help
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Intermediate
Joined: Sep 2010
Posts: 32
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From: lewisrun pa.
help
ok was riding the bike and all the sudden the rear cyl. drops out under 1/4 throttle. change plugs check timming checked spark changed out gas change oil rebuilt carb, i even cussed it out. read and reread clymer trouble shooting. with all i did it didnt change the problem even a little anyone with any suggestions i would greatly appretaite it at the point of saying f it and putting it in storage until i cn find a shop thats willing to work on a 1985 fxrs 1340. the dam thing only has 22000 original on it and has been freshed in 2000 with about 6000 sense. help
Club Member
Joined: Mar 2009
Posts: 66,114
Likes: 51,403
From: Niles Canyon Ca.
If you still have compression in the rear it's electrical , wires or one hole of the coil died on you if the comp is low or not there check the pushrods see if one tightened up or backed off on you holding a valve open or closed .
Swap the wires between holes on the coil and new wires like suggested before bike that old needs wires trust me . Pull the plugs and hold them against the heads and see if both are sparking when you turn her over
Swap the wires between holes on the coil and new wires like suggested before bike that old needs wires trust me . Pull the plugs and hold them against the heads and see if both are sparking when you turn her over
Thread Starter
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Intermediate
Joined: Sep 2010
Posts: 32
Likes: 0
From: lewisrun pa.
jeeze this sucks
ok ckecked comp 165 both cyl. checked spark good out of both holes switched wires runs a bit smoother but back cyl. still not firring like it should checked pushrods i know if comp is good didnt need to but did anyway seems to be fine ckecked plugs swithed plugs went and got another set to rule them out no change thinking maybe bad cam but i'm stumped so any other ideas? i just moved to north carolina lincolnton area to be exact so dont know any indies or where any shops are. if anyone is in the area i would pay to get this looked at just have no idea where to take it.
Club Member
Joined: Mar 2009
Posts: 66,114
Likes: 51,403
From: Niles Canyon Ca.
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Joined: Jul 2012
Posts: 51
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From: upstate ny
bad lifter? Low oil press ? How does the compression build slow at first then build or fast .Maybe the lifter is not getting proper oil press at low rpm . See how compression builds in each cyl .Im not saying that its not an ignition issue im just saying .
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Club Member
Joined: Mar 2009
Posts: 66,114
Likes: 51,403
From: Niles Canyon Ca.
