372 reving

[carpenter1]

Was using my husqvarna 372 today, fine to start with, but then when come off the throttle the revs did not drop much. Then stopped the saw as not happy with it. It was a pig to start, but same problem. Ideas please

Thanks 

[billpierce]

Was using my husqvarna 372 today, fine to start with, but then when come off the throttle the revs did not drop much. Then stopped the saw as not happy with it. It was a pig to start, but same problem. Ideas please
Thanks 

Air leak, get it vac/ pressure tested. Mityvac. Is my guess anyways.

[spudulike]

The "pig to start" is a worry, if a saw does this then it needs checking over. Usual start is checking the compression, checking the carb and then doing a vacuum/pressure check if the rest has been OK.

Saws shouldn't suddenly change their idle speed and maximum revs and if they do, it needs sorting ASAP.

[carpenter1]

Thanks, I did stop using it as I was not happy. 

Is it something I can do myself, or is it better to take somewhere?

 

Thanks

[spudulike]

Check the impulse line (rubber hose coming out of top if carb) is still connected both ends and if so, make sure the fuel line is OK - not so easy without a pressure tester but both of these have happened in the past. The impulse line sounds more like your issue and if it is loose, it may be worth fitting a new one.

 

Worth making sure the piston looks OK - you can do this by removing the spark plug and using a very small torch to inspect the bore or just removing the muffler and looking at the piston through the exhaust port.

 

You may be better taking it to someone decent, seeing you are South Devon, a fella named Barrie who owns a company called Gardenkit (and also on this site as Gardenkit) knows his stuff and is a good fella - he is just west of Sidmouth and worth giving him a bell if you are stuck.

[carpenter1]

I looked at it today, took the spark plug out and looked in all super clean. the rubber hose was fine, then noticed the bolt down on the right where the rubber hose goes was loose. So tightened up. All good now 

That must had been one of the bolts holding the block, so leaking air.

 

Thanks all 

[spudulike]

Make sure that they are all cranked down hard but guess you probably have, glad you found the issue.

[arboriculturist]

With issues like this, is it worth cleaning threads and bolt threads with suitable solvent and using loctite to assemble?

[spudulike]

It shouldn't need loctite if the bolt is torqued down well. Some threads get a bit sloppy and if a screw keeps coming loose then Loctite is an answer but you should be OK. Just check in a couple of months time.