Rusty Tank ? Fuel is Hygroscopic and Hydrophobic -- rainwater and moisture from the air enter your tank and sink to the bottom, this is the balled up gunk that block your carby pilot jets and rusts your fuel tank out. The GSX750S pop up Katana tanks are notorious for it - Icy northern hemisphere winters are damaging to the fuel in tanks and it’s just as bad in high humidity environments down south.

Fuel Cap rebuild kit- (custom made as Suzuki chose unique sizes)2 x seals supplied- for water ( 54mm x 2.7mm) and for fuel (small one 33.5mm x 3.2mm) - of correct dimensions and hardness (its a thing) - Nitrile (NBR) seals are custom made by a leading seal manufacturer in Australia. 

• 1 x Custom size O - ring 17.8 ID x 2.4mm . It’s not just any old Chinese O-ring seal you find in a kit.

• (O - ring seals the keyway cylinder at the top) + SS washer, circlip, SS Allen head screw, SS flat washer and SS spring washer.

• This Kit suits Suzuki petrol tank lock / cap part number 44200-43410-Key which is a No longer Available part (NLA) and was not serviceable- no gaskets were available from Suzuki.

• INSTRUCTIONS PROVIDED- there's a couple of little things to note when pulling down.

• FOR Models 1984 1985 1986
• 
  
• GSX750 SE GSX750 SF GSX750 SG GSX750 S3 GSX750 S4 pop up Katana 84 85 86 (+ canada special)
• GSX550 ESE EFE ESF ESG  84 85 86 (87 some markets)
• GSX1100 ES ESE ESF ESG
• GSX750 EF EFG 84-88 (check cap looks the same for 86-88)

Gsx750se gsx750sf gsx750s3 gsx750s4 gsx1100es gsx1100ef gsx550ef gsx750ef 

    Its a relatively simple job to replace seals (20 Mins) although it might look tricky- you just require expanding circlip pliers and a lubricant for the metal parts if rusted (Lanolin the best- or Penetrene etc).

 Its also a good opportunity to prep and paint your aluminium cap and lever - degrease it all thoroughly, preferably soaking in a bucket with 'grease and wax remover' and a light scrubbing brush.

 (We recommend single pack epoxy but it has a long drying time) and perhaps have any mismatch keys for the cap /ignition sorted by a locksmith whilst apart.