air filter q?

right now i have no air filter, or air box. i was just going to use the "bullet" shape filter 1 for each carb. where can i find those? ebay?

 

ebay, but they are not recommended because you will have to re-jet the carbs

 

thats another question i have. i am running open headers, wont i have to rejet anyway? and what jets come in a 550 maxim factory? and which size should i jump up to?

 

theres no real set size that you should put in, it all depends on how restrictive the heads are. how restrictive the pods are, you can get them on ebay. its alot of trail and error. i was going to go that what because to buy a new filter was 40 bucks but the pods were 30 bucks. but the hasle that i will have to go through it more then 10 bucks worth. there is a forum post that has a suggested size for pods and open headers. search that forum and enter "pod filter" as the keyword should be the first or second one just read through there. should help you good luck let me know waht you find maybe ill have a go at it when i get some more money (broke college kid)

 

Here are all the different stock carb specs (carb model numbers, jet sizes, tune-up info, etc.) consolidated into one happy little group of information, so you can print this out easily when you are working on your particular set.


XJ550 Models:

Years & Models: 1981-83 XJ550 Maxim North American models
Carb Manufacturer: Mikuni
Carb Series: BS28
Carb Model ID: 5K500
Main FUEL Jet Size: #112.5
Pilot FUEL Jet Size: #35
Main AIR Jet Size: #70 (non-removable, in carb throat)
Pilot AIR Jet Size: #165
AIR COMPENSATOR Jet Size: not used.
Starter FUEL Jet Size: #35 (non-replacable, in float bowl)
Main jet NEEDLE ID: #4GN
Main needle JET Size: #O-8 (the main needle JET is also known as the "power valve" or "emulsion tube").
Float Height: 21.5mm +/- 0.5mm (0.85" +/- .02")
NOTE: the service data tag says 30mm, but we believe that to be incorrect.
Float Height Measurement Reference Points:
a) at the carb gasket base, without the gasket in place.
b) on the float, at ???? (unknown)
Fuel Level in float bowls: 2mm +/- 1mm (.08" +/- .039")
Ilde RPM's: 1,200 rpms

Although not part of your carbs, your valve clearances should be considered as part of your "intake system", so here are those specs, too. Note that valve clearances should be measured with the engine "cold", meaning 70-degrees Fahrenheit or less:

Valve Clearance Intake: 0.11 - 0.15mm ( = 0.004 - 0.006")
Valve Clearance Exhaust: 0.16 - 0.20mm (= 0.006 - 0.008")

 

Wow. You need to do one of those for each carb type (sorry.) Is the 550 Seca different? 5K5 is Maxim, is there a 4U800 and are they different?

 

i did not relize there were so many jets in one carb chacal. oh boy

 

Hey Fitz, you mean like this?


Years & Models: 1981-83 XJ550 Seca North American models
Carb Manufacturer: Mikuni
Carb Series: BS28
Carb Model ID: 4U800
Main FUEL Jet Size: #112.5
Pilot FUEL Jet Size: #35
Main AIR Jet Size: #70 (non-removable, in carb throat)
Pilot AIR Jet Size: #170
AIR COMPENSATOR Jet Size: not used.
Starter FUEL Jet Size: #35 (non-replacable, in float bowl)
Main jet NEEDLE ID: #4GZ11
Main needle JET Size: #O-8 (the main needle JET is also known as the "power valve" or "emulsion tube").
Float Height: 21.5mm+/- 0.5mm (0.85" +/- .02")
Float Height Measurement Reference Points:
a) at the carb gasket base, without the gasket in place.
b) on the float, at ???? (unknown)
Fuel Level in float bowls: 2mm +/- 1mm (.08" +/- .039")
Ilde RPM's: 1,200 rpms

Although not part of your carbs, your valve clearances should be considered as part of your "intake system", so here are those specs, too. Note that valve clearances should be measured with the engine "cold", meaning 70-degrees Fahrenheit or less:

Valve Clearance Intake: 0.11 - 0.15mm ( = 0.004 - 0.006")
Valve Clearance Exhaust: 0.16 - 0.20mm (= 0.006 - 0.008")



All of these "cheat sheets" for ALL models are listed over at:

http://xjbikes.com/Forums/viewtopic/t=14692.html