Engine misfire

[peterengland]

550 seems to be msfiring at lowish revs in 1st and 2nd when pulling away slowish, once opened up in higher gears all trace of the miss disappears totally. New plugs and points fitted and timing done statically. Please someone tell me its not the carbs...(46A) not tried new leads or caps.

[Nurse Julie]

Just a thought. If you gave fitted new plugs, just make sure they are not the resisted ones.

[peterengland]

no they are D8EA , fitted them because of the miss

[Bryanj]

Sorry mate if its PD type, clean the pilots again!!!

[peterengland]

oh god, carbs off then. Where are the pilots exactly?, not sure not disassembled them before.

[Bryanj]

Inside the float bowls and they are pressed in not sçrewed in. You need to grip with vice grips and pull and turn at same time, to refit tap with soft metal small hammer

[peterengland]

Thanks fr that, god I hate taking the carbs off, 30 mins to get off and 3 hours putting them back   (if I do it quickly!)

[K2-K6]

Get everything warm to work on them as it'll give you an easier time with non metal bits. 

[paulbaker1954]

Thanks fr that, god I hate taking the carbs off, 30 mins to get off and 3 hours putting them back   (if I do it quickly!)

On my 500 I can get them off and back on in 15 minutes.

I push the rubbers between the carbs and airbox back in to the airbox. The two inners I actually push all the way back  so they are off and inside the airbox and the two outers not quite off. This gives enough clearance to easily pull the carbs out.

May be different on the 550 but just thought I'd share my tip.

Yes a bit fiddly to pull them back through but not too bad and I have even found now I can do it with the airbox still bolted up. Admittedly my rubbers are newish and pretty pliable.

Don't get me started on carbs though They are the bane of my life mine have been off an d on more times than I can remember

[peterengland]

is there a diagram of the 46A's anywhere?

[Rob62]

Have you tried new condensers before tackling the carbs? Are you sure th inlet stubbs are fully sealed? Worth checking first

[peterengland]

not tried condensers, if it were them would it not affect it at all revs and not just at low?

[Rob62]

Never rule out simple solutions, always try the simple stuff first before tackling the bigger / more expensive jobs..

[peterengland]

true

[Ashdowner]

Don't worry Peterengland.. With PD46 carbs you'll get plenty of practice at pulling and dismantling and putting them back and those times you quote will soon come down. I've just taken less than an hour to put mine in and everything back together. There are little tricks you learn on how to make it easier. 
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