amfell

try Meetens on 01772 691604 Meetens specialising in petrol and diesel engines and spare parts for industrial machinery or Uni-power on 01371 875331 Uni-Power | Briggs | Honda | Kohler | Kubota | Lombardini | Peerless | Tuff Torq | Yanmar

the official service bulletin from Husqvarna re poor idle 550 idle cure.pdf

525 39 68-02 inlet pipe assy 577 40 64-02 hose

part number 506 22 99-12 current price £300.55+Vat

the tool you require is an MTD part number 797-00039 best of luck in finding one I could only find one available in the uk on diyspareparts.com for the reasonable price of £47.78 a search reveals that the sale of the tool was banned by the EPA in the states to stop the unauthorised twiddling of the mixture screws by non service personnel

the windvane is connected to the choke shaft there is a bit of adjustment with putting the spring in different holes on the choke / governor lever the governor system was used mainly on the TS350 to presumably prevent "overspeeding" the abrasive disc the Max engine Rpm is 10,000 acording to the WSM but there is no mention of the theory of operation of the governor

a quick google produced these http://www.rfs.nsw.gov.au/__data/assets/pdf_file/0012/42303/OP-1.3.1-Hazardous-Trees-and-Appropriate-Use-of-Chainsaws.pdf https://public-library.safetyculture.io/products/sem0701-chainsaw-risk-assessment http://www.rapidhire.net.au/wp-content/uploads/2015/03/combined-safety-documents/Chainsaw.pdf

have a look at HLE | Harrison Lubrication Engineering | Oil and Grease Lubrication Systems AKA the nipple shop they also do centralised greasing kits

503 92 53-05 complete crankcase including bearings but no seals or gasket £163.40+vat

straight off husqvarna's price list

the flange is 503 92 85-02 at a price of £2.36 + vat the intake boot is 503 92 87-02 £ 11.02 +vat

Have seen on a 550xp which is basically the same construction the 2 crank fillers have a plastic insert that partially melted and allowed them to rattle against the crank root cause put down to a big-end bearing that nipped and over heated 1 replacement crank assembly later all sorted

from page 32 of user manual 1/4 pitch sprocket A556-001710 20CM guide bar C20H25-52CL-ED 25CM guide bar C25H25-60CL-ET

if you are getting it dipped check if they are using caustic soda (sodium hydroxide) as this will dissolve the aluminium and release dangerous hydrogen gas