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honda cb 450 dx

14 Posts | Latest reply on 02/10/2011 21:49:26 by firebladejohn | Go to original / last post

14 posts found over 1 pages. Displaying over 1 page.

firebladejohn

In: darwen
Posts: 437

has anyone ever had problems with the float settings or fuel levels on the carbs on a cb 450 dx . spark plugs keep sooting up. the floats have no adjustment on them. is this a common problem on the cb hondas late eightys models....... cheers

Message posted by firebladejohn on 12 April 2011 at 02:14

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firebladejohn @ 12/04/2011 02:14:21

Simon66

In: Peterborough
Posts: 846

The length of time this post has been here without reply says it all about this model of bike. I have one which is now knackered and getting any info or a workshop manual is almost impossible. All I can say is that I never had any fuel or carb problems with mine when it was on the road.

Message posted by Simon66 on 27 July 2011 at 01:13

Simon66 @ 27/07/2011 01:13:32

firebladejohn

In: darwen
Posts: 437

hi simon66 did you ever have problems with the ignition system on the dx ie coil , cdi unit , generator . im getting an irratic spark on the bike , have done all the checks . bought new spark plugs .....cheers

Message posted by firebladejohn on 27 July 2011 at 01:51

firebladejohn @ 27/07/2011 01:51:15

Deleted Member

In: NA
Posts: 0

any chance it could be the needle (s) in the carbs? if they're worn and causing slight overfuelling maybe?

Message posted by Deleted Member on 27 July 2011 at 01:56

Deleted Member @ 27/07/2011 01:56:08

wheelbarrow

In: Cardigan
Posts: 750

This might help with getting a manual for it, have a read http://hondacb450dx.blogspot.com/2009/03/how-to-get-wor...50-dx.html

Message posted by wheelbarrow on 27 July 2011 at 03:28

wheelbarrow @ 27/07/2011 03:28:47

Simon66

In: Peterborough
Posts: 846

Hi Firebladejohn, I had no probs of any sort until I went down the M11 at 80 mph with no oil in the sump - seld inflicted really; lol. Up until then it ran like a dream ( no pun intended ).

Message posted by Simon66 on 31 July 2011 at 03:17

Simon66 @ 31/07/2011 03:17:16

Deleted Member

In: NA
Posts: 0

Easiest way to check float level is to attatch a peice of clear tube to the drain nipple under the float bowl then hold it up the side of the carb . To adjust float level you bend the arm that holds it .

Message posted by Deleted Member on 31 July 2011 at 19:12

Deleted Member @ 31/07/2011 19:12:00

firebladejohn

In: darwen
Posts: 437

hi again every1, put brand new plugs and coil on got a very good blue spark on both plugs , but the spark is erratic it dosent stay dead centre of the plugs ..................could it be a bad earth wire on the generater . what could cause this problem ...................cheers

Message posted by firebladejohn on 01 August 2011 at 21:35

firebladejohn @ 01/08/2011 21:35:29

Deleted Member

In: NA
Posts: 0

Have you set the gaps correctly ?

Message posted by Deleted Member on 02 August 2011 at 23:06

Deleted Member @ 02/08/2011 23:06:49

firebladejohn

In: darwen
Posts: 437

brand new pre set spark plugs

Message posted by firebladejohn on 03 August 2011 at 19:27

firebladejohn @ 03/08/2011 19:27:11

Deleted Member

In: NA
Posts: 0

Well its normal for it to move about the electrode a bit .If the spark is strong and constant its good . Think lightning never strikes the same place twice . Ride it for a bit then check the state of the plugs in a week see how they doing . If they are still sooting up it probably a fueling/air issue .

Message posted by Deleted Member on 04 August 2011 at 02:11

Deleted Member @ 04/08/2011 02:11:19

firebladejohn

In: darwen
Posts: 437

hi again every1 , theres no adjustment on the floats they are in good condition ive done the clear tube test the levels are at least a cm to high is there any other way of getting the float levels down

Message posted by firebladejohn on 31 August 2011 at 00:59

firebladejohn @ 31/08/2011 00:59:44

WheelyNealy

In: Near Driffield
Posts: 2751

should be able to bend the arm to wich the neddle sits thats the usual way of adjusting float levels .
if it sooting up then surlely that sugests its running rich
worn jets / needle could corse this
or blocked or badly adjusted air screew back it out half a turn and try that , allso make sure the air filter is clean as that will make it suck more fuel through the carb due to restricted intake flow .
even a blocked exhurst pipe or baffle will cause an engines to run rich so dont just concentrate on the carb check other side of things too !
good luck

Message posted by WheelyNealy on 31 August 2011 at 17:18

WheelyNealy @ 31/08/2011 17:18:12

firebladejohn

In: darwen
Posts: 437

hi every1 the cb 450 runs a lot better with no air filter in , mixture screw backed off and with the choke fully on( the back plates completely shut ) . ............ is it possible for the engine to be down on compression and its not drawing enough fuel through the carbs thus sooting the plugs

Message posted by firebladejohn on 02 October 2011 at 21:49

firebladejohn @ 02/10/2011 21:49:26

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