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sluggish cb500

17 Posts | Latest reply on 03/10/2011 00:34:36 by firebladejohn | Go to original / last post

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

mickyd

In: chester
Posts: 65

hi guys and gals , its me back to pick your brains ... just got a cb 500 on a 97 plate with 23k on the clock , good clean bike but it seems to lack in the performance dept ....??? it revs ok but just does not feel like a 50 or so horse power bike .... any info would be great ...

Message posted by mickyd on 27 September 2011 at 18:14

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mickyd @ 27/09/2011 18:14:42

wheelbarrow

In: Cardigan
Posts: 750

Could be restricted

Message posted by wheelbarrow on 27 September 2011 at 21:35

wheelbarrow @ 27/09/2011 21:35:08

GreasyTony

In: Camberley
Posts: 1325

Have you, or can you give it a compression test Micky? You would be looking for comformity between cylinder readings, with a difference of not more than 10 - 15%. I would expect to see a figure of around 100 - 120 psi after 8 - 10 engine strokes with a figure of around 65 - 80 psi on the first stroke, building up to the higher figure as you continue turning the engine.

Message posted by GreasyTony on 28 September 2011 at 13:15

GreasyTony @ 28/09/2011 13:15:22

mickyd

In: chester
Posts: 65

Hi Guys ,
wheely , is it a carb of job to see if its restricted ?
tony , would not know where to start to do the test ?
it does rev ok but just seems very astmatic ????? am i bein to hard on it ?

Message posted by mickyd on 28 September 2011 at 17:45

mickyd @ 28/09/2011 17:45:38

harry worth

In: west London
Posts: 379

Throw the air filter away and try again, had a cb750 years ago that became sluggish, shop said lob filter over fence I did problem solved.

Message posted by harry worth on 28 September 2011 at 19:35

harry worth @ 28/09/2011 19:35:10

mickyd

In: chester
Posts: 65

hi harry , so is it ok to run it with no filter ?

Message posted by mickyd on 28 September 2011 at 20:11

mickyd @ 28/09/2011 20:11:17

wheelbarrow

In: Cardigan
Posts: 750

Micky it's probably restricted by some washers in the carb inlet pipes, take the pipe off and you can easily see them.

Message posted by wheelbarrow on 28 September 2011 at 20:35

wheelbarrow @ 28/09/2011 20:35:07

mickyd

In: chester
Posts: 65

hi wheely , is it common to find one restricted as far back as 97 ? the previous owner only went up to 70/75 so maybe he did not notice ? mmmmmmmm

Message posted by mickyd on 28 September 2011 at 20:50

mickyd @ 28/09/2011 20:50:26

harry worth

In: west London
Posts: 379

Just back from pub, no filter no problem, just try if ok get new filter, go easiest way first, if its the original filter it will be -ucked.

Message posted by harry worth on 29 September 2011 at 00:19

harry worth @ 29/09/2011 00:19:36

Deleted Member

In: NA
Posts: 0

even if its restricted it should have decent grunt - just will start to run out of breath at top end (around 80) but If I remember correctly the Kawasaki ER-5 had a bit more poke than the CB500.
From riding a friends though who had his before restricting it - it had less grunt and more top end before the kit went on. general service needed? (oil/filter/plugs etc?)

Message posted by Deleted Member on 29 September 2011 at 01:14

Deleted Member @ 29/09/2011 01:14:06

mickyd

In: chester
Posts: 65

Hi guys , just had a look at the service record and its dealer done till 12 k then nothing ? the guy i got it off bought it at 20k and changed the oil and filter , brake pads . so i guess it may need a service ???? thanks for your advice so far ... kev

Message posted by mickyd on 29 September 2011 at 14:27

mickyd @ 29/09/2011 14:27:57

mickyd

In: chester
Posts: 65

hi all , been out on the 500 today and it seems to be running better ????? having said that the engine is still sort of lumpy on acceleration ?? like its got a slight misfire ???

Message posted by mickyd on 01 October 2011 at 21:06

mickyd @ 01/10/2011 21:06:19

Deleted Member

In: NA
Posts: 0

it could be - but it is a parallel twin, probably not as lumpy as a GPZ though but I seem to remember our schools bike being lumpy one

Message posted by Deleted Member on 01 October 2011 at 21:12

Deleted Member @ 01/10/2011 21:12:59

mickyd

In: chester
Posts: 65

hi tcat , mmmm by the sound of things its running normally ? this is my first twin .... so maybe its me ?

Message posted by mickyd on 01 October 2011 at 21:27

mickyd @ 01/10/2011 21:27:09

firebladejohn

In: darwen
Posts: 437

hi mickyd have you checked the spark plugs for sooting up what colour are they after youve been riding the bike for a few miles

Message posted by firebladejohn on 02 October 2011 at 21:24

firebladejohn @ 02/10/2011 21:24:03

mickyd

In: chester
Posts: 65

i will have look ? do you think it could be the plugs john ?

Message posted by mickyd on 02 October 2011 at 23:00

mickyd @ 02/10/2011 23:00:19

firebladejohn

In: darwen
Posts: 437

if the plugs are sooting up it could be carb problems

Message posted by firebladejohn on 03 October 2011 at 00:34

firebladejohn @ 03/10/2011 00:34:36

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