Johnny356

Hi, thanks for the replies, I will investigate these things. There is some light marking on the piston but I don't know if that is acceptable - I know it isn't in auto engines and so maybe that is pointing to the problem. It doesn't feel like the saw seized - it would not pull on the starter cord if that was the case? I have already checked spark and that is good. There is no decompression button on the saw. I posted on another forum and concerns were raised about an air leak. So, I have a project on my hands..perhaps not the best purchase I have made..!

Hi, thanks - I set the lever to line up with the top of the carb block like the guy on youtube showed me! I had a reply on another forum suggesting an air leak and so I am going to look into that.

Hi, I have signed into a couple of forums to try and figure this out. Thanks for having me here. So, I have struggled with a reluctant, bad, cheap chainsaw for a few years and so decided to invest in a reluctant, cheap, good chainsaw. So I bought the Jonsered off ebay for £100... we have a family connection to Sweden, so it felt correct, and I hoped it would be a nice, well made old thing that I could keep running as a weekend firewood tool and occasional help clearing our local roads that get blocked every winter it seems. Advertised as running and 'lively', it arrived with a worn bar and chain of course, but nice enough and had decent compression (on the starter cord at least), as well as having the heated handles option. It started and was indeed lively - for around 25 minutes. It then stopped suddenly and would not restart for love nor money. I have: Checked air filter and fuel filters - both clean already. Replaced fuel with fresh UK 95RON fuel, and semi synthetic 2 stroke oil that is about 2 months old at 50:1. Replaced plug. Checked for spark against the case- present, and absent when cut off switch is on. I have removed the muffler and it is not blocked. The piston has light markings but doesn't look too bad. And I have stripped the carb and sprayed it through with carb cleaner and compressed air, and rebuilt with a rebuild kit. It will still not start. It appears to be flooding when I am trying to start it. I don't have easy-start spray but it won't start on carb cleaner. I had a brief start happen a couple of times with full throttle applied, it just revved like crazy and then died. I spoke to a local small engine specialist who immediately said - 'carb - but you might struggle to find one'. He also offered to clean the carb in his ultrasonic cleaner but said it may not help, so I am undecided whether to do that next. There are a couple of rebuilt 2051 carbs for sale on US eBay but they are an unknown quantity and not cheap, so will be almost the price I paid for the saw after shipping and taxes. There are no immediately obvious applicable chinese carbs for this saw. So, my questions are - can anyone suggest anything else I can do to troubleshoot this saw? If not, if I find a chinese carb for a 50cc saw that has the same dimensions (mounting bolts spacing, inlet and outlet diameter) is it worth trying this? I would need to modify throttle linkage I guess. The carb is Walbro and has 21-263 3-4 and HDA 68a on the casing. Thanks for any help, Johnny.