus, Last time I checked the spark it was black which suggests to much fuel.

good tip, thanks. Yeah it's definitely a four stroke. On the subject of main jets, I heard that the pilot jet is for slow speed and is about a quarter of the throttle, if I'm not getting anything from the main jet then that would account for not having anything from about quarter throttle up. Plus it means I would be riding solely on the pilot jet. I did strip the carb when I got it as the bike had been sitting for months and the jets were gummed up. At the moment the main jet is screwed all the way in, do I adjust it but unscrewing it a bit? I've already shortened the pin by one notch??

All I know is that since the bolt fell out the whole thing lurches and splutters along at walking speed. I'm going to try and fit a new bolt in the exhaust manifold this evening. This should solve any back pressure issue if there is one. Next I'll take out the spark plug and check the compression as it's quite possible the piston rings or gaskets might be shot. So far.......... Before the exhaust bolt incident it would start and run ok but very slowly. Pulls away fine in first and gets up to revs but 2nd is slower and third is a crawl. Bike slows and dies on the slightest incline. Only seem to have a quarter throttle and full throttle kills the engine. There is a sweet spot on the throttle but any less or more and I lose power. Yet when stationary the throttle works. Could be coincidence but the only time I lose ignition is during wet weather. Once I've got these bits sorted and been round the whole bike tightening anything loose it should be ok.

Hi, I recently started riding and being very naive, bought myself a second hand chinese 50cc chopper style moped. Now a lot of people say very derogatory things about these chinese bikes, putting them down and saying how rubbish they are. Personally I think they are wrong, these things are far worse than anyone makes out. With a little bit of work I managed to get it through it's MOT but since then the exhaust manifold bolt has fallen out, it won't go up hill at all, there's only about a quarter throttle, the ignition cuts out randomly and I've had to push it home twice. Not to mention the previous owner wiring the positive to the earth which produced some comical lighting issues. Last night it felt like I was pushing a squeeky wheelie bin full of tin cans. The problem I now have is that I'm not flush when it comes to cash so I'm stuck with it and I'm determined to get this thing up to scratch. I am toying with the idea of slowly replacing parts with more reliable ones from a different manufacturer. When it does go, which is rare at the moment, I'm really enjoying riding. I do have one question if anyone knows the answer, if there is little to no back pressure on a 4 stroke will that affect power in higher gears or up hill?