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Technical Motorbike Help

sluggish cb500

sluggish cb500 - Forums [Biker Match]

sluggish cb500 - Forums [Biker Match]

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sluggish cb500

Posts: 17 Pages: 1/1

mickyd
In: chester
Posts: 65
Karma:

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 ...

mickyd @ 27/09/2011 18:14

wheelbarrow
In: Cardigan
Posts: 750
Karma:

Could be restricted

wheelbarrow @ 27/09/2011 21:35

GreasyTony
In: Camberley
Posts: 1325
Karma:

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.

GreasyTony @ 28/09/2011 13:15

mickyd
In: chester
Posts: 65
Karma:

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 ?

mickyd @ 28/09/2011 17:45

harry worth
In: west London
Posts: 379
Karma:

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.

harry worth @ 28/09/2011 19:35

mickyd
In: chester
Posts: 65
Karma:

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

mickyd @ 28/09/2011 20:11

wheelbarrow
In: Cardigan
Posts: 750
Karma:

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

wheelbarrow @ 28/09/2011 20:35

mickyd
In: chester
Posts: 65
Karma:

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

mickyd @ 28/09/2011 20:50

harry worth
In: west London
Posts: 379
Karma:

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.

harry worth @ 29/09/2011 00:19

Deleted Member
In: NA
Posts: 0
Karma:

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?)

Deleted Member @ 29/09/2011 01:14

mickyd
In: chester
Posts: 65
Karma:

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

mickyd @ 29/09/2011 14:27

mickyd
In: chester
Posts: 65
Karma:

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 ???

mickyd @ 01/10/2011 21:06

Deleted Member
In: NA
Posts: 0
Karma:

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

Deleted Member @ 01/10/2011 21:12

mickyd
In: chester
Posts: 65
Karma:

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

mickyd @ 01/10/2011 21:27

firebladejohn
In: darwen
Posts: 437
Karma:

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

firebladejohn @ 02/10/2011 21:24

mickyd
In: chester
Posts: 65
Karma:

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

mickyd @ 02/10/2011 23:00

firebladejohn
In: darwen
Posts: 437
Karma:

if the plugs are sooting up it could be carb problems

firebladejohn @ 03/10/2011 00:34

Posts: 17 Pages: 1/1

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